Mysql tech day_paris_ps_and_sys

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Mysql tech day_paris_ps_and_sys

  1. 1. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 12!1
  2. 2. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 12!2 MySQL Tech Day, Paris Performance Schema & MySQL sys Mark Leith
 Senior Software Development Manager MySQL @ Oracle
  3. 3. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!3 Program Agenda ▪ What is Performance Schema anyway? ▪ Performance Schema Configuration ▪ Profiling General Instance Activity ▪ Profiling Statement Activity ▪ Improvements made to date in MySQL 5.7 ▪ The MySQL SYS Schema ▪ Things still to come
  4. 4. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!4 Know Your Audience ▪ Using 5.1 (yes, still)? ▪ Using 5.5 (but I’ll upgrade soon, honest)? ▪ Using 5.6? ▪ Using … 5.7? ▪ Used Performance Schema? ▪ #monitoringlove ▪ #monitoringhate
  5. 5. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!5 What is Performance Schema anyway?
  6. 6. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!6 What is Performance Schema anyway? ▪ Introduced in MySQL 5.5 ▪ A storage engine, built for recording instrumentation – PERFORMANCE_SCHEMA – Manages fixed buffers in memory with lock free hashes – Real engine, unlike INFORMATION_SCHEMA ▪ A database schema to expose the instrumentation – performance_schema ▪ A set of interfaces in the MySQL Server wrapping calls to trace – i.e. pthread_mutex_lock() -> mysql_mutex_lock()
  7. 7. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!7 What is Performance Schema anyway? ▪ Records latency of events that happen within the server ▪ All latency exposed to picosecond (a trillionth of a second) precision ▪ Though may be tracked at different precisions internally ▪ Also tracks other information as appropriate ▪ Bytes, source position, object metadata, etc.
  8. 8. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!8 Performance Schema in MySQL 5.5 ▪ 17 Tables ▪ 222 Instruments Instrument Event Class File IO wait/io/file/% Mutexes wait/synch/mutex/% Read/Write Locks wait/synch/rwlock/% Conditions wait/synch/cond/%
  9. 9. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!9 Performance Schema in MySQL 5.5
  10. 10. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!10 Performance Schema in MySQL 5.5 ▪ Laid out the framework for instrumentation ▪ Focused early on low level instruments – Prove it could handle load, build from ground up ▪ Not turned on by default, had some overhead issues
  11. 11. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!11 Wait Events mysql> select * from events_waits_history_long where event_name like 'wait/io/table/%'G! *************************** 1. row ***************************! THREAD_ID: 137746! EVENT_ID: 3604! END_EVENT_ID: 3604! EVENT_NAME: wait/io/table/sql/handler! SOURCE: handler.cc:2568! TIMER_START: 17101711846046490! TIMER_END: 17101711857643010! TIMER_WAIT: 11596520! SPINS: NULL! OBJECT_SCHEMA: mem__events! OBJECT_NAME: events! INDEX_NAME: PRIMARY! OBJECT_TYPE: TABLE! OBJECT_INSTANCE_BEGIN: 140246283168288! NESTING_EVENT_ID: 3603! NESTING_EVENT_TYPE: STAGE! OPERATION: fetch! NUMBER_OF_BYTES: NULL! FLAGS: NULL Event Context Event type and origin Timing (~11.5 microseconds) Database object info Object type Whether the event was nested Further info as appropriate
  12. 12. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!12 Performance Schema in MySQL 5.6 ▪ Fixed lots of performance issues ▪ Focused on bringing the instrumentation to the DBA / Developer ▪ Statements / Statement Digests ▪ Execution Stages ▪ Object tracking (table / index IO, table locks) ▪ Network IO ▪ Turned on by default, with a subset of instrumentation disabled
  13. 13. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!13 Performance Schema in MySQL 5.6 ▪ 52 Tables (+35) ▪ 545 Instruments (+323) Instrument Type Event Class Statements statement/% Stages stage/% Table IO wait/io/table/% Table Locks wait/lock/table/% Network IO wait/io/socket/% Idle Timing idle
  14. 14. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!14 Performance Schema in MySQL 5.6
  15. 15. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 12!15 “I really think Performance Schema overhead is reasonable for most workloads. … On my old server I got some 20.2K QPS with Performance Schema Disabled and 19.4 QPS with Performance Schema enabled which is overhead of less than 5%. For most workloads paying 5% to have insight about what is happening with the system is a very fair trade.” ▪ Peter Zaitsev, CEO, Percona http://www.mysqlperformanceblog.com/2014/02/11/performance_schema-vs-slow-query-log/
  16. 16. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!16 Statement & Stage Events (5.6) ! ▪ Statements have two types of event ▪ SQL Statements statement/sql/% ▪ Protocol Commands statement/com/% ▪ Stages are the thread states. Like SHOW PROFILE output, but available across connections ▪ Mostly one form stage/sql/% ▪ Apart from .. stage/mysys/Waiting for table level lock
  17. 17. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!17 Stage Events mysql> select * from events_stages_history limit 2G! *************************** 1. row ***************************! THREAD_ID: 23! EVENT_ID: 18898! END_EVENT_ID: 18898! EVENT_NAME: stage/sql/Master has sent all binlog to slave; waiting for more updates! SOURCE: rpl_binlog_sender.cc:420! TIMER_START: 87465041640516000! TIMER_END: 87465045562629000! TIMER_WAIT: 3922113000! NESTING_EVENT_ID: 10! NESTING_EVENT_TYPE: STATEMENT! *************************** 2. row ***************************! THREAD_ID: 23! EVENT_ID: 18899! END_EVENT_ID: 18900! EVENT_NAME: stage/sql/Sending binlog event to slave! SOURCE: rpl_binlog_sender.cc:432! TIMER_START: 87465045562629000! TIMER_END: 87465045593812000! TIMER_WAIT: 31183000! NESTING_EVENT_ID: 10! NESTING_EVENT_TYPE: STATEMENT
  18. 18. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!18 Statement Events mysql> select * from events_statements_history_long limit 1G! *************************** 1. row ***************************! THREAD_ID: 138683! EVENT_ID: 11268! END_EVENT_ID: 11295! EVENT_NAME: statement/sql/update! SOURCE: socket_connection.cc:94! TIMER_START: 87644080265364000! TIMER_END: 87644080504810000! TIMER_WAIT: 239446000! LOCK_TIME: 63000000! SQL_TEXT: /* mem dbpool.default */ update `mem__inventory`.`Agent` set `hasHostname`=1400665852927, `hasReachable`=1400665852927, `timestamp`=1400665852927, `hasVersion`=1400665852927 where hid=x'FA8FDC4C1BC344A0899DAB320757CDF2'! DIGEST: cc389abfcb093ae95cacfe42ed085191! DIGEST_TEXT: UPDATE `mem__inventory` . `Agent` SET `hasHostname` = ? , `hasReachable` = ? , `timestamp` = ? , `hasVersion` = ? WHERE `hid` = ?! CURRENT_SCHEMA: mem! OBJECT_TYPE: NULL! OBJECT_SCHEMA: NULL! OBJECT_NAME: NULL! OBJECT_INSTANCE_BEGIN: NULL! …………
  19. 19. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!19 Statement Events (cont.) mysql> select * from events_statements_history_long limit 1G! *************************** 1. row ***************************! ……! MYSQL_ERRNO: 0! RETURNED_SQLSTATE: 00000! MESSAGE_TEXT: Rows matched: 1 Changed: 1 Warnings: 0! ERRORS: 0! WARNINGS: 0! ROWS_AFFECTED: 1! ROWS_SENT: 0! ROWS_EXAMINED: 1! CREATED_TMP_DISK_TABLES: 0! CREATED_TMP_TABLES: 0! SELECT_FULL_JOIN: 0! SELECT_FULL_RANGE_JOIN: 0! SELECT_RANGE: 0! SELECT_RANGE_CHECK: 0! SELECT_SCAN: 0! SORT_MERGE_PASSES: 0! SORT_RANGE: 0! SORT_ROWS: 0! SORT_SCAN: 0 NO_INDEX_USED: 0! NO_GOOD_INDEX_USED: 0! NESTING_EVENT_ID: 11248! NESTING_EVENT_TYPE: TRANSACTION! NESTING_EVENT_LEVEL: 0
  20. 20. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!20 Performance Schema Table Types Setup Tables ▪ Used to define certain configuration dynamically ▪ Can perform DML against these tables mysql> select table_name! -> from information_schema.tables! -> where table_schema like 'perf%'! -> and table_name like 'setup%';! +-------------------+! | table_name |! +-------------------+! | setup_actors |! | setup_consumers |! | setup_instruments |! | setup_objects |! | setup_timers |! +-------------------+
  21. 21. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!21 Performance Schema Table Types Raw Data Tables ▪ Expose events, objects, or instances of instruments in a raw manner ▪ Allow seeing a (brief) history of raw event metrics as well +-------------------------------------------+! | table_name |! +-------------------------------------------+! | accounts |! | cond_instances |! | events_stages_current |! | events_stages_history |! | events_stages_history_long |! | events_statements_current |! | events_statements_history |! | events_statements_history_long |! | events_waits_current |! | events_waits_history |! | events_waits_history_long |! | file_instances |! | host_cache |! | hosts |! | mutex_instances |! | performance_timers |! | rwlock_instances |! | session_account_connect_attrs |! | session_connect_attrs |! | socket_instances |! | threads |! | users |! +-------------------------------------------+
  22. 22. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!22 Performance Schema Table Types Summary Tables ▪ Summarise event information over multiple dimensions ▪ Useful for longer term monitoring of activity +------------------------------------------------------+! | table_name |! +------------------------------------------------------+! | events_stages_summary_by_account_by_event_name |! | events_stages_summary_by_host_by_event_name |! | events_stages_summary_by_thread_by_event_name |! | events_stages_summary_by_user_by_event_name |! | events_stages_summary_global_by_event_name |! | events_statements_summary_by_account_by_event_name |! | events_statements_summary_by_digest |! | events_statements_summary_by_host_by_event_name |! | events_statements_summary_by_program |! | events_statements_summary_by_thread_by_event_name |! | events_statements_summary_by_user_by_event_name |! | events_statements_summary_global_by_event_name |! | events_waits_summary_by_account_by_event_name |! | events_waits_summary_by_host_by_event_name |! | events_waits_summary_by_instance |! | events_waits_summary_by_thread_by_event_name |! | events_waits_summary_by_user_by_event_name |! | events_waits_summary_global_by_event_name |! | file_summary_by_event_name |! | file_summary_by_instance |! | objects_summary_global_by_type |! | socket_summary_by_event_name |! | socket_summary_by_instance |! | table_io_waits_summary_by_index_usage |! | table_io_waits_summary_by_table |! | table_lock_waits_summary_by_table |! +------------------------------------------------------+
  23. 23. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!23 Performance Schema Configuration
  24. 24. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!24 Performance Schema Configuration ▪ There are three distinct types of configuration ▪ A way to configure how much memory to allocate for instruments ▪ Set with various system variables in options files, not dynamic ▪ A way to enable/disable instrumentation at startup ▪ Again set with options files, only available as of 5.6 ▪ A way to enable/disable instrumentation dynamically ▪ Set by updating the various setup_% tables dynamically
  25. 25. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!25 Performance Configuration History / Summary Size ▪ Define total rows per type ▪ The %_history_size are per-thread ▪ The %_history_long_size are total rows ▪ Only settable in my.[cnf|ini] mysql> select variable_name,! -> variable_value! -> from information_schema.global_variables! -> where variable_name like 'perf%'! -> and variable_name not like '%instances'! -> and variable_name not like '%classes'! -> order by variable_name;! +--------------------------------------------------------+---------------- | variable_name | variable_value +--------------------------------------------------------+---------------- | PERFORMANCE_SCHEMA | ON | PERFORMANCE_SCHEMA_ACCOUNTS_SIZE | 100 | PERFORMANCE_SCHEMA_DIGESTS_SIZE | 5000 | PERFORMANCE_SCHEMA_EVENTS_STAGES_HISTORY_LONG_SIZE | 1000 | PERFORMANCE_SCHEMA_EVENTS_STAGES_HISTORY_SIZE | 10 | PERFORMANCE_SCHEMA_EVENTS_STATEMENTS_HISTORY_LONG_SIZE | 1000 | PERFORMANCE_SCHEMA_EVENTS_STATEMENTS_HISTORY_SIZE | 10 | PERFORMANCE_SCHEMA_EVENTS_WAITS_HISTORY_LONG_SIZE | 1000 | PERFORMANCE_SCHEMA_EVENTS_WAITS_HISTORY_SIZE | 10 | PERFORMANCE_SCHEMA_HOSTS_SIZE | 100 | PERFORMANCE_SCHEMA_MAX_FILE_HANDLES | 32768 | PERFORMANCE_SCHEMA_MAX_TABLE_HANDLES | 732 | PERFORMANCE_SCHEMA_SESSION_CONNECT_ATTRS_SIZE | 512 | PERFORMANCE_SCHEMA_SETUP_ACTORS_SIZE | 100 | PERFORMANCE_SCHEMA_SETUP_OBJECTS_SIZE | 100 | PERFORMANCE_SCHEMA_USERS_SIZE | 100 +--------------------------------------------------------+----------------
  26. 26. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!26 Performance Configuration Max Classes / Instances ▪ Classes count instrument implementations, i.e: ▪ “wait/io/file/sql/binlog” ▪ Instances are the different runtime instances of those things, i.e: ▪ “/data/logs/binlog.000123” mysql> select variable_name, variable_value! -> from information_schema.global_variables! -> where variable_name like 'perf%classes'! -> or variable_name like 'perf%instances'! -> order by variable_name;! +------------------------------------------------------+----------------+! | variable_name | variable_value |! +------------------------------------------------------+----------------+! | PERFORMANCE_SCHEMA_MAX_COND_CLASSES | 80 |! | PERFORMANCE_SCHEMA_MAX_COND_INSTANCES | 946 |! | PERFORMANCE_SCHEMA_MAX_FILE_CLASSES | 50 |! | PERFORMANCE_SCHEMA_MAX_FILE_INSTANCES | 2170 |! | PERFORMANCE_SCHEMA_MAX_MUTEX_CLASSES | 200 |! | PERFORMANCE_SCHEMA_MAX_MUTEX_INSTANCES | 4586 |! | PERFORMANCE_SCHEMA_MAX_RWLOCK_CLASSES | 40 |! | PERFORMANCE_SCHEMA_MAX_RWLOCK_INSTANCES | 3283 |! | PERFORMANCE_SCHEMA_MAX_SOCKET_CLASSES | 10 |! | PERFORMANCE_SCHEMA_MAX_SOCKET_INSTANCES | 86 |! | PERFORMANCE_SCHEMA_MAX_STAGE_CLASSES | 150 |! | PERFORMANCE_SCHEMA_MAX_STATEMENT_CLASSES | 189 |! | PERFORMANCE_SCHEMA_MAX_TABLE_INSTANCES | 569 |! | PERFORMANCE_SCHEMA_MAX_THREAD_CLASSES | 50 |! | PERFORMANCE_SCHEMA_MAX_THREAD_INSTANCES | 143 |! +------------------------------------------------------+----------------+
  27. 27. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!27 Performance Configuration Max Classes / Instances ▪ Monitor the %_lost status variables opposite to see whether these need tweaking ▪ You will generally not need to modify classes, only when loading new plugins mysql> select variable_name, variable_value! -> from information_schema.global_status! -> where variable_name like 'perf%classes_lost'! -> or variable_name like 'perf%instances_lost'! -> order by variable_name;! +-------------------------------------------+----------------+! | variable_name | variable_value |! +-------------------------------------------+----------------+! | PERFORMANCE_SCHEMA_COND_CLASSES_LOST | 0 |! | PERFORMANCE_SCHEMA_COND_INSTANCES_LOST | 0 |! | PERFORMANCE_SCHEMA_FILE_CLASSES_LOST | 0 |! | PERFORMANCE_SCHEMA_FILE_INSTANCES_LOST | 0 |! | PERFORMANCE_SCHEMA_MUTEX_CLASSES_LOST | 0 |! | PERFORMANCE_SCHEMA_MUTEX_INSTANCES_LOST | 0 |! | PERFORMANCE_SCHEMA_RWLOCK_CLASSES_LOST | 0 |! | PERFORMANCE_SCHEMA_RWLOCK_INSTANCES_LOST | 0 |! | PERFORMANCE_SCHEMA_SOCKET_CLASSES_LOST | 0 |! | PERFORMANCE_SCHEMA_SOCKET_INSTANCES_LOST | 0 |! | PERFORMANCE_SCHEMA_STAGE_CLASSES_LOST | 0 |! | PERFORMANCE_SCHEMA_STATEMENT_CLASSES_LOST | 0 |! | PERFORMANCE_SCHEMA_TABLE_INSTANCES_LOST | 0 |! | PERFORMANCE_SCHEMA_THREAD_CLASSES_LOST | 0 |! | PERFORMANCE_SCHEMA_THREAD_INSTANCES_LOST | 0 |! +-------------------------------------------+----------------+
  28. 28. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!28 Performance Configuration setup_instruments ▪ Turn on/off individual instruments, or whether to just count and not time events ▪ Use UPDATE to modify dynamically mysql> select * from setup_instruments limit 5;! +-------------------------------------------------------+---------+------- | NAME | ENABLED | TIMED +-------------------------------------------------------+---------+------- | wait/synch/mutex/sql/TC_LOG_MMAP::LOCK_tc | NO | NO | wait/synch/mutex/sql/LOCK_des_key_file | NO | NO | wait/synch/mutex/sql/MYSQL_BIN_LOG::LOCK_commit | NO | NO | wait/synch/mutex/sql/MYSQL_BIN_LOG::LOCK_commit_queue | NO | NO | wait/synch/mutex/sql/MYSQL_BIN_LOG::LOCK_done | NO | NO +-------------------------------------------------------+---------+------- 5 rows in set (0.00 sec)! !mysql> update setup_instruments! -> set enabled = 'yes', timed = 'yes'! -> where name like '%MYSQL_BIN_LOG%';! Query OK, 16 rows affected (0.00 sec)! Rows matched: 16 Changed: 16 Warnings: 0! !mysql> select * from setup_instruments limit 5;! +-------------------------------------------------------+---------+------- | NAME | ENABLED | TIMED +-------------------------------------------------------+---------+------- | wait/synch/mutex/sql/TC_LOG_MMAP::LOCK_tc | NO | NO | wait/synch/mutex/sql/LOCK_des_key_file | NO | NO | wait/synch/mutex/sql/MYSQL_BIN_LOG::LOCK_commit | YES | YES | wait/synch/mutex/sql/MYSQL_BIN_LOG::LOCK_commit_queue | YES | YES | wait/synch/mutex/sql/MYSQL_BIN_LOG::LOCK_done | YES | YES +-------------------------------------------------------+---------+-------
  29. 29. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!29 Performance Configuration setup_consumers ▪ Define how much to record, either in history, or summaries (by enabling the %_current for the class of event) mysql> select * from setup_consumers;! +----------------------------------+---------+! | NAME | ENABLED |! +----------------------------------+---------+! | events_stages_current | NO |! | events_stages_history | NO |! | events_stages_history_long | NO |! | events_statements_current | YES |! | events_statements_history | NO |! | events_statements_history_long | NO |! | events_transactions_current | NO |! | events_transactions_history | NO |! | events_transactions_history_long | NO |! | events_waits_current | NO |! | events_waits_history | NO |! | events_waits_history_long | NO |! | global_instrumentation | YES |! | thread_instrumentation | YES |! | statements_digest | YES |! +----------------------------------+---------+
  30. 30. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!30 Performance Schema Consumer Hierarchy
  31. 31. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!31 Performance Configuration setup_objects (5.6) ▪ Define exactly which database objects to monitor ▪ Filters standard databases by default ▪ Allows explicit enable/disable, matches on most specific mysql> select * from setup_objects;! +-------------+--------------------+-------------+---------+-------+! | OBJECT_TYPE | OBJECT_SCHEMA | OBJECT_NAME | ENABLED | TIMED |! +-------------+--------------------+-------------+---------+-------+! | TABLE | mysql | % | NO | NO |! | TABLE | performance_schema | % | NO | NO |! | TABLE | information_schema | % | NO | NO |! | TABLE | % | % | YES | YES |! +-------------+--------------------+-------------+---------+-------+! 4 rows in set (0.00 sec)! !mysql> insert into setup_objects! -> values ('TABLE', 'foo', 'bar', 'no', 'no');! Query OK, 1 row affected (0.01 sec)! !mysql> select * from setup_objects;! +-------------+--------------------+-------------+---------+-------+! | OBJECT_TYPE | OBJECT_SCHEMA | OBJECT_NAME | ENABLED | TIMED |! +-------------+--------------------+-------------+---------+-------+! | TABLE | mysql | % | NO | NO |! | TABLE | performance_schema | % | NO | NO |! | TABLE | information_schema | % | NO | NO |! | TABLE | % | % | YES | YES |! | TABLE | foo | bar | NO | NO |! +-------------+--------------------+-------------+---------+-------+
  32. 32. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!32 Performance Configuration setup_actors (5.6) ▪ Define exactly which users to monitor ▪ By default monitors all connections (% is wildcard) ▪ Modifications only apply to new connections mysql> select * from setup_actors;! +------+------+------+! | HOST | USER | ROLE |! +------+------+------+! | % | % | % |! +------+------+------+! 1 row in set (0.00 sec)! ! mysql> delete from setup_actors;! Query OK, 1 row affected (0.00 sec)! ! mysql> insert into setup_actors! -> values ('%', 'mark', '%');! Query OK, 1 row affected (0.00 sec)! ! mysql> select * from setup_actors;! +------+------+------+! | HOST | USER | ROLE |! +------+------+------+! | % | mark | % |! +------+------+------+! 1 row in set (0.00 sec)
  33. 33. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!33 Performance Schema Options Files Config ▪ As of 5.6, allows altering configuration at start up ▪ Enabling / disabling instrumentation ▪ performance_schema_instrument = ‘instrument_name=value’ ▪ Value = [on|1|true] | [off|0|false] | counted ▪ instrument_name can have wildcards (‘wait/synch/mutex/%=off’) ▪ Enabling / disabling consumers ▪ performance_schema_consumer_consumer_name=value ▪ Value = [on|1|true] | [off|0|false]
  34. 34. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!34 Profiling General Instance Activity
  35. 35. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!35 Profiling Considerations ▪ It is easy to just enable everything, but there are overhead concerns ▪ On busy systems mutexes can be locked millions of times per second ▪ It is best to just pick higher latency event types ▪ Statements, Stages, Table IO, File IO, maybe Network IO ▪ It is good to enable all %_current consumers, and statement history ▪ For concurrency/profiling debugging toggle other instruments on an as needed basis
  36. 36. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!36 Profiling Types ▪ Once you’ve narrowed down what you’re interested in, there are two ways to start monitoring ▪ View raw data in the summary views ▪ Gives you an overall picture of usage on the instance ▪ Snapshot data, and compute deltas over time ▪ Gives you an idea of the rates of change for the events
  37. 37. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!37 Analyzing Global Waits ▪ Some waits can include other waits ▪ Table IO latency may also include some mutex and file IO latency ▪ Wait times include concurrency across all threads ▪ Do not assume you can sum all events in global tables and compare to wall clock times
  38. 38. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!38 Top Waits By Latency mysql> select event_name,! -> count_star as count,! -> sys.format_time(sum_timer_wait) as total_latency,! -> sys.format_time(avg_timer_wait) as avg_latency,! -> sys.format_time(max_timer_wait) as max_latency! -> from events_waits_summary_global_by_event_name! -> where event_name != 'idle'! -> order by sum_timer_wait desc limit 5;! +--------------------------------------+----------+---------------+-------------+-------------+! | event_name | count | total_latency | avg_latency | max_latency |! +--------------------------------------+----------+---------------+-------------+-------------+! | wait/io/table/sql/handler | 21888502 | 1.27h | 208.06 us | 2.21 s |! | wait/io/file/innodb/innodb_data_file | 4276800 | 00:48:12.49 | 676.32 us | 1.49 s |! | wait/io/file/innodb/innodb_log_file | 1948199 | 00:25:24.36 | 782.45 us | 1.30 s |! | wait/io/file/myisam/kfile | 4566406 | 00:13:45.92 | 180.87 us | 1.17 s |! | wait/io/file/myisam/dfile | 1277589 | 00:05:46.23 | 271.01 us | 1.18 s |! +--------------------------------------+----------+---------------+-------------+-------------+
  39. 39. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!39 Analyzing Global Waits ▪ Some mutex events that can affect global concurrency (if high in list): ▪ wait/synch/mutex/innodb/buf_pool_mutex ▪ Increase innodb_buffer_pool_instances ▪ wait/synch/mutex/sql/Query_cache::structure_guard_mutex ▪ Look in to disabling the Query Cache ▪ wait/synch/mutex/myisam/MYISAM_SHARE::intern_lock ▪ Use Innodb …
  40. 40. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!40 Analyzing Global Waits ▪ Some File IO events to watch for (if high in list): ▪ wait/io/file/sql/FRM ▪ Tune table_open_cache / table_definition_cache ▪ wait/io/file/sql/file_parser (view definition parsing) ▪ If high on 5.5, upgrade to 5.6, (which can cache these like tables) ▪ wait/io/file/sql/query_log and wait/io/file/sql/slow_log ▪ Disable the general ▪ Disable or tune what is logged to the slow log (decent long_query_time)
  41. 41. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!41 Top Files By Total IO mysql> select sys.format_path(file_name) as file,! -> count_read,! -> sys.format_bytes(sum_number_of_bytes_read) as total_read,! -> sys.format_bytes(IFNULL(sum_number_of_bytes_read / count_read, 0)) as avg_read,! -> count_write,! -> sys.format_bytes(sum_number_of_bytes_write) as total_written,! -> sys.format_bytes(IFNULL(sum_number_of_bytes_write / count_write, 0)) as avg_write,! -> sys.format_bytes(sum_number_of_bytes_read + sum_number_of_bytes_write) as total,! -> IFNULL(ROUND(100-((sum_number_of_bytes_read/(sum_number_of_bytes_read + sum_number_of_bytes_write))*100), 2), 0.00) as write_pct! -> from file_summary_by_instance! -> order by (sum_number_of_bytes_read + sum_number_of_bytes_write) desc limit 5;! +----------------------------------+------------+------------+-----------+-------------+---------------+-----------+-------------+-----------+ | file | count_read | total_read | avg_read | count_write | total_written | avg_write | total | write_pct | +----------------------------------+------------+------------+-----------+-------------+---------------+-----------+-------------+-----------+ | @@datadir/ibdata1 | 888 | 15.84 MiB | 18.27 KiB | 1089824 | 61.99 GiB | 59.64 KiB | 62.00 GiB | 99.98 | | @@datadir/mem__events/events.ibd | 114 | 1.80 MiB | 16.14 KiB | 117370 | 2.14 GiB | 19.14 KiB | 2.14 GiB | 99.92 | | @@datadir/cerberus-bin.000010 | 296103 | 1.01 GiB | 3.59 KiB | 362852 | 1.00 GiB | 2.89 KiB | 2.01 GiB | 49.63 | | @@datadir/ib_logfile0 | 6 | 68.00 KiB | 11.33 KiB | 506837 | 1.46 GiB | 3.03 KiB | 1.46 GiB | 100.00 | | @@datadir/ib_logfile1 | 0 | 0 bytes | 0 bytes | 476961 | 1.45 GiB | 3.19 KiB | 1.45 GiB | 100.00 | +----------------------------------+------------+------------+-----------+-------------+---------------+-----------+-------------+-----------+ High IO on InnoDB per-tablespace tables can show candidates for a separate mountpoint/disk using “DATA DIRECTORY” in CREATE TABLE
  42. 42. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!42 Analyzing User Activity ▪ All event_% summaries are exposed with a number of dimensions ▪ To analyze connection activity you can do this in 4 ways ▪ By User ▪ By Host ▪ By Account (User@Host) ▪ By Thread ▪ The follow examples are by user, but could be replaced with the host, account or thread summary views
  43. 43. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!43 Top Users By Statement Latency mysql> select user,! -> sum(count_star) as statements,! -> sys.format_time(sum(sum_timer_wait)) as total_latency,! -> sys.format_time(sum(sum_timer_wait) / sum(count_star)) as avg_latency! -> from events_statements_summary_by_user_by_event_name! -> where user is not null! -> group by user! -> order by sum(sum_timer_wait) desc;! +------+------------+---------------+-------------+! | user | statements | total_latency | avg_latency |! +------+------------+---------------+-------------+! | root | 7229032 | 15.17h | 7.55 ms |! | mark | 3072 | 1.77 s | 575.29 us |! +------+------------+---------------+-------------+!
  44. 44. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!44 Top Users By IO Latency mysql> select user, sum(count_star) as count,! -> sys.format_time(sum(sum_timer_wait)) as total_latency! -> from events_waits_summary_by_user_by_event_name! -> where event_name like 'wait/io/file/%'! -> and user is not null! -> group by user! -> order by sum(sum_timer_wait) desc;! +------+----------+---------------+! | user | count | total_latency |! +------+----------+---------------+! | root | 10892980 | 00:46:19.67 |! | mark | 20043 | 346.79 ms |! +------+----------+---------------+! Replace with some other pattern here for “Top user by wait class”
  45. 45. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!45 Top Users By Connections mysql> select * from users where user is not null order by current_connections desc;! +------+---------------------+-------------------+! | USER | CURRENT_CONNECTIONS | TOTAL_CONNECTIONS |! +------+---------------------+-------------------+! | root | 8 | 151655 |! | mark | 1 | 1 |! +------+---------------------+-------------------+! 2 rows in set (0.00 sec)! ! mysql> select * from accounts where user is not null order by current_connections desc;! +------+-----------+---------------------+-------------------+! | USER | HOST | CURRENT_CONNECTIONS | TOTAL_CONNECTIONS |! +------+-----------+---------------------+-------------------+! | root | localhost | 39 | 151698 |! | mark | localhost | 1 | 1 |! +------+-----------+---------------------+-------------------+! 2 rows in set (0.00 sec)
  46. 46. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!46 User Statement Activity mysql> select *! -> from events_statements_summary_by_user_by_event_name! -> where user is not null! -> order by user, sum_timer_wait desc limit 20G! *************************** 1. row ***************************! USER: mark! EVENT_NAME: statement/sql/select! COUNT_STAR: 4! SUM_TIMER_WAIT: 1692883853000! MIN_TIMER_WAIT: 88330000! AVG_TIMER_WAIT: 423220963000! MAX_TIMER_WAIT: 1692583043000! SUM_LOCK_TIME: 408000000! SUM_ERRORS: 0! SUM_WARNINGS: 0! SUM_ROWS_AFFECTED: 0! SUM_ROWS_SENT: 212! SUM_ROWS_EXAMINED: 15067! SUM_CREATED_TMP_DISK_TABLES: 3! SUM_CREATED_TMP_TABLES: 4 SUM_SELECT_FULL_JOIN: 0! SUM_SELECT_FULL_RANGE_JOIN: 0! SUM_SELECT_RANGE: 0! SUM_SELECT_RANGE_CHECK: 0! SUM_SELECT_SCAN: 2! SUM_SORT_MERGE_PASSES: 6! SUM_SORT_RANGE: 0! SUM_SORT_ROWS: 6458! SUM_SORT_SCAN: 2! SUM_NO_INDEX_USED: 1! SUM_NO_GOOD_INDEX_USED: 0 Summarized by statement type, e.g: ! statement/sql/select statement/sql/update
  47. 47. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!47 User Top Stages mysql> select user, event_name as stage,! -> count_star as total,! -> sys.format_time(sum_timer_wait) as total_latency,! -> sys.format_time(avg_timer_wait) as avg_latency,! -> sys.format_time(max_timer_wait) as max_latency! -> from events_stages_summary_by_user_by_event_name! -> where sum_timer_wait > 0! -> order by user, sum_timer_wait desc;! +------+--------------------------------+--------+---------------+-------------+-------------+! | user | stage | total | total_latency | avg_latency | max_latency |! +------+--------------------------------+--------+---------------+-------------+-------------+! | root | stage/sql/starting | 591184 | 00:47:52.47 | 4.86 ms | 3.96 s |! | root | stage/sql/update | 193940 | 00:15:00.84 | 4.64 ms | 4.02 s |! | root | stage/sql/updating | 50334 | 00:01:41.38 | 2.01 ms | 2.35 s |! | root | stage/sql/statistics | 73869 | 00:01:41.38 | 1.37 ms | 4.54 s |! | root | stage/sql/Sending data | 73211 | 00:01:38.31 | 1.34 ms | 1.04 s |! | root | stage/sql/Opening tables | 404230 | 00:01:23.48 | 206.51 us | 473.72 ms |! | root | stage/sql/closing tables | 567351 | 00:01:13.40 | 129.38 us | 79.52 ms |! | root | stage/sql/removing tmp table | 11603 | 56.87 s | 4.90 ms | 964.17 ms |! | root | stage/sql/freeing items | 567520 | 19.75 s | 34.80 us | 219.19 ms |! | root | stage/sql/init | 316805 | 8.26 s | 26.06 us | 217.54 ms |! ………
  48. 48. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!48 Analyzing Table Activity ▪ 3 summary views have been added to 5.6 on top of Table IO ▪ objects_summary_global_by_type ▪ A high level aggregate view of database object latency ▪ table_io_waits_summary_by_table ▪ A detailed aggregate by table, breaking down reads, writes, etc. ▪ table_io_waits_summary_by_index_usage ▪ Further breaking down usage per index
  49. 49. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!49 Top Tables By Latency mysql> select object_schema,! -> object_name,! -> count_star,! -> sys.format_time(sum_timer_wait) as total_latency,! -> sys.format_time(sum_timer_wait / count_star) as avg_latency,! -> sys.format_time(max_timer_wait) as max_latency! -> from objects_summary_global_by_type! -> order by sum_timer_wait desc limit 5;! +------------------+-------------------+------------+---------------+-------------+-------------+! | object_schema | object_name | count_star | total_latency | avg_latency | max_latency |! +------------------+-------------------+------------+---------------+-------------+-------------+! | mem__inventory | mysqlserver | 1049496 | 00:04:48.32 | 274.72 us | 1.50 s |! | mem__events | events | 227939 | 00:01:00.50 | 265.41 us | 2.15 s |! | mem__events | event_chain_heads | 328664 | 50.80 s | 154.57 us | 2.21 s |! | mem__inventory | agent | 442751 | 44.82 s | 101.23 us | 1.69 s |! | mem__instruments | fsstatistics | 2233484 | 16.53 s | 7.40 us | 269.27 ms |! +------------------+-------------------+------------+---------------+-------------+-------------+ Less events, yet higher latency, is a sign that there could be concurrency issues
  50. 50. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!50 Table Usage Detailed Breakdown !mysql> select object_schema, object_name,! -> count_fetch as selects, sys.format_time(sum_timer_fetch) as select_latency,! -> count_insert as inserts, sys.format_time(sum_timer_insert) as insert_latency,! -> count_update as updates, sys.format_time(sum_timer_update) as update_latency,! -> count_delete as deletes, sys.format_time(sum_timer_delete) as delete_latency! -> from table_io_waits_summary_by_table! -> order by sum_timer_wait desc limit 10;! +------------------+-------------------+---------+----------------+---------+----------------+---------+----------------+---------+----------------+! | object_schema | object_name | selects | select_latency | inserts | insert_latency | updates | update_latency | deletes | delete_latency |! +------------------+-------------------+---------+----------------+---------+----------------+---------+----------------+---------+----------------+! | mem__inventory | mysqlserver | 418518 | 00:04:32.21 | 0 | 0 ps | 48534 | 15.51 s | 0 | 0 ps |! | mem__events | events | 58512 | 5.54 s | 2701 | 4.01 s | 52414 | 50.83 s | 0 | 0 ps |! | mem__events | event_chain_heads | 156194 | 6.93 s | 78 | 59.75 ms | 52366 | 43.60 s | 0 | 0 ps |! | mem__inventory | agent | 188113 | 40.06 s | 0 | 0 ps | 6998 | 4.54 s | 0 | 0 ps |! | mem__instruments | fsstatistics | 2222058 | 15.12 s | 1517 | 1.37 s | 1 | 72.69 us | 0 | 0 ps |! | mem__instruments | qrtidata | 2771546 | 2.57 s | 3030 | 12.52 s | 0 | 0 ps | 0 | 0 ps |! | mem__inventory | network | 91187 | 2.24 s | 0 | 0 ps | 11864 | 8.42 s | 0 | 0 ps |! | mem__inventory | os | 79736 | 6.08 s | 0 | 0 ps | 8827 | 4.07 s | 0 | 0 ps |! | mem__inventory | networking | 99114 | 4.24 s | 0 | 0 ps | 5928 | 5.54 s | 0 | 0 ps |! | mem__inventory | environment | 100445 | 5.29 s | 0 | 0 ps | 6540 | 2.53 s | 0 | 0 ps |! +------------------+-------------------+---------+----------------+---------+----------------+---------+----------------+---------+----------------+
  51. 51. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!51 Analyzing Table Activity Tables with full scans ▪ Search in table_io_waits_summary_by_index_usage where index_name is null ▪ This is a catch all row for rows that are read without indexes mysql> select concat(object_schema, '.', object_name) as object,! -> count_read as rows_scanned,! -> sys.format_time(sum_timer_wait) as latency! -> from table_io_waits_summary_by_index_usage! -> where index_name is null! -> and count_read > 0! -> order by sum_timer_wait desc limit 20;! +---------------------------------------+--------------+----------- | object | rows_scanned | latency +---------------------------------------+--------------+----------- | mem__instruments.qrtidata | 2735434 | 14.56 s | mem__instruments.databaseactivitydata | 2735633 | 4.68 s | mem__instruments.diskiototaldata | 31813 | 3.26 s | mem__instruments.connectionsdata | 2530816 | 3.17 s | mem__inventory.agent | 117544 | 2.89 s | mem__instruments.fsstatistics | 738626 | 2.69 s | mem__instruments.diskioopstotaldata | 25955 | 2.43 s | mem__inventory.environment | 42549 | 1.55 s | mem__enterprise.whats_new_entries | 1453 | 1.16 s | mem__inventory.networking | 42549 | 559.14 ms +---------------------------------------+--------------+-----------
  52. 52. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!52 Analyzing Table Activity Unused Indexes ▪ Search in table_io_waits_summary_by_index_usage where count_star = 0 ▪ You should ensure you have representative time frame before taking any actions! mysql> select object_schema,! -> object_name,! -> index_name! -> from table_io_waits_summary_by_index_usage! -> where index_name is not null! -> and count_star = 0! -> order by object_schema, object_name limit 10;! +-------------------+---------------------+------------+! | object_schema | object_name | index_name |! +-------------------+---------------------+------------+! | mem__advisors | advisor_initialized | PRIMARY |! | mem__advisors | advisor_schedules | PRIMARY |! | mem__advisors | app_identity_path | PRIMARY |! | mem__advisor_text | template_meta | PRIMARY |! | mem__bean_config | plists | path |! | mem__bean_config | plists | PRIMARY |! | mem__bean_config | plist_name_values | PRIMARY |! | mem__config | asset_notes | PRIMARY |! | mem__config | group_selections | PRIMARY |! | mem__config | group_selections | name |! +-------------------+---------------------+------------+
  53. 53. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!53 Host Cache Usage and Errors ▪ New host_cache view within 5.6, exposing hosts in the host cache ▪ Counts errors, by the type of error that can occur ▪ Can show when errors started happening ▪ Compare the sum_connect_errors counter to the max_connect_errors system variable
  54. 54. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!54 host_cachemysql> desc host_cache;! +--------------------------------------------+------------------+------+-----+---------------------+-------+! | Field | Type | Null | Key | Default | Extra |! +--------------------------------------------+------------------+------+-----+---------------------+-------+! | IP | varchar(64) | NO | | NULL | |! | HOST | varchar(255) | YES | | NULL | |! | HOST_VALIDATED | enum('YES','NO') | NO | | NULL | |! | SUM_CONNECT_ERRORS | bigint(20) | NO | | NULL | |! | COUNT_HOST_BLOCKED_ERRORS | bigint(20) | NO | | NULL | |! | COUNT_NAMEINFO_TRANSIENT_ERRORS | bigint(20) | NO | | NULL | |! | COUNT_NAMEINFO_PERMANENT_ERRORS | bigint(20) | NO | | NULL | |! | COUNT_FORMAT_ERRORS | bigint(20) | NO | | NULL | |! | COUNT_ADDRINFO_TRANSIENT_ERRORS | bigint(20) | NO | | NULL | |! | COUNT_ADDRINFO_PERMANENT_ERRORS | bigint(20) | NO | | NULL | |! | COUNT_FCRDNS_ERRORS | bigint(20) | NO | | NULL | |! | COUNT_HOST_ACL_ERRORS | bigint(20) | NO | | NULL | |! | COUNT_NO_AUTH_PLUGIN_ERRORS | bigint(20) | NO | | NULL | |! | COUNT_AUTH_PLUGIN_ERRORS | bigint(20) | NO | | NULL | |! | COUNT_HANDSHAKE_ERRORS | bigint(20) | NO | | NULL | |! | COUNT_PROXY_USER_ERRORS | bigint(20) | NO | | NULL | |! | COUNT_PROXY_USER_ACL_ERRORS | bigint(20) | NO | | NULL | |! | COUNT_AUTHENTICATION_ERRORS | bigint(20) | NO | | NULL | |! | COUNT_SSL_ERRORS | bigint(20) | NO | | NULL | |! | COUNT_MAX_USER_CONNECTIONS_ERRORS | bigint(20) | NO | | NULL | |! | COUNT_MAX_USER_CONNECTIONS_PER_HOUR_ERRORS | bigint(20) | NO | | NULL | |! | COUNT_DEFAULT_DATABASE_ERRORS | bigint(20) | NO | | NULL | |! | COUNT_INIT_CONNECT_ERRORS | bigint(20) | NO | | NULL | |! | COUNT_LOCAL_ERRORS | bigint(20) | NO | | NULL | |! | COUNT_UNKNOWN_ERRORS | bigint(20) | NO | | NULL | |! | FIRST_SEEN | timestamp | NO | | 0000-00-00 00:00:00 | |! | LAST_SEEN | timestamp | NO | | 0000-00-00 00:00:00 | |! | FIRST_ERROR_SEEN | timestamp | YES | | 0000-00-00 00:00:00 | |! | LAST_ERROR_SEEN | timestamp | YES | | 0000-00-00 00:00:00 | |
  55. 55. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!55 Computing Rates Of Change ▪ To look at how things change over time, you have a couple of options ▪ Record the events you are interested in within persistent history tables ▪ Get current stats from performance_schema, the last rows of history, compute the time delta and event count deltas, store new deltas along with the raw values ▪ Or use some tool like MySQL Enterprise Monitor ▪ Read the tables regularly, and run TRUNCATE TABLE on them immediately afterwards ▪ Some users have done this by dumping local traces to files on disk, and resetting stats every 15 minutes, for example
  56. 56. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!56 Computing Rates Of Change ▪ For an example, the following event tracks the time spent waiting in the replication SQL thread for new events to be written to the relay log by the IO thread ▪ wait/synch/cond/sql/MYSQL_RELAY_LOG::update_cond ▪ This is essentially the SQL thread idle time, for a single SQL thread, if we snapshot this over time, we can find overall busy time
  57. 57. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!57 Slave SQL Load Average ▪ An example of monitoring this event over time ! http://www.markleith.co.uk/2012/07/24/a-mysql-replication-load-average-with-performance-schema/
  58. 58. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!58 Slave SQL Load Average http://www.markleith.co.uk/2012/07/24/a-mysql-replication-load-average-with-performance-schema/
  59. 59. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!59 Computing Rates Of Change ▪ If interested in calculating percentages, copy the approach shown in the replication load average – you have to take in to account waiting 100% on other events, or just this event, etc. ▪ Note, this method can not be used generally, you have to be able to correlate it to specific thread(s) ▪ As latency is per thread, and you have to compare to a known time delta, summary views do not give this to you (you don’t get thread counts per interval) ▪ Should still compute the deltas for global events however, for event throughput / latency statistics over time !
  60. 60. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!60 Profiling Statement Activity
  61. 61. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!61 Statement Profiling Options ▪ The new instrumentation in 5.6 gives many options ▪ See statements running currently with events_statements_current ▪ Summary views by user, host, account ▪ Statement histories within events_statements_history% tables ▪ A normalized view within events_statements_summary_by_digest
  62. 62. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!62 Currently Executing Statements mysql> select * from events_statements_current where timer_end is nullG! *************************** 8. row ***************************! THREAD_ID: 156945! EVENT_ID: 15312! END_EVENT_ID: NULL! EVENT_NAME: statement/sql/select! SOURCE: socket_connection.cc:94! TIMER_START: 99343994725205000! TIMER_END: NULL! TIMER_WAIT: NULL! LOCK_TIME: 145000000! SQL_TEXT: /* mem dbpool.ui */ select normalized0_.round_robin_bin as round1_1256_, /* ..snip .. */! DIGEST: NULL! DIGEST_TEXT: NULL! CURRENT_SCHEMA: mem! OBJECT_TYPE: NULL! OBJECT_SCHEMA: NULL! OBJECT_NAME: NULL! OBJECT_INSTANCE_BEGIN: NULL! MYSQL_ERRNO: 0! RETURNED_SQLSTATE: NULL! MESSAGE_TEXT: NULL! ERRORS: 0! WARNINGS: 0! ROWS_AFFECTED: 0! ROWS_SENT: 27! ROWS_EXAMINED: 0! CREATED_TMP_DISK_TABLES: 0! CREATED_TMP_TABLES: 0 SELECT_FULL_JOIN: 0! SELECT_FULL_RANGE_JOIN: 0! SELECT_RANGE: 1! SELECT_RANGE_CHECK: 0! SELECT_SCAN: 0! SORT_MERGE_PASSES: 0! SORT_RANGE: 0! SORT_ROWS: 0! SORT_SCAN: 0! NO_INDEX_USED: 0! NO_GOOD_INDEX_USED: 0! NESTING_EVENT_ID: NULL! NESTING_EVENT_TYPE: NULL! NESTING_EVENT_LEVEL: 0 All counters are live, and increment whilst the statements execute
  63. 63. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!63 Per Thread Statement History mysql> select thread_id,! -> sys.format_statement(sql_text) as stmt,! -> sys.format_time(timer_wait) as latency! -> from events_statements_history! -> order by thread_id, event_id;! +-----------+-------------------------------------------------------------------+-----------+! | thread_id | stmt | latency |! +-----------+-------------------------------------------------------------------+-----------+! ...! | 158162 | /* mem dbpool.default */ commit | 5.39 ms |! | 158162 | /* mem dbpool.default */ inser ... currentlyOpen), currentlyOpen) | 1.25 ms |! | 158162 | /* mem dbpool.default */ commit | 9.69 ms |! | 158162 | /* mem dbpool.default */ inser ... , VALUES(lastSeen)), lastSeen) | 259.75 us |! | 158162 | /* mem dbpool.default */ inser ... (bytesTotal), bytesTotal), col | 383.05 us |! | 158162 | /* mem dbpool.default */ commit | 51.41 ms |! | 158162 | /* mem dbpool.default */ inser ... ullScan), rowsReadviaFullScan) | 147.04 ms |! | 158162 | /* mem dbpool.default */ commit | 33.87 ms |! | 158162 | /* mem dbpool.default */ inser ... ALUES(indexUsage), indexUsage) | 1.10 ms |! | 158162 | /* mem dbpool.default */ commit | 14.78 ms |! ...! +-----------+-------------------------------------------------------------------+-----------+! 370 rows in set (0.17 sec) Also has same columns as events_statements_current
  64. 64. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!64 Statement Digests ▪ A new summary view introduced in 5.6 ▪ Aggregates statistics based on normalised statements ▪ Can be used to drill in to your problem statements instead of using the slow query log (with less contention, and no need for post-processing) ▪ Each statement gets an MD5 ‘DIGEST’, that is also available to link in to events_statements_history% etc. for raw per-query statistics
  65. 65. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!65 events_statements_summary_by_digest mysql> desc events_statements_summary_by_digest;! +-----------------------------+---------------------+------+-----+---------------------+-------+! | Field | Type | Null | Key | Default | Extra |! +-----------------------------+---------------------+------+-----+---------------------+-------+! | SCHEMA_NAME | varchar(64) | YES | | NULL | |! | DIGEST | varchar(32) | YES | | NULL | |! | DIGEST_TEXT | longtext | YES | | NULL | |! | COUNT_STAR | bigint(20) unsigned | NO | | NULL | |! | SUM_TIMER_WAIT | bigint(20) unsigned | NO | | NULL | |! | MIN_TIMER_WAIT | bigint(20) unsigned | NO | | NULL | |! | AVG_TIMER_WAIT | bigint(20) unsigned | NO | | NULL | |! | MAX_TIMER_WAIT | bigint(20) unsigned | NO | | NULL | |! | SUM_LOCK_TIME | bigint(20) unsigned | NO | | NULL | |! | SUM_ERRORS | bigint(20) unsigned | NO | | NULL | |! | SUM_WARNINGS | bigint(20) unsigned | NO | | NULL | |! | SUM_ROWS_AFFECTED | bigint(20) unsigned | NO | | NULL | |! | SUM_ROWS_SENT | bigint(20) unsigned | NO | | NULL | |! | SUM_ROWS_EXAMINED | bigint(20) unsigned | NO | | NULL | |! | SUM_CREATED_TMP_DISK_TABLES | bigint(20) unsigned | NO | | NULL | |! | SUM_CREATED_TMP_TABLES | bigint(20) unsigned | NO | | NULL | |! | SUM_SELECT_FULL_JOIN | bigint(20) unsigned | NO | | NULL | |! | SUM_SELECT_FULL_RANGE_JOIN | bigint(20) unsigned | NO | | NULL | |! | SUM_SELECT_RANGE | bigint(20) unsigned | NO | | NULL | |! | SUM_SELECT_RANGE_CHECK | bigint(20) unsigned | NO | | NULL | |! | SUM_SELECT_SCAN | bigint(20) unsigned | NO | | NULL | |! | SUM_SORT_MERGE_PASSES | bigint(20) unsigned | NO | | NULL | |! | SUM_SORT_RANGE | bigint(20) unsigned | NO | | NULL | |! | SUM_SORT_ROWS | bigint(20) unsigned | NO | | NULL | |! | SUM_SORT_SCAN | bigint(20) unsigned | NO | | NULL | |! | SUM_NO_INDEX_USED | bigint(20) unsigned | NO | | NULL | |! | SUM_NO_GOOD_INDEX_USED | bigint(20) unsigned | NO | | NULL | |! | FIRST_SEEN | timestamp | NO | | 0000-00-00 00:00:00 | |! | LAST_SEEN | timestamp | NO | | 0000-00-00 00:00:00 | |
  66. 66. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!66 Statement Normalization ▪ Normalization folds certain constructs of statements ▪ Strip whitespace / comments ▪ Replace literals with ? ▪ “WHERE foo = 1” becomes “WHERE foo = ?” ▪ Fold lists of things ▪ “IN (1,2,3)” becomes “IN (…)” ▪ Fold multi-row inserts ▪ “VALUES (1), (2), (3)” becomes “VALUES (?) /*, … */” !
  67. 67. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!67 Statement Digest Output mysql> select * from events_statements_summary_by_digest order by sum_timer_wait desc limit 5G! ...! *************************** 4. row ***************************! SCHEMA_NAME: mem! DIGEST: 5f41a0036bae4fa1c79339c1c7da3c9e! DIGEST_TEXT: SELECT DISTINCTROW `agent0_` . `hid` AS `hid1239_` ...! COUNT_STAR: 64136! SUM_TIMER_WAIT: 1835031591954000! MIN_TIMER_WAIT: 209280000! AVG_TIMER_WAIT: 28611569000! MAX_TIMER_WAIT: 4050621865000! SUM_LOCK_TIME: 31388434000000! SUM_ERRORS: 0! SUM_WARNINGS: 0! SUM_ROWS_AFFECTED: 0! SUM_ROWS_SENT: 64133! SUM_ROWS_EXAMINED: 187363! SUM_CREATED_TMP_DISK_TABLES: 59624! SUM_CREATED_TMP_TABLES: 59624! SUM_SELECT_FULL_JOIN: 0! SUM_SELECT_FULL_RANGE_JOIN: 0! SUM_SELECT_RANGE: 0! SUM_SELECT_RANGE_CHECK: 0! SUM_SELECT_SCAN: 59625! SUM_SORT_MERGE_PASSES: 0! SUM_SORT_RANGE: 0! SUM_SORT_ROWS: 0! SUM_SORT_SCAN: 0! SUM_NO_INDEX_USED: 59625! SUM_NO_GOOD_INDEX_USED: 0! FIRST_SEEN: 2014-05-20 11:26:54! LAST_SEEN: 2014-05-21 14:50:54
  68. 68. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!68 Statements With Temporary Tables mysql> select sys.format_statement(digest_text) as stmt,! -> count_star as total,! -> sum_created_tmp_tables as in_memory,! -> sum_created_tmp_disk_tables as on_disk,! -> round(sum_created_tmp_tables / count_star) as avg_per_stmt,! -> round((sum_created_tmp_disk_tables/sum_created_tmp_tables) * 100) as to_disk_pct! -> from events_statements_summary_by_digest! -> where sum_created_tmp_tables > 0! -> order by sum_created_tmp_disk_tables desc, sum_created_tmp_tables desc limit 5;! +-------------------------------------------------------------------+-------+-----------+---------+--------------+-------------+! | stmt | total | in_memory | on_disk | avg_per_stmt | to_disk_pct |! +-------------------------------------------------------------------+-------+-----------+---------+--------------+-------------+! | SELECT DISTINCTROW `agent0_` . ... gent` `agent0_` INNER JOIN ... | 64668 | 60116 | 60116 | 1 | 100 |! | SELECT DISTINCTROW `mysqlconne ... conne0_` . `socketPath` AS ... | 5605 | 5604 | 5604 | 1 | 100 |! | SELECT * FROM ( SELECT digest ... ed AS `noIndexUsedCount` , ... | 1431 | 10017 | 4293 | 7 | 43 |! | SELECT `s` . `identityId` , `s ... `subject_id` = `s` . `id` ... | 1406 | 4218 | 2812 | 3 | 67 |! | SELECT plugin_name FROM inform ... atus = ? ORDER BY plugin_name | 1726 | 1726 | 1726 | 1 | 100 |! +-------------------------------------------------------------------+-------+-----------+---------+--------------+-------------+! 5 rows in set (0.01 sec)
  69. 69. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!69 Statements With Full Table Scans mysql> select sys.format_statement(digest_text) as stmt,! -> count_star as total,! -> sum_no_index_used as scan_count,! -> round((sum_no_index_used/count_star) * 100) as scan_pct,! -> sum_rows_examined as rows_scanned! -> from events_statements_summary_by_digest! -> where digest_text like 'select%'! -> and (sum_no_index_used > 0 OR sum_no_good_index_used > 0)! -> order by rows_scanned desc limit 5;! +-------------------------------------------------------------------+-------+------------+----------+--------------+! | stmt | total | scan_count | scan_pct | rows_scanned |! +-------------------------------------------------------------------+-------+------------+----------+--------------+! | SELECT `hid` , TIMESTAMP , `en ... DIV ? AS `slice` , `hid` , ... | 4258 | 4257 | 100 | 31644768 |! | SELECT TIMESTAMP , SUM ( `sele ... by_bucket` GROUP BY TIMESTAMP | 807 | 807 | 100 | 4657959 |! | SELECT TIMESTAMP , SUM ( `opti ... by_bucket` GROUP BY TIMESTAMP | 807 | 807 | 100 | 4656726 |! | SELECT TIMESTAMP , SUM ( `tota ... by_bucket` GROUP BY TIMESTAMP | 807 | 807 | 100 | 4454821 |! | SELECT * FROM ( SELECT digest ... ed AS `noIndexUsedCount` , ... | 1434 | 1434 | 100 | 3874018 |! +-------------------------------------------------------------------+-------+------------+----------+--------------+
  70. 70. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!70 Tracing Individual Statement Activity ▪ By taking all available data within the %_history_long tables, we can build a complete picture of where latency lines within statements ▪ We can link the histories of Statements, Stages and Waits using the event_id and nesting_event_id columns, which define hierarchy ! !
  71. 71. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!71 Tracing Individual Statement Activity
  72. 72. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!72 This means we can graph their relationships!
  73. 73. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!73 Tracing Individual Statement Activity
  74. 74. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!74 Tracing Individual Statement Activity ▪ This is only really effective on development / test systems, production systems with high concurrency / throughput age history very quickly, and turning the %_history_long tables on with all instrumentation on is not recommend generally ▪ Good to disable all other threads, or all actors, and just enable a single thread in development / test environments, to get a full trace ▪ Procedure to dump the graph data is available within the MySQL SYS schema ! !
  75. 75. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!75 Improvements made to date in MySQL 5.7
  76. 76. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 12 Insert Picture Here !76 ▪ Memory Usage ▪ Metadata Locking ▪ Replication Configuration & Status ▪ Prepared Statements ▪ Transactions ▪ Stored Programs
  77. 77. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!77 Improvements made to date in MySQL 5.7 ▪ 75 Tables (+23) ▪ 784 Instruments (+239) Instrument Type Event Class Transactions transaction Memory memory/% Metadata Locks wait/lock/metadata/%
  78. 78. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!78 Improvements made to date in MySQL 5.7
  79. 79. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!79 WL#3249! PERFORMANCE SCHEMA, Instrument memory usage
  80. 80. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 12!80 “Understanding where MySQL can allocate memory can help us to find the cause in most cases. It is not as straightforward as it should be and I’m very hopeful future releases of MySQL, MariaDB or Drizzle bring improvements in this space allowing us to see directly for what purpose memory is allocated and so detect all kinds of memory usage problems easier.” ▪ Peter Zaitsev, CEO, Percona http://www.mysqlperformanceblog.com/2012/03/21/troubleshooting-mysql-memory-usage/
  81. 81. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!81 Instrument memory usage ▪ Added 212 different memory instrumentation types so far ▪ Records current, high and low water marks of allocations ▪ Does not track latency of memory allocation ▪ 5 new tables ▪ memory_summary_by_account_by_event_name ▪ memory_summary_by_host_by_event_name ▪ memory_summary_by_thread_by_event_name ▪ memory_summary_by_user_by_event_name ▪ memory_summary_global_by_event_name
  82. 82. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!82 Instrument memory usage - global summary mysql> SELECT * FROM sys.memory_global_by_current_allocatedG! *************************** 1. row ***************************! event_name: memory/performance_schema/internal_buffers! current_count: 60! current_alloc: 497.00 MiB! current_avg_alloc: 8.28 MiB! high_count: 60! high_alloc: 497.00 MiB! high_avg_alloc: 8.28 MiB! *************************** 2. row ***************************! event_name: memory/mysys/KEY_CACHE! current_count: 3! current_alloc: 8.00 MiB! current_avg_alloc: 2.67 MiB! high_count: 3! high_alloc: 8.00 MiB! high_avg_alloc: 2.67 MiB
  83. 83. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!83 Instrument memory usage - thread summaries mysql> select * from memory_by_thread_by_current_allocatedG! *************************** 1. row ***************************! user: sql/main! current_count: 2407! current_alloc: 10.89 MiB! current_avg_alloc: 4.63 KiB! current_max_alloc: 8.00 MiB! total_allocated: 30.55 MiB! thread_id: 1! *************************** 2. row ***************************! user: mem@localhost! current_count: 1914! current_alloc: 1.50 MiB! current_avg_alloc: 824 bytes! current_max_alloc: 816.67 KiB! total_allocated: 9.25 GiB! thread_id: 4336
  84. 84. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!84 Instrument memory usage - thread details mysql> SELECT event_name,! -> sys.format_bytes(current_number_of_bytes_used) AS current_used! -> FROM performance_schema.memory_summary_by_thread_by_event_name! -> WHERE thread_id = 24! -> ORDER BY current_number_of_bytes_used DESC;! +-----------------------------------------------------+--------------+! | event_name | current_used |! +-----------------------------------------------------+--------------+! | memory/sql/Filesort_buffer::sort_keys | 255.94 KiB |! | memory/sql/sp_head::main_mem_root | 103.64 KiB |! | memory/mysys/IO_CACHE | 64.05 KiB |! | memory/mysys/lf_dynarray | 46.17 KiB |! | memory/mysys/array_buffer | 24.20 KiB |! | memory/sql/thd::main_mem_root | 23.95 KiB |! | memory/sql/String::value | 16.13 KiB |! | memory/sql/TABLE | 9.44 KiB |! | memory/sql/TABLE_SHARE::mem_root | 8.70 KiB |! | memory/myisam/MI_INFO | 7.07 KiB |! | memory/sql/THD::transactions::mem_root | 4.02 KiB |! | memory/myisam/MYISAM_SHARE | 3.29 KiB |! …
  85. 85. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!85 Instrument memory usage - other details ! ▪ Disabled by default ! ! ! ! ▪ Still requires InnoDB instrumentation UPDATE setup_instruments SET enabled = ‘YES’ WHERE name LIKE ‘memory/%’;
  86. 86. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!86 WL#5879! PERFORMANCE SCHEMA, MDL lock instrumentation
  87. 87. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 12!87 “Unfortunately, it’s unlikely that I’ll be able to create a reproducible test case, because there’s no way to actually see what is happening. I hope that a future version of MySQL will include a more comprehensive set of tables for inspecting locks, requests, and waits at all layers of the server.” ▪ Baron Schwartz, CEO, VividCortex http://www.xaprb.com/blog/2012/08/28/debugging-metadata-locking-in-mysql-5-5/
  88. 88. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!88 MDL Lock Instrumentation ▪ Added the wait/lock/metadata/sql/mdl instrument ▪ 2 new tables ▪ metadata_locks ▪ table_handles
  89. 89. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!89 Metadata Locks Table Structure +-----------------------+---------------------+------+-----+---------+-------+! | Field | Type | Null | Key | Default | Extra |! +-----------------------+---------------------+------+-----+---------+-------+! | OBJECT_TYPE | varchar(64) | NO | | NULL | |! | OBJECT_SCHEMA | varchar(64) | YES | | NULL | |! | OBJECT_NAME | varchar(64) | YES | | NULL | |! | OBJECT_INSTANCE_BEGIN | bigint(20) unsigned | NO | | NULL | |! | LOCK_TYPE | varchar(32) | NO | | NULL | |! | LOCK_DURATION | varchar(32) | NO | | NULL | |! | LOCK_STATUS | varchar(32) | NO | | NULL | |! | SOURCE | varchar(64) | YES | | NULL | |! | OWNER_THREAD_ID | bigint(20) unsigned | YES | | NULL | |! | OWNER_EVENT_ID | bigint(20) unsigned | YES | | NULL | |! +-----------------------+---------------------+------+-----+---------+-------+
  90. 90. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!90 MDL Lock Instrumentation ▪ OBJECT_TYPE ▪ GLOBAL, SCHEMA, TABLE, FUNCTION, PROCEDURE, TRIGGER, EVENT, COMMIT ▪ LOCK_TYPE ▪ INTENTION_EXCLUSIVE, SHARED, SHARED_HIGH_PRIO, SHARED_READ, SHARED_WRITE, SHARED_UPGRADABLE, SHARED_NO_WRITE, SHARED_NO_READ_WRITE, EXCLUSIVE ▪ LOCK_DURATION ▪ STATEMENT, TRANSACTION, EXPLICIT ▪ LOCK_STATUS ▪ PENDING, GRANTED, VICTIM, TIMEOUT, KILLED
  91. 91. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!91 Metadata Locks Table Structure mysql> select object_type as scope, object_schema, object_name, lock_type, lock_duration, lock_status! -> from metadata_locks! -> order by object_type = 'global' desc, object_type = 'schema' desc,! -> object_type = 'table' desc, object_type = 'commit' desc;! +--------+--------------------+----------------+---------------------+---------------+-------------+! | scope | object_schema | object_name | lock_type | lock_duration | lock_status |! +--------+--------------------+----------------+---------------------+---------------+-------------+! | GLOBAL | NULL | NULL | SHARED | EXPLICIT | GRANTED |! | GLOBAL | NULL | NULL | INTENTION_EXCLUSIVE | STATEMENT | PENDING |! | GLOBAL | NULL | NULL | INTENTION_EXCLUSIVE | STATEMENT | PENDING |! | GLOBAL | NULL | NULL | INTENTION_EXCLUSIVE | STATEMENT | PENDING |! | GLOBAL | NULL | NULL | INTENTION_EXCLUSIVE | STATEMENT | PENDING |! | GLOBAL | NULL | NULL | INTENTION_EXCLUSIVE | STATEMENT | PENDING |! | GLOBAL | NULL | NULL | INTENTION_EXCLUSIVE | STATEMENT | PENDING |! | GLOBAL | NULL | NULL | INTENTION_EXCLUSIVE | STATEMENT | PENDING |! |! | TABLE | mem__events | action_logs | SHARED_READ | TRANSACTION | GRANTED |! | TABLE | mem__events | events | SHARED_READ | TRANSACTION | GRANTED |! | TABLE | performance_schema | metadata_locks | SHARED_READ | TRANSACTION | GRANTED |! | COMMIT | NULL | NULL | SHARED | EXPLICIT | GRANTED |! +--------+--------------------+----------------+---------------------+---------------+-------------+
  92. 92. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!92 WL#3656! PERFORMANCE SCHEMA table for! SHOW SLAVE STATUS
  93. 93. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!93 Replication Instrumentation ▪ 6 new tables ▪ replication_connection_configuration ▪ replication_connection_status ▪ replication_execute_configuration ▪ replication_execute_status ▪ replication_execute_status_by_coordinator ▪ replication_execute_status_by_worker
  94. 94. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!94 Replication Instrumentation
  95. 95. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!95 Replication Connection Configuration mysql> select * from performance_schema.replication_connection_configurationG *************************** 1. row ***************************! HOST: 127.0.0.1! PORT: 3306! USER: rpl! NETWORK_INTERFACE:! AUTO_POSITION: 1! SSL_ALLOWED: YES! SSL_CA_FILE:! SSL_CA_PATH:! SSL_CERTIFICATE:! SSL_CIPHER:! SSL_KEY:! SSL_VERIFY_SERVER_CERTIFICATE: YES! SSL_CRL_FILE:! SSL_CRL_PATH:! CONNECTION_RETRY_INTERVAL: 40! CONNECTION_RETRY_COUNT: 10
  96. 96. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!96 Replication Connection Status mysql> select * from replication_connection_statusG! *************************** 1. row ***************************! SOURCE_UUID:! THREAD_ID: NULL! SERVICE_STATE: CONNECTING! RECEIVED_TRANSACTION_SET:! LAST_ERROR_NUMBER: 1045! LAST_ERROR_MESSAGE: error connecting to master 'repl@localhost: 5613' - retry-time: 60 retries: 1! LAST_ERROR_TIMESTAMP: 2014-04-02 05:41:20
  97. 97. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!97 Replication Execute Status mysql> select * from replication_execute_status;! +---------------+-----------------+! | SERVICE_STATE | REMAINING_DELAY |! +---------------+-----------------+! | ON | NULL |! +---------------+-----------------+ ▪ Very high level overview of status
  98. 98. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!98 Replication Coordinator Status mysql> select * from replication_execute_status_by_coordinatorG! *************************** 1. row ***************************! THREAD_ID: 1281! SERVICE_STATE: ON! LAST_ERROR_NUMBER: 0! LAST_ERROR_MESSAGE:! LAST_ERROR_TIMESTAMP: 0000-00-00 00:00:00 ▪ Status of Coordinator thread in multi-threaded replication
  99. 99. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!99 Replication Worker Status mysql> select * from replication_execute_status_by_worker;! +-----------+-----------+---------------+-----------------------------------------+-------------------+--------------------+----------------------+! | WORKER_ID | THREAD_ID | SERVICE_STATE | LAST_SEEN_TRANSACTION | LAST_ERROR_NUMBER | LAST_ERROR_MESSAGE | LAST_ERROR_TIMESTAMP |! +-----------+-----------+---------------+-----------------------------------------+-------------------+--------------------+----------------------+! | 1 | 1282 | ON | | 0 | | 0000-00-00 00:00:00 |! | 2 | 1283 | ON | | 0 | | 0000-00-00 00:00:00 |! | 3 | 1284 | ON | | 0 | | 0000-00-00 00:00:00 |! | 4 | 1285 | ON | | 0 | | 0000-00-00 00:00:00 |! | 5 | 1286 | ON | | 0 | | 0000-00-00 00:00:00 |! | 6 | 1287 | ON | | 0 | | 0000-00-00 00:00:00 |! | 7 | 1288 | ON | | 0 | | 0000-00-00 00:00:00 |! | 8 | 1289 | ON | 181f2b36-a0b4-11e3-9ac7-1025863574a7:16 | 0 | | 0000-00-00 00:00:00 |! +-----------+-----------+---------------+-----------------------------------------+-------------------+--------------------+----------------------+ ▪ Status of worker threads within multi-threaded replication
  100. 100. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!100 WL#5768! PERFORMANCE SCHEMA, prepared statements instrumentation
  101. 101. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!101 Prepared Statement Instrumentation ▪ Instrumentation depends on already existing statement instruments ▪ statement/com/prepare, statement/com/execute ▪ statement/sql/prepare_sql, statement/sql/execute_sql ▪ 1 new table ▪ prepared_statements_instances
  102. 102. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!102 Prepared Statement Instances mysql> select * from performance_schema.prepared_statements_instancesG! *************************** 1. row ***************************! OBJECT_INSTANCE_BEGIN: 140198306602144! STATEMENT_ID: 1! STATEMENT_NAME: stmt1! SQL_TEXT: select * from test.t1! OWNER_THREAD_ID: 54003! OWNER_EVENT_ID: 935! OWNER_OBJECT_TYPE: NULL! OWNER_OBJECT_SCHEMA: NULL! OWNER_OBJECT_NAME: NULL! TIMER_PREPARE: 15386274000! COUNT_REPREPARE: 0! COUNT_EXECUTE: 1! SUM_TIMER_EXECUTE: 217699000! MIN_TIMER_EXECUTE: 217699000! AVG_TIMER_EXECUTE: 217699000! MAX_TIMER_EXECUTE: 217699000 SUM_LOCK_TIME: 0! SUM_ERRORS: 0! SUM_WARNINGS: 0! SUM_ROWS_AFFECTED: 0! SUM_ROWS_SENT: 0! SUM_ROWS_EXAMINED: 0! SUM_CREATED_TMP_DISK_TABLES: 0! SUM_CREATED_TMP_TABLES: 0! SUM_SELECT_FULL_JOIN: 0! SUM_SELECT_FULL_RANGE_JOIN: 0! SUM_SELECT_RANGE: 0! SUM_SELECT_RANGE_CHECK: 0! SUM_SELECT_SCAN: 0! SUM_SORT_MERGE_PASSES: 0! SUM_SORT_RANGE: 0! SUM_SORT_ROWS: 0! SUM_SORT_SCAN: 0! SUM_NO_INDEX_USED: 0! SUM_NO_GOOD_INDEX_USED: 0
  103. 103. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!103 WL#5864! PERFORMANCE SCHEMA, instrument TRANSACTIONS
  104. 104. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!104 Transaction Instrumentation ▪ Added the transaction instrument ▪ 8 new tables ▪ events_transactions_current ▪ events_transactions_history ▪ events_transactions_history_long ▪ events_transactions_summary_by_account_by_event_name ▪ events_transactions_summary_by_host_by_event_name ▪ events_transactions_summary_by_thread_by_event_name ▪ events_transactions_summary_by_user_by_event_name ▪ events_transactions_summary_global_by_event_name
  105. 105. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!105 Transaction Instrumentation ▪ Exposes details of transactions in raw or summary views ▪ Show details such as ▪ Transaction latency ▪ Isolation levels ▪ Auto commit ▪ Savepoint info ▪ GTID or transaction IDs ▪ Link transactions to the statements within the transactions
  106. 106. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!106 Current Transaction Details mysql> select * from events_transactions_currentG! *************************** 1. row ***************************! THREAD_ID: 1! EVENT_ID: 23733! END_EVENT_ID: 23742! EVENT_NAME: transaction! STATE: COMMITTED! TRX_ID: 281479898269256! GTID: NULL! XID: NULL! XA_STATE: NULL! SOURCE: handler.cc:1246! TIMER_START: 31140612726000! TIMER_END: 31140647445000! TIMER_WAIT: 34719000 ACCESS_MODE: READ WRITE! ISOLATION_LEVEL: REPEATABLE READ! AUTOCOMMIT: YES! NUMBER_OF_SAVEPOINTS: 0! NUMBER_OF_ROLLBACK_TO_SAVEPOINT: 0! NUMBER_OF_RELEASE_SAVEPOINT: 0! OBJECT_INSTANCE_BEGIN: NULL! NESTING_EVENT_ID: NULL! NESTING_EVENT_TYPE: NULL
  107. 107. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!107 Transaction Summary - per user mysql> select * from events_transactions_summary_by_user_by_event_nameG! *************************** 1. row ***************************! USER: mem! EVENT_NAME: transaction! COUNT_STAR: 400044! SUM_TIMER_WAIT: 21208048458267000! MIN_TIMER_WAIT: 160744000! AVG_TIMER_WAIT: 53014289000! MAX_TIMER_WAIT: 24028520397000! COUNT_READ_WRITE: 400044! SUM_TIMER_READ_WRITE: 21208048458267000! MIN_TIMER_READ_WRITE: 160744000! AVG_TIMER_READ_WRITE: 53014289000! MAX_TIMER_READ_WRITE: 24028520397000! COUNT_READ_ONLY: 0! SUM_TIMER_READ_ONLY: 0! MIN_TIMER_READ_ONLY: 0! AVG_TIMER_READ_ONLY: 0! MAX_TIMER_READ_ONLY: 0
  108. 108. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!108 WL#5766! PERFORMANCE SCHEMA, stored programs instrumentation
  109. 109. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!109 Stored Program Instrumentation ▪ Tracks Stored Procedures, Stored Functions, Triggers and Events ▪ Added 16 new statement/sp/% instruments ▪ Expose the different work flows that stored programs use, such as cursor operations, workflow controls etc. ▪ Integrated in to the normal statement instrumentation ▪ 1 new tables ▪ events_statements_summary_by_program
  110. 110. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!110 Stored Program Summary mysql> select * from events_statements_summary_by_programG! *************************** 1. row ***************************! OBJECT_TYPE: PROCEDURE! OBJECT_SCHEMA: ps_demo! OBJECT_NAME: ps_demo_proc! COUNT_STAR: 1! SUM_TIMER_WAIT: 6970931000! MIN_TIMER_WAIT: 6970931000! AVG_TIMER_WAIT: 6970931000! MAX_TIMER_WAIT: 6970931000! COUNT_STATEMENTS: 5! SUM_STATEMENTS_WAIT: 6802181000! MIN_STATEMENTS_WAIT: 16372000! AVG_STATEMENTS_WAIT: 1360436000! MAX_STATEMENTS_WAIT: 6484366000! SUM_LOCK_TIME: 176401000000! SUM_ERRORS: 0! SUM_WARNINGS: 0! SUM_ROWS_AFFECTED: 1! SUM_ROWS_SENT: 0 SUM_ROWS_EXAMINED: 1! SUM_CREATED_TMP_DISK_TABLES: 0! SUM_CREATED_TMP_TABLES: 0! SUM_SELECT_FULL_JOIN: 0! SUM_SELECT_FULL_RANGE_JOIN: 0! SUM_SELECT_RANGE: 0! SUM_SELECT_RANGE_CHECK: 0! SUM_SELECT_SCAN: 0! SUM_SORT_MERGE_PASSES: 0! SUM_SORT_RANGE: 0! SUM_SORT_ROWS: 0! SUM_SORT_SCAN: 0! SUM_NO_INDEX_USED: 0! SUM_NO_GOOD_INDEX_USED: 0
  111. 111. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!111 Stored Program Instrumentation ▪ Like Transaction instrumentation, stored programs link to the statements within them, or even link to transactions within them, which in turn link to their statements
  112. 112. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!112 Full Hierarchy of New Instrumentation
  113. 113. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 12!113
  114. 114. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 12!114
  115. 115. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 12!115
  116. 116. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 12!116
  117. 117. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 12!117
  118. 118. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 12!118
  119. 119. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 12!119 The MySQL SYS Schema
  120. 120. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!120 MySQL SYS Schema Overview ▪ Originally called “ps_helper” ▪ Started as a collection of views, procedures and functions, designed to make reading raw Performance Schema data easier ▪ Implements many of the common DBA and Developer use cases, including many of those shown already ▪ Now bundled within MySQL Workbench 6.1 ▪ Available on GitHub ▪ https://github.com/MarkLeith/mysql-sys
  121. 121. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!121 Loading MySQL SYS $ git clone https://github.com/MarkLeith/mysql-sys.git /tmp/mysql-sys $ cd /tmp/mysql-sys $ mysql -u user -p < sys_<version>.sql ! <version> can be 56 or 57, for 5.6 and 5.7 respectively
  122. 122. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!122 Loading MySQL SYS ▪ Once loaded creates a new “sys” schema containing all objects mysql> select object_type, count! -> from sys.schema_object_overview! -> where db = 'sys';! +-------------+-------+! | object_type | count |! +-------------+-------+! | PROCEDURE | 16 |! | FUNCTION | 8 |! | VIEW | 71 |! +-------------+-------+
  123. 123. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!123 MySQL SYS Functions ▪ Make the raw data more readable to a human ▪ format_time() / format_bytes() ▪ Compress data for CLI output ▪ format_statement() / format_path() ▪ Extract some data to assist with JOIN in certain cases ▪ extract_[schema|table]_from_file_name() ▪ Other functions ▪ ps_is_account_enabled() / ps_thread_stack()
  124. 124. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!124 MySQL SYS Views ▪ Reference set of views solving various admin use cases ▪ Build upon both Performance Schema and INFORMATION_SCHEMA ▪ Both formatted and raw views are available ▪ All raw views are prefixed with x$ ▪ Allows tooling to poll raw views, but humans to use normal ones
  125. 125. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!125 User Summary Views ▪ High level user overview ▪ Breakdowns of IO usage ▪ Drill in to stages per user ▪ Drill in to statement details per user mysql> show tables like 'user%';! +-----------------------------------+! | Tables_in_sys (user%) |! +-----------------------------------+! | user_summary |! | user_summary_by_file_io |! | user_summary_by_file_io_type |! | user_summary_by_stages |! | user_summary_by_statement_latency |! | user_summary_by_statement_type |! +-----------------------------------+
  126. 126. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!126 User Summary (5.7) mysql> select * from user_summaryG! *************************** 1. row ***************************! user: mark! statements: 3072! statement_latency: 1.77 s! statement_avg_latency: 575.29 us! table_scans: 7! file_ios: 20043! file_io_latency: 346.79 ms! current_connections: 1! total_connections: 1! unique_hosts: 1! current_memory: 515.81 KiB! total_memory_allocated: 30.69 MiB
  127. 127. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!127 User File IO Summary mysql> select * from user_summary_by_file_io_type where user != 'background';! +------+--------------------------------------+---------+-------------+-------------+! | user | event_name | total | latency | max_latency |! +------+--------------------------------------+---------+-------------+-------------+! | mark | wait/io/file/myisam/dfile | 19540 | 215.20 ms | 120.79 ms |! | mark | wait/io/file/myisam/kfile | 501 | 131.58 ms | 57.74 ms |! | mark | wait/io/file/sql/dbopt | 2 | 17.29 us | 9.17 us |! | root | wait/io/file/innodb/innodb_log_file | 2079432 | 00:28:27.62 | 1.30 s |! | root | wait/io/file/myisam/kfile | 5195927 | 00:17:07.33 | 1.17 s |! | root | wait/io/file/myisam/dfile | 1533813 | 00:07:27.59 | 1.18 s |! | root | wait/io/file/sql/binlog | 3517008 | 00:03:07.34 | 1.42 s |! | root | wait/io/file/innodb/innodb_data_file | 20720 | 00:02:37.81 | 492.23 ms |! | root | wait/io/file/sql/FRM | 41412 | 3.17 s | 80.43 ms |! | root | wait/io/file/sql/dbopt | 110993 | 1.23 s | 63.27 ms |! | root | wait/io/file/sql/binlog_index | 80 | 1.16 s | 439.79 ms |! | root | wait/io/file/csv/metadata | 16 | 175.97 ms | 79.53 ms |! | root | wait/io/file/archive/data | 3345 | 18.35 ms | 5.05 ms |! | root | wait/io/file/sql/file_parser | 142 | 5.80 ms | 331.82 us |! | root | wait/io/file/sql/misc | 99 | 760.67 us | 25.19 us |! | root | wait/io/file/csv/data | 6 | 596.99 us | 348.11 us |! +------+--------------------------------------+---------+-------------+-------------+
  128. 128. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!128 User Statement Latency Summary mysql> select * from user_summary_by_statement_latency where user != 'background';! +------+---------+---------------+-------------+--------------+-----------+---------------+---------------+------------+ | user | total | total_latency | max_latency | lock_latency | rows_sent | rows_examined | rows_affected | full_scans | +------+---------+---------------+-------------+--------------+-----------+---------------+---------------+------------+ | root | 8322401 | 19.37h | 00:07:08.11 | 00:40:26.25 | 10110692 | 68391445 | 4198113 | 189531 | | mark | 3072 | 1.77 s | 1.73 s | 1.96 ms | 534 | 15389 | 0 | 7 | +------+---------+---------------+-------------+--------------+-----------+---------------+---------------+------------+
  129. 129. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!129 User Statement Type Summary mysql> select * from user_summary_by_statement_type where user != 'background';! +------+-----------------------+---------+---------------+-------------+--------------+-----------+---------------+---------------+------------+! | user | statement | total | total_latency | max_latency | lock_latency | rows_sent | rows_examined | rows_affected | full_scans |! +------+-----------------------+---------+---------------+-------------+--------------+-----------+---------------+---------------+------------+! | mark | select | 4 | 1.69 s | 1.69 s | 408.00 us | 212 | 15067 | 0 | 1 |! | mark | Field List | 146 | 67.91 ms | 40.02 ms | 1.11 ms | 0 | 0 | 0 | 0 |! | mark | jump_if_not | 2496 | 2.68 ms | 7.07 us | 0 ps | 0 | 0 | 0 | 0 |! | mark | show_tables | 4 | 1.70 ms | 545.41 us | 296.00 us | 292 | 292 | 0 | 4 |! | mark | freturn | 418 | 1.15 ms | 9.29 us | 0 ps | 0 | 0 | 0 | 0 |! | mark | show_databases | 2 | 849.40 us | 431.05 us | 146.00 us | 30 | 30 | 0 | 2 |! | mark | Init DB | 2 | 114.95 us | 59.58 us | 0 ps | 0 | 0 | 0 | 0 |! | root | commit | 2463190 | 13.33h | 12.18 s | 0 ps | 0 | 0 | 0 | 0 |! | root | insert | 2501839 | 3.78h | 6.64 s | 00:31:18.63 | 192 | 0 | 3674716 | 0 |! | root | select | 1119999 | 1.74h | 16.34 s | 00:07:42.99 | 6187336 | 63933992 | 0 | 163913 |! | root | update | 494217 | 00:15:23.09 | 4.83 s | 00:01:05.05 | 126 | 496604 | 495334 | 0 |! | root | Binlog Dump GTID | 1 | 00:06:12.69 | 00:06:12.69 | 0 ps | 0 | 0 | 0 | 0 |! | root | delete | 206176 | 00:01:59.54 | 2.22 s | 6.69 s | 12 | 20201 | 20203 | 0 |! | root | set_option | 1068360 | 00:01:10.73 | 45.37 ms | 0 ps | 0 | 0 | 0 | 0 |! | root | show_engine_status | 2222 | 46.62 s | 4.96 s | 0 ps | 0 | 0 | 0 | 0 |! | root | rollback | 64527 | 26.21 s | 407.15 ms | 0 ps | 0 | 0 | 0 | 0 |! | root | show_variables | 11219 | 12.28 s | 255.00 ms | 1.19 s | 2542172 | 2542172 | 0 | 11219 |! | root | show_binlogs | 1850 | 8.96 s | 1.64 s | 0 ps | 0 | 0 | 0 | 0 |! | root | show_tables | 4250 | 6.86 s | 123.34 ms | 182.80 ms | 5277 | 5277 | 0 | 4250 |! | root | show_status | 5485 | 6.50 s | 242.60 ms | 581.02 ms | 1331264 | 1331264 | 0 | 5485 |!
  130. 130. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!130 IO Summary Views ▪ IO breakdown by thread ▪ Global summaries by file and wait class, by both bytes and latency ▪ Stream of last raw file IO stats mysql> show tables like 'io_%';! +------------------------------+! | Tables_in_sys (io_%) |! +------------------------------+! | io_by_thread_by_latency |! | io_global_by_file_by_bytes |! | io_global_by_file_by_latency |! | io_global_by_wait_by_bytes |! | io_global_by_wait_by_latency |! | latest_file_io |! +------------------------------+
  131. 131. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!131 IO Per Thread Summary mysql> select * from io_by_thread_by_latency;! +---------------------+---------+---------------+-------------+-------------+-------------+-----------+----------------+! | user | total | total_latency | min_latency | avg_latency | max_latency | thread_id | processlist_id |! +---------------------+---------+---------------+-------------+-------------+-------------+-----------+----------------+! | io_write_thread | 1270599 | 00:28:51.42 | 1.46 us | 1.36 ms | 1.39 s | 9 | NULL |! | page_cleaner_thread | 3356577 | 00:21:01.53 | 410.93 ns | 2.08 ms | 1.49 s | 19 | NULL |! | io_write_thread | 338216 | 00:14:31.16 | 1.67 us | 2.58 ms | 1.17 s | 12 | NULL |! | io_log_thread | 47023 | 00:04:06.10 | 3.65 us | 5.23 ms | 538.77 ms | 4 | NULL |! | io_write_thread | 290066 | 00:02:20.99 | 2.78 us | 486.07 us | 703.20 ms | 10 | NULL |! | io_write_thread | 221417 | 00:02:12.64 | 1.85 us | 599.05 us | 773.64 ms | 11 | NULL |! | root@localhost | 587531 | 00:02:03.29 | 444.86 ns | 200.24 us | 372.09 ms | 2515 | 2495 |! | io_read_thread | 5102 | 00:01:09.66 | 12.24 us | 13.65 ms | 281.13 ms | 5 | NULL |! | srv_master_thread | 55199 | 58.11 s | 693.68 ns | 1.40 ms | 504.03 ms | 17 | NULL |! | root@localhost | 1622373 | 41.20 s | 486.33 ns | 25.40 us | 359.49 ms | 23 | 3 |! | io_read_thread | 2401 | 37.27 s | 11.86 us | 15.52 ms | 258.97 ms | 6 | NULL |! | io_read_thread | 2156 | 35.73 s | 12.02 us | 16.57 ms | 284.81 ms | 8 | NULL |! | io_read_thread | 1719 | 29.19 s | 11.37 us | 16.98 ms | 269.93 ms | 7 | NULL |! | srv_purge_thread | 3874 | 12.16 s | 433.55 ns | 3.14 ms | 246.79 ms | 18 | NULL |! | main | 11083 | 3.12 s | 588.12 ns | 547.21 us | 234.02 ms | 1 | NULL |! | root@localhost | 5985 | 1.48 s | 625.82 ns | 1.06 ms | 239.17 ms | 137759 | 137739 |! | root@localhost | 157 | 434.38 ms | 497.64 ns | 8.09 ms | 205.84 ms | 178521 | 178501 |! | mark@localhost | 20043 | 346.79 ms | 418.47 ns | 94.10 us | 120.79 ms | 150606 | 150586 |! | root@localhost | 138 | 204.72 ms | 486.33 ns | 2.68 ms | 86.54 ms | 178524 | 178504 |! | root@localhost | 415 | 126.43 ms | 471.25 ns | 195.15 us | 37.21 ms | 178269 | 178249 |! | root@localhost | 9 | 106.21 ms | 6.40 us | 8.85 ms | 103.88 ms | 178522 | 178502 |! +---------------------+---------+---------------+-------------+-------------+-------------+-----------+----------------+! 21 rows in set (0.02 sec)
  132. 132. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!132 IO Per File Summaries mysql> select * from io_global_by_file_by_latency limit 1G! *************************** 1. row ***************************! file: @@datadir/ibdata1! total: 1395714! total_latency: 00:28:53.06! count_read: 1006! read_latency: 4.51 s! count_write: 1326529! write_latency: 33.39 s! count_misc: 68179! misc_latency: 00:28:15.16! ! mysql> select * from io_global_by_file_by_bytes limit 1G! *************************** 1. row ***************************! file: @@datadir/ibdata1! count_read: 1006! total_read: 17.69 MiB! avg_read: 18.00 KiB! count_write: 1327221! total_written: 77.82 GiB! avg_write: 61.48 KiB! total: 77.84 GiB! write_pct: 99.98
  133. 133. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!133 Latest File IO mysql> select * from latest_file_io;! +-----------------------------+----------------------------------+-----------+-----------+-----------+! | thread | file | latency | operation | requested |! +-----------------------------+----------------------------------+-----------+-----------+-----------+! | root@localhost:63153:179371 | @@datadir/ib_logfile1 | 7.16 us | lock | NULL |! | root@localhost:63153:179371 | @@datadir/ib_logfile1 | 6.16 us | write | 1.50 KiB |! | root@localhost:63153:179371 | @@datadir/ib_logfile1 | 14.36 ms | sync | NULL |! | root@localhost:63153:179371 | @@datadir/cerberus-bin.000012 | 28.25 us | write | 905 bytes |! | root@localhost:63177:179394 | @@datadir/ib_logfile1 | 15.25 us | write | 1.00 KiB |! | root@localhost:57487:3 | @@datadir/cerberus-bin.000012 | 32.12 us | read | 905 bytes |! | root@localhost:63177:179394 | @@datadir/ib_logfile1 | 6.65 us | write | 1.00 KiB |! | root@localhost:63177:179394 | @@datadir/ib_logfile1 | 213.32 us | sync | NULL |! | root@localhost:63177:179394 | @@datadir/ib_logfile1 | 17.27 us | write | 1.00 KiB |! | root@localhost:63177:179394 | @@datadir/ib_logfile1 | 286.01 us | sync | NULL |! | root@localhost:63177:179394 | @@datadir/cerberus-bin.000012 | 18.77 us | write | 601 bytes |! | root@localhost:57487:3 | @@datadir/cerberus-bin.000012 | 7.55 us | read | 601 bytes |! | root@localhost:63177:179394 | @@datadir/ib_logfile1 | 10.67 us | write | 1.00 KiB |! | root@localhost:63177:179394 | @@datadir/ib_logfile1 | 200.28 us | sync | NULL |! | root@localhost:63177:179394 | @@datadir/cerberus-bin.000012 | 12.91 us | write | 601 bytes |! | root@localhost:57487:3 | @@datadir/cerberus-bin.000012 | 6.47 us | read | 601 bytes |! | root@localhost:63177:179394 | @@datadir/ib_logfile1 | 9.22 us | write | 1.50 KiB |! ……
  134. 134. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!134 Schema Analysis Views ▪ Object overview ▪ Table usage stats ▪ Index usage stats mysql> show tables like 'schema%';! +-------------------------------------+! | Tables_in_sys (schema%) |! +-------------------------------------+! | schema_index_statistics |! | schema_object_overview |! | schema_table_statistics |! | schema_table_statistics_with_buffer |! | schema_tables_with_full_table_scans |! | schema_unused_indexes |! +-------------------------------------+
  135. 135. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!135 Schema Object Overview mysql> select * from schema_object_overview;! +-------------------------+---------------+-------+! | db | object_type | count |! +-------------------------+---------------+-------+! | information_schema | SYSTEM VIEW | 60 |! | mem__advisors | BASE TABLE | 3 |! | mem__advisors | INDEX (BTREE) | 5 |! | mem__advisor_text | BASE TABLE | 2 |! | mem__advisor_text | INDEX (BTREE) | 5 |! | mem__bean_config | BASE TABLE | 4 |! | mem__bean_config | INDEX (BTREE) | 6 |! | mem__config | BASE TABLE | 12 |! | mem__config | INDEX (BTREE) | 21 |! | mem__enterprise | BASE TABLE | 2 |! | mem__enterprise | INDEX (BTREE) | 3 |! | mem__events | BASE TABLE | 32 |! | mem__events | INDEX (BTREE) | 69 |! | mem__instruments | BASE TABLE | 117 |! | mem__instruments | INDEX (BTREE) | 582 |
  136. 136. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!136 Table statistics mysql> select * from schema_table_statistics limit 1G! *************************** 1. row ***************************! table_schema: mem__quan! table_name: normalized_statements_by_server_by_schema_data! total_latency: 00:55:07.80! rows_fetched: 239685! fetch_latency: 17.10 s! rows_inserted: 1102895! insert_latency: 00:52:18.10! rows_updated: 55910! update_latency: 00:02:28.62! rows_deleted: 17899! delete_latency: 3.98 s! io_read_requests: 20639! io_read: 324.94 MiB! io_read_latency: 00:03:04.10! io_write_requests: 1965973! io_write: 40.36 GiB! io_write_latency: 25.46 s! io_misc_requests: 18217! io_misc_latency: 00:14:06.02
  137. 137. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!137 Index statistics mysql> select * from schema_index_statistics limit 1G! *************************** 1. row ***************************! table_schema: mem__inventory! table_name: mysqlconnectionconfiguration! index_name: PRIMARY! rows_selected: 131399! select_latency: 00:07:05.03! rows_inserted: 0! insert_latency: 0 ps! rows_updated: 41608! update_latency: 21.96 s! rows_deleted: 0! delete_latency: 0 ps
  138. 138. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!138 InnoDB Buffer Usage Views ▪ Buffer usage by schema ▪ Buffer usage by table mysql> show tables like 'innodb%';! +-------------------------------+! | Tables_in_sys (innodb%) |! +-------------------------------+! | innodb_buffer_stats_by_schema |! | innodb_buffer_stats_by_table |! +-------------------------------+
  139. 139. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!139 Buffer Usage By Schema mysql> select * from innodb_buffer_stats_by_schema;! +------------------+------------+------------+-------+--------------+-----------+-------------+! | object_schema | allocated | data | pages | pages_hashed | pages_old | rows_cached |! +------------------+------------+------------+-------+--------------+-----------+-------------+! | mem__quan | 69.94 MiB | 45.39 MiB | 4476 | 4476 | 4476 | 123226 |! | mem__instruments | 20.70 MiB | 10.75 MiB | 1325 | 1325 | 1325 | 82812 |! | mem__events | 3.08 MiB | 2.09 MiB | 197 | 197 | 197 | 3411 |! | mem__inventory | 1.34 MiB | 52.49 KiB | 86 | 86 | 86 | 18 |! | mysql | 432.00 KiB | 251.34 KiB | 27 | 27 | 27 | 2252 |! | mem__config | 144.00 KiB | 3.86 KiB | 9 | 9 | 9 | 29 |! +------------------+------------+------------+-------+--------------+-----------+-------------+
  140. 140. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!140 Buffer Usage By Table mysql> select * from innodb_buffer_stats_by_table limit 20;! +------------------+------------------------------------------------+------------+------------+-------+--------------+-----------+-------------+! | object_schema | object_name | allocated | data | pages | pages_hashed | pages_old | rows_cached |! +------------------+------------------------------------------------+------------+------------+-------+--------------+-----------+-------------+! | mem__quan | normalized_statements_by_server_by_schema_data | 49.97 MiB | 33.12 MiB | 3198 | 3198 | 3198 | 238845 |! | mem__quan | example_statements | 15.95 MiB | 9.71 MiB | 1021 | 1021 | 1021 | 32435 |! | mem__events | events | 2.75 MiB | 1.97 MiB | 176 | 176 | 176 | 5044 |! | mem__quan | normalized_statements | 2.19 MiB | 1.42 MiB | 140 | 140 | 140 | 2297 |! | mem__quan | normalized_statements_by_server_by_schema | 1.06 MiB | 693.58 KiB | 68 | 68 | 68 | 3840 |! | mem__instruments | innodbundologsdata | 1.05 MiB | 754.07 KiB | 67 | 67 | 67 | 5529 |! | mem__instruments | fsstatistics | 736.00 KiB | 603.64 KiB | 46 | 46 | 46 | 2092 |! | mem__instruments | networktrafficadvisor_networktraffic | 496.00 KiB | 291.38 KiB | 31 | 31 | 31 | 1160 |! | mysql | innodb_index_stats | 384.00 KiB | 230.37 KiB | 24 | 24 | 24 | 1986 |! | mem__quan | explains | 368.00 KiB | 274.42 KiB | 23 | 23 | 23 | 333 |! | mem__instruments | innodbchangebufferusagedata | 272.00 KiB | 126.94 KiB | 17 | 17 | 17 | 1104 |! | mem__instruments | rowscanratiodata | 272.00 KiB | 141.18 KiB | 17 | 17 | 17 | 1207 |! | mem__instruments | connectionsmaxdata | 256.00 KiB | 150.98 KiB | 16 | 16 | 16 | 1262 |! | mem__instruments | innodbopenfilesdata | 256.00 KiB | 145.30 KiB | 16 | 16 | 16 | 1170 |! | mem__instruments | myisamkeybufferusagedata | 256.00 KiB | 155.60 KiB | 16 | 16 | 16 | 1192 |! | mem__instruments | connectionsdata | 240.00 KiB | 129.12 KiB | 15 | 15 | 15 | 1106 |! | mem__instruments | diskioopstotaldata | 240.00 KiB | 143.94 KiB | 15 | 15 | 15 | 533 |! | mem__instruments | diskiototaldata | 240.00 KiB | 143.94 KiB | 15 | 15 | 15 | 533 |! | mem__instruments | innodbchangebufferactivitydata | 240.00 KiB | 124.43 KiB | 15 | 15 | 15 | 1003 |! | mem__instruments | innodbcheckpointagedata | 240.00 KiB | 122.65 KiB | 15 | 15 | 15 | 1052 |! +------------------+------------------------------------------------+------------+------------+-------+--------------+-----------+-------------+
  141. 141. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!141 Statement Analysis Views ▪ Statement overview ▪ Find statements by errors, full scans, sorting, temporary tables ▪ Find the statements with the longest runtimes ! mysql> show tables like 'statement%';! +---------------------------------------------+! | Tables_in_sys (statement%) |! +---------------------------------------------+! | statement_analysis |! | statements_with_errors_or_warnings |! | statements_with_full_table_scans |! | statements_with_runtimes_in_95th_percentile |! | statements_with_sorting |! | statements_with_temp_tables |! +---------------------------------------------+
  142. 142. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!142 Statement Analysis mysql> select * from statement_analysis limit 11G! *************************** 1. row ***************************! query: INSERT INTO `mem__quan` . `nor ... nDuration` = IF ( VALUES ( ...! db: mem! full_scan:! exec_count: 1110067! err_count: 0! warn_count: 0! total_latency: 1.93h! max_latency: 5.03 s! avg_latency: 6.27 ms! lock_latency: 00:18:29.18! rows_sent: 0! rows_sent_avg: 0! rows_examined: 0! rows_examined_avg: 0! tmp_tables: 0! tmp_disk_tables: 0! rows_sorted: 0! sort_merge_passes: 0! digest: d48316a218e95b1b8b72db5e6b177788! first_seen: 2014-05-20 10:42:17
  143. 143. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!143 Statement With Errors And Warnings mysql> select * from statements_with_errors_or_warnings limit 1G! *************************** 1. row ***************************! query: CREATE TEMPORARY TABLE IF NOT ... _logs` ( `id` INT8 NOT NULL )! db: mem! exec_count: 1725! errors: 1725! error_pct: 100.0000! warnings: 0! warning_pct: 0.0000! first_seen: 2014-05-20 10:42:32! last_seen: 2014-05-21 18:39:22! digest: 51fb979dbc3910a6294c7cdabd7839c3
  144. 144. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!144 Statement With Sorting mysql> select * from statements_with_sorting limit 1G! *************************** 1. row ***************************! query: SELECT `s` . `identityId` , `s ... `subject_id` = `s` . `id` ...! db: mem! exec_count: 1406! total_latency: 00:03:01.22! sort_merge_passes: 0! avg_sort_merges: 0! sorts_using_scans: 1406! sort_using_range: 1406! rows_sorted: 39865! avg_rows_sorted: 28! first_seen: 2014-05-20 10:42:08! last_seen: 2014-05-21 14:04:02! digest: 9972d1d2cc12b92fe938ec5bd74d2f1d
  145. 145. Copyright © 2014, Oracle and/or its affiliates. All rights reserved.!145 Wait Analysis Views ▪ Wait summaries by class and per instrument globally ▪ Wait details per user ! mysql> show tables like 'wait%';! +------------------------------------+! | Tables_in_sys (wait%) |! +------------------------------------+! | wait_classes_global_by_avg_latency |! | wait_classes_global_by_latency |! | waits_by_user_by_latency |! | waits_global_by_latency |! +------------------------------------+
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