An Overview to MySQL SYS Schema

An
Overview
to

MySQL
SYS
Schema
By

MySQL
Consulting

Team

About
MyDBOPS

• 

MySQL
Consulting

• 

MySQL
Support

• 

Remote
DBA
support.

• 

Expert
MySQL
solutions

• 

MariaDB,
Percona,
Galera,
TokuDB
are

supported
too.

Agenda

• 

Introduction

• 

Installation

• 

Summary
Views

Introduction

Ø 

Improvement
over
PS_helper

Ø 
MySQL
5.7.7
and
higher
includes
the
sys
schema
by
default

Ø 

Set
of
objects
that
helps
DBAs
and
developers
interpret
data
collected
by
the

Performance
Schema
and
other
internals.

Ø 

sys
schema
objects
can
be
used
for
typical
tuning
and
diagnosis
use
cases.

Ø 

Ease
up
the
DBA’s
task
in
understanding
the
internals.

.

Introduction

Ø 

Mark
Leith
is
the
Major
Contributor.

Ø 
Similar
to
Oracle
V$
and
X$
views
that
helps
DBA’s.

§ 

Views
that
summarize
Performance
Schema
data
into
more
easily
understandable

form.

§ 

Stored
procedures
that
perform
operaNons
such
as
Performance
Schema

conﬁguraNon
and
generaNng
diagnosNc
reports.

§ 

Stored
funcNons
that
query
Performance
Schema
conﬁguraNon
and
provide

formaQng
services

§ 
FormaQng
and
helper
funcNons.

Installation

Ø  The
sys
schema
requires
MySQL
5.5
or
higher.

Ø  Can
be
installed
through
Workbench.

Ø  Else
need
to
download
sys_56.sql
or
sys_57.sql
(depends
if
you
use
5.6
or
5.7).just

import
the
sql
ﬁle
as
usual

Install

$
git
clone
hXps://github.com/MarkLeith/mysql-‐sys.git
/tmp/sys

cd
/tmp/sys

Link
to
download:

hXps://github.com/mysql/mysql-‐sys/archive/master.zip

Installation

To
install
:

mysql
-‐u
root
-‐p
<
sys_56.sql

Ø  ValidaNng
sys
schema
a]er
loading

mysql>
select
*
from
sys.version;

+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+

|
sys_version
|
mysql_version

|

+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+

|
1.5.0

|
5.6.27-‐76.0-‐log
|

+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+

mysql>
select
*
from
sys.schema_object_overview
where
db='sys';

+-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐+

|
db

|
object_type

|
count
|

+-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐+

|
sys
|
VIEW

|

87
|

|
sys
|
BASE
TABLE

|

1
|

|
sys
|
INDEX
(BTREE)
|

1
|

|
sys
|
TRIGGER

|

2
|

|
sys
|
FUNCTION

|

20
|

|
sys
|
PROCEDURE

|

26
|

+-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐+

Installation

host_summary

host_summary_by_file_io

host_summary_by_file_io_type

host_summary_by_stages

host_summary_by_statement_latency

host_summary_by_statement_type

innodb_buffer_stats_by_schema

innodb_buffer_stats_by_table

innodb_lock_waits

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

metrics

processlist

ps_check_lost_instrumentation

schema_auto_increment_columns

schema_index_statistics

schema_object_overview

schema_redundant_indexes

schema_table_statistics

schema_table_statistics_with_buffer

schema_tables_with_full_table_scans

schema_unused_indexes

session

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

sys_config

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

version

wait_classes_global_by_avg_latency

wait_classes_global_by_latency

waits_by_host_by_latency

Installation

waits_by_user_by_latency

waits_global_by_latency

x$host_summary

x$host_summary_by_file_io

x$host_summary_by_file_io_type

x$host_summary_by_stages

x$host_summary_by_statement_latency

x$host_summary_by_statement_type

x$innodb_buffer_stats_by_schema

x$innodb_buffer_stats_by_table

x$innodb_lock_waits

x$io_by_thread_by_latency

x$io_global_by_file_by_bytes

x$io_global_by_file_by_latency

x$io_global_by_wait_by_bytes

x$io_global_by_wait_by_latency

x$latest_file_io

x$processlist

x$ps_digest_95th_percentile_by_avg_us

x$ps_digest_avg_latency_distribution

x$ps_schema_table_statistics_io

x$schema_flattened_keys

x$schema_index_statistics

x$schema_table_statistics

x$schema_table_statistics_with_buffer

x$schema_tables_with_full_table_scans

x$session

x$statement_analysis

x$statements_with_errors_or_warnings

x$statements_with_full_table_scans

x$statements_with_runtimes_in_95th_percentile

x$statements_with_sorting

x$statements_with_temp_tables

x$user_summary

x$user_summary_by_file_io

x$user_summary_by_file_io_type

x$user_summary_by_stages

x$user_summary_by_statement_latency

x$user_summary_by_statement_type

x$wait_classes_global_by_avg_latency

x$wait_classes_global_by_latency

x$waits_by_host_by_latency

x$waits_by_user_by_latency

x$waits_global_by_latency

Summary
Views

Ø 
Contains
many
views
that
summarize
Performance
Schema
tables
in
various

ways.

Display
all
running
and
acNve
real
Nme
process.

Ø 
Most
of
these
views
come
in
pairs,
such
that
one
member
of
the
pair
has
the

same
name
as
the
other
member,
plus
a
x$
preﬁx.

For
Ex:

mysql>
SELECT
*
FROM
host_summary_by_file_io;

+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+

|
host

|
ios

|
io_latency
|

+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+

|
localhost

|
67570
|
5.38
s

|

|
background
|

3468
|
4.18
s

|

+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+

mysql>
SELECT
*
FROM
x$host_summary_by_file_io;

+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+

|
host

|
ios

|
io_latency

|

+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+

|
localhost

|
67574
|
5380678125144
|

|
background
|

3474
|
4758696829416
|

+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+

Summary
Views

Resource
Consuming
user

mysql>
select
*
from
user_summaryG

***************************
1.
row
***************************

user:
root

statements:
3185

statement_latency:
2.67
h

statement_avg_latency:
3.02
s

table_scans:
190

file_ios:
548019

file_io_latency:
15.58
m

current_connections:
3

total_connections:
6

unique_hosts:
1

current_memory:
0
bytes

total_memory_allocated:
0
bytes

***************************
2.
row
***************************

Summary
Views

Internal
File
IO
ConsumpNon

mysql>
select
*
from
user_summary_by_file_io_type
where
user
=
'root';

+-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+

|
user
|
event_name

|
total

|
latency

|
max_latency
|

+-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+

|
root
|
wait/io/file/innodb/innodb_data_file
|
538430
|
13.57
m

|
1.11
s

|

|
root
|
wait/io/file/innodb/innodb_log_file

|

3608
|
2.05
m

|
512.93
ms

|

|
root
|
wait/io/file/sql/FRM

|

10579
|
7.95
s

|
315.66
ms

|

|
root
|
wait/io/file/myisam/dfile

|

69
|
361.88
ms
|
287.33
ms

|

|
root
|
wait/io/file/sql/io_cache

|

487
|
67.34
ms

|
39.98
ms

|

|
root
|
wait/io/file/sql/file_parser

|

204
|
16.90
ms

|
14.78
ms

|

|
root
|
wait/io/file/archive/data

|

256
|
853.56
us
|
13.89
us

|

|
root
|
wait/io/file/sql/dbopt

|

33
|
564.94
us
|
67.70
us

|

|
root
|
wait/io/file/myisam/kfile

|

85
|
304.53
us
|
74.57
us

|

|
root
|
wait/io/file/sql/misc

|

7
|
145.62
us
|
33.73
us

|

+-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+

Summary
Views

Resource
ConsumpNon
based
on
Statements

mysql>
select
*
from
user_summary_by_statement_type
where
user
=
'root';

+-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+

|
user
|
statement

|
total
|
total_latency
|
max_latency
|
lock_latency
|
rows_sent
|
rows_examined
|
rows_affected
|
full_scans
|

+-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+

|
root
|
insert

|

1232
|
2.69
h

|
19.52
s

|
0
ps

|

0
|

0
|

10367218
|

0
|

|
root
|
create_table

|

128
|
1.04
m

|
4.41
s

|
0
ps

|

0
|

0
|

0
|

0
|

|
root
|
drop_table

|

150
|
31.18
s

|
2.74
s

|
0
ps

|

0
|

0
|

0
|

0
|

|
root
|
select

|

101
|
9.38
s

|
889.77
ms

|
1.14
s

|

44807
|

65631
|

0
|

45
|

|
root
|
Field
List

|

134
|
6.21
s

|
1.15
s

|
1.49
s

|

0
|

0
|

0
|

0
|

|
root
|
unlock_tables

|

128
|
1.85
s

|
149.67
ms

|
0
ps

|

0
|

0
|

0
|

0
|

|
root
|
show_tables

|

7
|
779.85
ms

|
414.56
ms

|
701.33
ms

|

345
|

345
|

0
|

7
|

|
root
|
error

|

1
|
748.68
ms

|
748.68
ms

|
0
ps

|

0
|

0
|

0
|

0
|

|
root
|
show_databases

|

8
|
703.16
ms

|
644.97
ms

|
585.93
ms

|

75
|

75
|

0
|

8
|

|
root
|
show_variables

|

2
|
389.08
ms

|
388.09
ms

|
45.45
ms

|

1
|

1008
|

0
|

2
|

|
root
|
show_processlist

|

80
|
334.39
ms

|
236.12
ms

|
0
ps

|

0
|

0
|

0
|

0
|

|
root
|
set_option

|

586
|
224.78
ms

|
190.99
ms

|
205.00
us

|

0
|

0
|

0
|

0
|

|
root
|
show_create_table
|

34
|
116.54
ms

|
108.95
ms

|
0
ps

|

0
|

0
|

0
|

0
|

|
root
|
lock_tables

|

129
|
73.91
ms

|
10.81
ms

|
70.90
ms

|

0
|

0
|

0
|

0
|

|
root
|
alter_table

|

255
|
36.52
ms

|
6.93
ms

|
0
ps

|

0
|

0
|

0
|

0
|

|
root
|
change_db

|

33
|
25.66
ms

|
24.29
ms

|
0
ps

|

0
|

0
|

0
|

0
|

|
root
|
show_fields

|

66
|
22.35
ms

|
2.10
ms

|
0
ps

|

276
|

276
|

0
|

66
|

|
root
|
show_triggers

|

33
|
17.33
ms

|
1.59
ms

|
0
ps

|

0
|

0
|

0
|

33
|

|
root
|
show_table_status
|

33
|
8.69
ms

|
384.26
us

|
0
ps

|

33
|

33
|

0
|

33
|

|
root
|
create_db

|

7
|
1.47
ms

|
332.44
us

|
0
ps

|

0
|

0
|

7
|

0
|

|
root
|
flush

|

1
|
902.74
us

|
902.74
us

|
822.00
us

|

0
|

0
|

0
|

0
|

|
root
|
jump_if_not

|

295
|
833.81
us

|
20.04
us

|
0
ps

|

0
|

0
|

0
|

0
|

|
root
|
create_procedure

|

2
|
393.48
us

|
226.63
us

|
220.00
us

|

0
|

0
|

0
|

0
|

|
root
|
drop_procedure

|

2
|
392.08
us

|
301.71
us

|
289.00
us

|

0
|

0
|

0
|

0
|

|
root
|
Init
DB

|

10
|
338.30
us

|
73.47
us

|
0
ps

|

0
|

0
|

0
|

0
|

|
root
|
freturn

|

46
|
281.04
us

|
39.39
us

|
0
ps

|

0
|

0
|

0
|

0
|

|
root
|
Statistics

|

3
|
67.26
us

|
31.78
us

|
0
ps

|

0
|

0
|

0
|

0
|

|
root
|
Quit

|

3
|
54.40
us

|
19.70
us

|
0
ps

|

0
|

0
|

0
|

0
|

+-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+

Summary
Views

Resource
ConsumpNon
based
on
host
connecNvity

mysql>
select
*
from
sys.host_summaryG

***************************
1.
row
***************************

host:
localhost

statements:
15588

statement_latency:
2.76
h

statement_avg_latency:
637.81
ms

table_scans:
198

file_ios:
566859

file_io_latency:
16.10
m

current_connections:
3

total_connections:
6

unique_users:
1

current_memory:
0
bytes

total_memory_allocated:
0
bytes

1
row
in
set
(0.15
sec)

Summary
Views

InnoDB
Buﬀer
Pool
Stats
based
on
Table.

mysql>
select
*
from
sys.innodb_buffer_stats_by_table;

+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+

|
object_schema

|
object_name

|
allocated

|
data

|
pages

|
pages_hashed
|
pages_old
|
rows_cached
|

+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+

|
testsoffice_sql
|
TEST_TABLE_0

|
22.20
GiB

|
19.42
GiB

|
1455134
|

1455134
|

1455134
|

16828504
|

|
testsoffice_sql
|
TEST_TABLE_l

|
947.80
MiB
|
887.60
MiB
|

60659
|

60659
|

60659
|

4393691
|

|
testsoffice_sql
|
TEST_TABLE_2

|
120.70
MiB
|
74.42
MiB

|

7725
|

7725
|

7725
|

1482091
|

|
testsoffice_sql
|
TEST_TABLE_3

|
60.55
MiB

|
44.19
MiB

|

3875
|

3875
|

3875
|

545475
|

|
testsoffice_sql
|
TEST_TABLE_4

|
55.58
MiB

|
49.66
MiB

|

3557
|

3557
|

3557
|

671925
|

|
testrsync

|
TEST_TABLE_5

|
53.50
MiB

|
37.03
MiB

|

3424
|

3424
|

3424
|

205086
|

|
testsoffice_sql
|
TEST_TABLE_6

|
29.23
MiB

|
18.43
MiB

|

1871
|

1871
|

1871
|

43250
|

|
testsoffice_sql
|
TEST_TABLE_7

|
21.31
MiB

|
19.37
MiB

|

1364
|

1364
|

1364
|

42888
|

|
testrsync

|
TEST_TABLE_8

|
18.80
MiB

|
13.79
MiB

|

1203
|

1203
|

1203
|

63859
|

|
testsoffice_sql
|
TEST_TABLE_9

|
14.95
MiB

|
9.87
MiB

|

957
|

957
|

957
|

49498
|

+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+

Summary
Views

Finding
the
Hot
tables

mysql>
select
*
from
sys.schema_table_statistics
limit
2G

***************************
1.
row
***************************

table_schema:
test_database

table_name:
test_table1

total_latency:
2.68
h

rows_fetched:
0

fetch_latency:
0
ps

rows_inserted:
10426278

insert_latency:
2.68
h

rows_updated:
0

update_latency:
0
ps

rows_deleted:
0

delete_latency:
0
ps

io_read_requests:
19

io_read:
5.31
KiB

io_read_latency:
43.69
us

io_write_requests:
37

io_write:
6.10
KiB

io_write_latency:
54.50
us

io_misc_requests:
24

io_misc_latency:
40.31
ms

***************************
2.
row
***************

table_schema:
db2

table_name:
table_2

total_latency:
3.76
s

rows_fetched:
0

fetch_latency:
0
ps

rows_inserted:
7488

insert_latency:
3.76
s

rows_updated:
0

update_latency:
0
ps

rows_deleted:
0

delete_latency:
0
ps

io_read_requests:
19

io_read:
1.80
KiB

io_read_latency:
39.66
us

io_write_requests:
101

io_write:
1.25
MiB

io_write_latency:
1.72
ms

io_misc_requests:
64

io_misc_latency:
3.45
s

Summary
Views

Memory
DistribuNon
inside
MySQL

select * from memory_global_by_current_bytes limit 10;
+------------------------------------------------------------------------------+---------------+---------------+-------------------
+------------+------------+----------------+
| event_name | current_count | current_alloc | current_avg_alloc |
high_count | high_alloc | high_avg_alloc |
+------------------------------------------------------------------------------+---------------+---------------+-------------------
+------------+------------+----------------+
| memory/performance_schema/events_statements_history_long | 1 | 13.66 MiB | 13.66 MiB |
1 | 13.66 MiB | 13.66 MiB |
| memory/performance_schema/events_statements_history_long.tokens | 1 | 9.77 MiB | 9.77 MiB |
1 | 9.77 MiB | 9.77 MiB |
| memory/performance_schema/events_statements_history_long.sqltext | 1 | 9.77 MiB | 9.77 MiB |
1 | 9.77 MiB | 9.77 MiB |
| memory/performance_schema/events_statements_summary_by_digest.tokens | 1 | 9.77 MiB | 9.77 MiB |
1 | 9.77 MiB | 9.77 MiB |
| memory/performance_schema/table_handles | 1 | 9.00 MiB | 9.00 MiB |
1 | 9.00 MiB | 9.00 MiB |
| memory/performance_schema/events_statements_summary_by_thread_by_event_name | 1 | 8.67 MiB | 8.67 MiB |
1 | 8.67 MiB | 8.67 MiB |
| memory/performance_schema/memory_summary_by_thread_by_event_name | 1 | 5.62 MiB | 5.62 MiB |
1 | 5.62 MiB | 5.62 MiB |
| memory/performance_schema/events_statements_summary_by_digest | 1 | 4.88 MiB | 4.88 MiB |
1 | 4.88 MiB | 4.88 MiB |
| memory/performance_schema/events_statements_summary_by_account_by_event_name | 1 | 4.33 MiB | 4.33 MiB |
1 | 4.33 MiB | 4.33 MiB |
| memory/performance_schema/events_statements_summary_by_host_by_event_name | 1 | 4.33 MiB | 4.33 MiB |
1 | 4.33 MiB | 4.33 MiB |
+------------------------------------------------------------------------------+---------------+---------------+-------------------
+------------+------------+----------------+

Summary
Views

Finding
the
Global
Wait
Latency

mysql>

select
*
from
waits_global_by_latency
limit
10;

+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+

|
events

|
total

|
total_latency
|
avg_latency
|
max_latency
|

+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+

|
wait/io/file/innodb/innodb_data_file

|

3025950
|
2.84
h

|
3.38
ms

|
1.11
s

|

|
wait/io/table/sql/handler

|
11025308
|
2.83
h

|
923.86
us

|
1.56
s

|

|
wait/io/file/innodb/innodb_log_file

|

56941
|
32.53
m

|
34.28
ms

|
565.85
ms

|

|
wait/io/file/sql/FRM

|

12044
|
7.96
s

|
660.69
us

|
315.66
ms

|

|
wait/io/file/myisam/dfile

|

93
|
361.95
ms

|
3.89
ms

|
287.33
ms

|

|
wait/io/file/sql/io_cache

|

487
|
67.34
ms

|
138.28
us

|
39.98
ms

|

|
wait/io/file/sql/file_parser

|

104
|
15.29
ms

|
147.05
us

|
14.78
ms

|

|
wait/io/file/archive/data

|

256
|
853.56
us

|
3.33
us

|
13.89
us

|

|
wait/io/file/sql/dbopt

|

33
|
564.94
us

|
17.12
us

|
67.70
us

|

|
wait/io/file/sql/ERRMSG

|

5
|
518.37
us

|
103.67
us

|
468.87
us

|

|
wait/io/file/myisam/kfile

|

118
|
403.17
us

|
3.42
us

|
74.57
us

|

|
wait/lock/table/sql/handler

|

127
|
301.39
us

|
2.37
us

|
5.13
us

|

|
wait/io/file/sql/misc

|

7
|
145.62
us

|
20.80
us

|
33.73
us

|

|
wait/io/file/sql/casetest

|

10
|
142.10
us

|
14.21
us

|
80.76
us

|

|
wait/io/file/sql/pid

|

3
|
136.44
us

|
45.48
us

|
108.86
us

|

|
wait/io/file/mysys/cnf

|

5
|
51.82
us

|
10.36
us

|
20.47
us

|

|
wait/io/file/mysys/charset

|

3
|
25.89
us

|
8.63
us

|
13.81
us

|

|
wait/io/file/keyring_file/keyring_file_data

|

4
|
18.76
us

|
4.69
us

|
13.98
us

|

|
wait/io/file/sql/global_ddl_log

|

2
|
6.06
us

|
3.03
us

|
3.49
us

|

|
wait/io/file/keyring_file/keyring_backup_file_data
|

1
|
4.35
us

|
4.35
us

|
4.35
us

|

+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+

Summary
Views

Tables
with
FTS
(
Full
Table
Scan)
queries

mysql>
select
*
from
schema_tables_with_full_table_scans;

+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+

|
object_schema

|
object_name

|
rows_full_scanned
|
latency

|

+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+

|
dbbase_sample_2
|
TESTSTATS

|

1639668
|
20.16
m

|

|
dbbase_sample_2
|
TABLEP_TESTS

|

174365
|
814.35
ms
|

|
dbbase_sample_2
|
TESTTB

|

83577
|
195.37
ms
|

|
dbbase_sample_2
|
TABLE_STATS

|

14124
|
31.96
s

|

|
dbbase_sample_2
|
TABLE_FILE1

|

3215
|
31.18
ms

|

|
dbbase_sample_2
|
TABLE_FILE2

|

2552
|
27.44
ms

|

|
dbbase_sample_2
|
TABLE_FILE4

|

2306
|
368.97
ms
|

|
database_sample
|
TABLE_FILE6

|

1602
|
151.13
ms
|

|
dbbase_sample_2
|
TABLE_FILE8

|

16
|
16.13
ms

|

|
sys

|
TABLE_FILE9

|

6
|
137.39
us
|

+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐+

Summary
Views

Find
queries
creaNng
temp
tables.

mysql>
select
*
from
statements_with_temp_tables
limit
2G

***************************
1.
row
***************************

query:
SELECT
DISTINCT
ROW
`COLUMN3`
FRO
...
NOT
IN
(...)
ORDER
BY
`COLUMN4`

db:
TEST_DB

exec_count:
321

total_latency:
1.59
s

memory_tmp_tables:
321

disk_tmp_tables:
0

avg_tmp_tables_per_query:
1

tmp_tables_to_disk_pct:
0

first_seen:
2016-‐04-‐03
11:00:02

last_seen:
2016-‐04-‐05
16:20:01

digest:
ad3f312c08d1e324cde5ff9e7f5b7513

***************************
2.
row
***************************

query:
SELECT
DISTINCTROW
(
`COLUMN1`
)
FROM
`TABLE`

db:
TEST_DB

exec_count:
176

total_latency:
50.65
ms

memory_tmp_tables:
176

disk_tmp_tables:
0

avg_tmp_tables_per_query:
1

tmp_tables_to_disk_pct:
0

first_seen:
2016-‐04-‐03
11:52:04

last_seen:
2016-‐04-‐05
13:52:04

digest:
d0a288bf2140849667259fcfbf2b9619

Summary
Views

•  Sys
schema
can
help
a
lot
in
monitoring
and
Fine
Tuning.

•  Monitoring
and
alert
systems
can
benefitted
a
lot
by
it.

•  Seems
like
MEM
3.2
has
implemented
most
of
sys
schema
tables.

•  Large
scale
MySQL
Farms
can
poll
the
sys
schema
views
to

centralized
servers
for
historical
data
analysis.

How MyDBOPS Can Help You ?
• 

MySQL
Consulting

• 

MySQL
Support

• 

Remote
DBA

• 

MySQL
Health
Audit

• 

24
*
7
Support

Contact
:

mysqlsupport@mydbops.com

An Overview to MySQL SYS Schema

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