IOUG Collaborate 2014 ASH/AWR Deep Dive

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  • 1. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 121
  • 2. Deep Dive to ASH and AWR with EM12c Kellyn Pot‟Vin Consulting Member of Technical Team Strategic Customer Program
  • 3. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 123 The following is intended to outline our general product direction. It is intended for information purposes only, and may not be incorporated into any contract. It is not a commitment to deliver any material, code, or functionality, and should not be relied upon in making purchasing decisions. The development, release, and timing of any features or functionality described for Oracle‟s products remains at the sole discretion of Oracle.
  • 4. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 124 Program Agenda  What am I asked about?  Easiest Way to Get the Job Done – ASH/AWR Reports in EM12c – Compare ADDM – Search SQL, (Least known and very valuable tool) – Top Tricks in EM12c with ASH and AWR
  • 5. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 125 Brief History  ASH= Active Session History  AWR= Automatic Workload Repository  Introduced in Oracle 10g  Evolution to statspack, requests for performance reporting improvements.  “Always on” approach to performance metrics with requirement of non- locking collection process.  Requires Management Tuning Pack License from Oracle.
  • 6. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 126  Read vs. Write  MMON, MMNL  In Memory vs. written to disk ASH Architecture Build and Buffer
  • 7. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 127  Read vs. Write  MMON, MMNL  In Memory vs. written to disk ASH Architecture Build and Buffer
  • 8. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 128  Read vs. Write  MMON, MMNL  In Memory vs. written to disk ASH Architecture Build and Buffer
  • 9. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 129 The Location in EM12c For Some of Today’s Presentation…
  • 10. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1210 Running ASH Report from EM • ASH is by time, not snapshot. • Set start date and time. • End date and time • Generate report
  • 11. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1211  Beginning and End Time of Report  How Many Samples  Average # of Sessions  Target information in Report HTML Format ASH Report Details
  • 12. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1212 Top 5 Events 12
  • 13. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1213 SQL Top Events 13
  • 14. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1214 Top Row Source 14
  • 15. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1215 Top PL/SQL Procedures 15
  • 16. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1216 Top Sessions 16
  • 17. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1217 Blocking Sessions 17
  • 18. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1218 Parallel Processes 18
  • 19. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1219 Activity Over Time 19
  • 20. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1220 ASH- What have we learned?  Solid information from samples for a time period of activity  Shouldn‟t be used for # of occurrences, as it‟s based on samples.  Excellent reporting on – Percentage of activity – SQL information – Procedural info – Blocking Sessions – Activity over time. 20
  • 21. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1221 How Often Do We Ask, “What Changed?”  It ran fine last week, now it isn‟t!  ETL loads have changed, but no one has released any new code!  The DBA says there hasn‟t been any parameter changes to this database, but I‟m sure there have been.  Compare ADDM Resolution
  • 22. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1222 What is Compare ADDM?  Uses Two AWR snapshots  Creates Report that- – Compares SQL that is common and different. – SGA changes – IO/CPU bound issues – Parameter Changes
  • 23. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1223 What is in an ADDM Compare?  Report Includes Following: – Clear Demonstration of impact of change. – Recommendations to address issue. – Identifies causes behind change, (with limitations.) – Lists Regressed SQL, too! – Tip: If Installing to database for first time, (simple installation, nothing to concern about, just pkg to fulfill views) you must have preferred credentials SET of install will fail!
  • 24. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1224  Choose focus period  Choose to compare to an Offset, Baseline or Custom Executing a Report from EM12c Comparison
  • 25. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1225  Familiar interface with visual wait event comparisons.  Average # of sessions during each period are displayed. Main Screen of Comparison 2-3PM, 12th Vs. 13th
  • 26. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1226 Detail Report  High level data, highlight for analysis and recommendations.
  • 27. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1227 Regression SQL  Any performance degradation is noted with the down arrow icon:
  • 28. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1228 Top Segments Causing IO Waits  High Level data  Click on “Show Hot Object Breakdown” to see more detail.
  • 29. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1229 Resource Comparisons  Comparisons of Memory, CPU, IO and Interconnect.  Memory Is there Virtual paging?  Memory Base Period  Memory Comparison Period
  • 30. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1230 Dashboard Provided for CPU, Memory, IO and Interconnect  Is something OTHER than Oracle the cause?
  • 31. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1231 IO Bound Dashboard  Base vs. comparison period  Temp reads/writes specified  Single block read latency
  • 32. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1232 SQL Monitor, EM12c Style  One More way to identify performance issues.  Monitoring view ease for those less familiar with database performance.
  • 33. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1233 SQL Monitor Dashboard Status of Statement Wait EventsDegree of Parallelism SQL_ID SQL Text
  • 34. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1234 Exadata and Offloading  Drill down to specific statement within SQL Monitor will display offload efficiency per statement.
  • 35. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1235 Full Detail of SQL Execution
  • 36. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1236 View Report
  • 37. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1237 SQL Monitor Report CLI SET LONG 1000000 SET LONGCHUNKSIZE 1000000 SET LINESIZE 1000 SET PAGESIZE 0 SET TRIM ON SET TRIMSPOOL ON SET ECHO OFF SET FEEDBACK OFF SELECT DBMS_SQLTUNE.report_sql_monitor( sql_id => '5vh6y3b7tnv8r', type => 'TEXT', report_level => 'ALL') AS report FROM dual;
  • 38. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1238 Text Output of SQL Monitor
  • 39. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1239 One of the Best & Least Used Features in EM Search SQL Problem Query
  • 40. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1240  Available since OEM 10g  Strong, but simple feature to assist the DBA  4v2tsp8dz0nhn is our SQL_ID  Go to the EM Console, (Example is EM12c) We Have the SQL_ID, What’s Next? Search SQL
  • 41. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1241 Search SQL Interface  Choose AWR Snapshots, (change Time Period), AWR Baselines and put SQL_ID
  • 42. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1242 Click on Search  SQL_ID link for SQL Details  Split up by tabs for Cursor, AWR, Baselines and SQL Tuning Sets  Plan Hash Value  Elapsed Time
  • 43. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1243 AWR Data
  • 44. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1244 Snapshot IDs  Click on Snapshot ID and gather valuable data on resource usage during snapshot time or choose to view report.
  • 45. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1245 AWR Report or Run ADDM Report
  • 46. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1246 Running Reports, Command Line $ORACLE_HOME/rdbms/admin/awrrpt.sql; $ORACLE_HOME/rdbms/admin/ashrpt.sql; $ORACLE_HOME/rdbms/admin/awrsqrpt.sql;
  • 47. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1247 Running Reports, Command Line $ORACLE_HOME/rdbms/admin/awrrpt.sql; $ORACLE_HOME/rdbms/admin/ashrpt.sql; $ORACLE_HOME/rdbms/admin/awrsqrpt.sql; Less Known AWR Reports: awrinfo.sql General AWR Info awrddrpt.sql Comparison report between snapshots awrblmig.sql Migrates pre-11g baseline data into 11g Baseline tables. awrgrpt.sql RAC Aware AWR Report.
  • 48. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1248 AWR Info Report  Snapshot Interval Information  Basic Info on Instances and Nodes  No User or Application Schema info.  Space Usage by SYSAUX  WRH$ and Non- AWR Objects, ordered by size  Snapshot info and if any errors.  Advisor Tasks
  • 49. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1249 AWR Info Report
  • 50. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1250 ASH Info Report
  • 51. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1251 SQL_ID Specific AWR Report
  • 52. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1252 “Interesting Part”
  • 53. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1253 Finale! Select * from table(dbms_xplan.display_awr(„43mp3mjufgnkg‟));
  • 54. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1254 Querying ASH Data Directly  More defined reporting  No need to pull full report  Detail on waits that are of interest  Join to non-AWR objects  Simple queries presented…
  • 55. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1255 V$ACTIVE_SESSION_HISTORY  SAMPLE_ID- This is a unique identifier within an ASH sample.  SAMPLE_TIME- A unit of time used by Active Session History  USER_ID- Identifier for a user that‟s executing the session.  SESSION_ID- Same as the SID or Session ID and can be used to join to SID in other views/tables.  SESSION_STATE- What was the state of the session when ASH recorded the sample.  ON CPU/WAITING- The two session states in Active Session History. ON CPU is active, vs. Waiting, which is self-explanatory.  EVENT- Type of event that the session is currently active or waiting on.  TIME_WAITED- How long the session has been waiting if waiting.  WAIT_TIME- Confusing- but this is populated by any wait time if the session is currently active for the previous waits.  SQL_ID- The unique identifier for the SQL statement being executed.  SQL_CHILD_NUMBER-The cursor child number.
  • 56. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1256 Session Averages select ROUND(RATIO_TO_REPORT(SUM(1)) OVER () * 100 ,2) PERCENTAGE, ash.session_type SESS_TYPE, session_state STATUS, decode(nvl(sql_id,'-1'),'-1','nonsql','sql') SQL_TYPE, count(distinct to_char(session_id)|| to_char(session_serial#)) SESS_CNT from v$active_session_history ash where sample_time > sysdate - 30/(24*60) and ( ( ash.session_state = 'ON CPU' ) or ( ash.session_type != 'BACKGROUND' ) ) group by ash.session_type, ash.session_state, decode(nvl(sql_id,'-1'),'-1','nonsql','sql') order by count(*) /
  • 57. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1257 Session Avg. Output  Note the % of Background processes
  • 58. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1258 Inspecting What col type for a20 select * from (select ash.SQL_ID , ash.SQL_PLAN_HASH_VALUE Plan_hash, aud.name type, sum(decode(ash.session_state,'ON CPU',1,0)) "CPU", sum(decode(ash.session_state,'WAITING',1,0)) "WAITING", sum(decode(ash.session_state,'WAITING', decode(wait_class, 'User I/O',1,0),0)) "IO WAIT" , sum(decode(ash.session_state,'WAITING', decode(wait_class, 'User I/O',1,0),0)) "IO" , sum(decode(ash.session_state,'WAITING', decode(wait_class, 'Concurrency',1,0))) "CONCURRENCY" , sum(decode(ash.session_state,'WAITING', decode(wait_class, 'Application',1,0))) "Application" , sum(decode(ash.session_state,'ON CPU',1,1)) "TOTAL" from v$active_session_history ash, audit_actions aud where SQL_ID is not NULL and ash.sql_opcode=aud.action and ash.sample_time > sysdate - &minutes /( 60*24) group by sql_id, SQL_PLAN_HASH_VALUE , aud.name order by sum(decode(session_state,'ON CPU',1,1)) desc ) where rownum < 5;
  • 59. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1259 12 Min. View of Waits by SQL_ID  Choose Time in Minutes To Review, (10 in our example)  SQL_ID and Plan Hash Value Shown  Waits for CPU, Wait, IO Wait and others.
  • 60. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1260 Quantity of Events Occurred Over Small Amounts of Time Col event for a50 select event, count(1) from v$active_session_history where sample_time between to_date('21-FEB-14 01.43.00 PM','dd-MON-yy hh:mi:ss PM') and to_date('21-FEB-15 01.53.00 PM','dd-MON-yy hh:mi:ss PM') group by event order by event;
  • 61. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1261 Results, Where to Focus?
  • 62. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1262 Transaction Wait Detail select to_char(sample_time,'HH:MI') st, substr(event,0,20) event, ash.session_id sid, mod(ash.p1,16) lm, ash.p2, ash.p3, nvl(o.object_name,ash.current_obj#) objn, substr(o.object_type,0,10) otype, CURRENT_FILE# fn, CURRENT_BLOCK# blockn, ash.SQL_ID, BLOCKING_SESSION bsid from v$active_session_history ash, all_objects o where event like 'enq: TX%' and o.object_id (+)= ash.CURRENT_OBJ# and sample_time > sysdate - 10/(60*24) Order by sample_time
  • 63. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1263 Transaction Lock Output  What TX row locks are occurring!
  • 64. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1264 Knowing What’s in the ASH Buffer • Deters from making assumptions on what data is being queried. • Know your samples!
  • 65. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1265 Wait Events Across Nodes
  • 66. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1266 Query top 10 SQL_ID‟s in the last 10 minutes?
  • 67. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1267 SQL_ID and CPU Usage
  • 68. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1268 IO Waits by Object from ASH
  • 69. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1269 SQL Text with ASH • SQL for most recent five minutes of sample data from ASH
  • 70. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1270 SQL Results • SQL_ID, SQL Text, Sample Time that Process was captured in.
  • 71. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1271 Average Activity- Graphed
  • 72. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1272 select to_char(to_date(tday||' '||tmod*&v_secs,'YYMMDD SSSSS'),'DD-MON HH24:MI:SS') tm, samples npts,total/&samples aas, substr(substr(substr(rpad('+',round((cpu*&v_bars)/&samples),'+') || rpad('-',round((waits*&v_bars)/&samples),'-') || rpad(' ',p.value * &v_bars,' '),0,(p.value * &v_bars)) || p.value || substr(rpad('+',round((cpu*&v_bars)/&samples),'+') || rpad('-',round((waits*&v_bars)/&samples),'-') || rpad(' ',p.value * &v_bars,' '),(p.value * &v_bars),10) ,0,30) ,0,&v_graph)graph,total,cpu, waits from ( select to_char(sample_time,'YYMMDD')tday , trunc(to_char(sample_time,'SSSSS')/&v_secs) tmod , sum(decode(session_state,'ON CPU',1,decode(session_type,'BACKGROUND',0,1))) total , (max(sample_id) - min(sample_id) + 1 ) samples , sum(decode(session_state,'ON CPU' ,1,0)) cpu , sum(decode(session_type,'BACKGROUND',0,decode(session_state,'WAITING',1,0))) waits /* for waits I want to subtract out the BACKGROUND but for CPU I want to count everyon */ from v$active_session_history where sample_time > sysdate - &v_hours/24 group by trunc(to_char(sample_time,'SSSSS')/&v_secs), to_char(sample_time,'YYMMDD')
  • 73. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1273 Query Cont. union all select to_char(sample_time,'YYMMDD')tday , trunc(to_char(sample_time,'SSSSS')/&v_secs) tmod , sum(decode(session_state,'ON CPU',10,decode(session_type,'BACKGROUND',0,10))) total , (max(sample_id) - min(sample_id) + 1 ) samples , sum(decode(session_state,'ON CPU' ,10,0)) cpu , sum(decode(session_type,'BACKGROUND',0,decode(session_state,'WAITING',10,0))) waits /* for waits I want to subtract out the BACKGROUND but for CPU I want to count everyon */ from dba_hist_active_sess_history where sample_time > sysdate - &v_hours/24 and sample_time < (select min(sample_time) from v$active_session_history) group by trunc(to_char(sample_time,'SSSSS')/&v_secs), to_char(sample_time,'YYMMDD')) ash, v$parameter p where p.name='cpu_count' order by to_date(tday||' '||tmod*&v_secs,'YYMMDD SSSSS') / 73
  • 74. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1274 Pivot the Wait Events
  • 75. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1275 Digging into History  DBA_HIST_ACTIVE_SESS_HISTORY – SNAP_ID – SAMPLE_ID – SAMPLE_TIME – SESSION_ID – USER_ID – SQL_ID – WAIT_CLASS – SESSION_STATE – PGA_ALLOCATED
  • 76. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1276 Process Information SELECT * FROM ( SELECT /*+ PARALLEL */ count(*) AS count, user_id, program, module, sql_id FROM SYS.DBA_HIST_ACTIVE_SESS_HISTORY WHERE sample_time > TO_DATE('19-FEB-2014 03.00.00 PM','dd-MON-yy hh:mi:ss PM') AND sample_time < TO_DATE('19-FEB-2014 08.00.00 PM','dd-MON-yy hh:mi:ss PM') AND program LIKE 'oracle@%' GROUP BY user_id, program, module, machine, sql_id ORDER BY count(*) desc ) WHERE rownum <= 20 /
  • 77. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1277 Results of Process History
  • 78. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1278 Tyler Muth ASH Mining Query
  • 79. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1279 ASH Mining Output Additional Options: • Physical Read Averages • Physical Writes, (Max/Averages) • Redo Info • Logon Info • Hard Parsing, etc.
  • 80. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1280 Best Practice When Querying ASH Data  Keep it Simple and don‟t reinvent the wheel.  Samples are an alias for time, not for counts.  Understand what is valuable and compare to packaged reports.  Be aware on RAC of node specific data.  Take care when querying Obj#, File# and Block#, (still issues in different versions…)  Check the time that is available in buffer, don‟t assume!
  • 81. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1281 AWR/ASH Links/Blogs  Tyler Muth: http://tylermuth.wordpress.com/  Kyle Hailey, John Beresniewicz, Graham Wood: http://ashmasters.com/  Mine- “For the Love of ASH and AWR” http://dbakevlar.com/2011/02/for-the-love-of-awr-and-ash/  Oracle- http://www.oracle.com/technetwork/oem/db-mgmt/db-mgmt- 093445.html
  • 82. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1282 Connect with me-
  • 83. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1283
  • 84. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 1284