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AWR, ASH with EM13 at HotSos 2016

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AWR and ASH on EM13c for DB12c at HotSos Symposium 2016

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AWR, ASH with EM13 at HotSos 2016

  1. 1. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | Performance Data with EM13c and DB12c AWR , ASH and Other Performance Data Deep Dive Kellyn Pot’Vin-Gorman Consulting Member of Technical Staff, SCP Enterprise Manager March, 2016
  2. 2. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | DBA Kevlar, the Geek Goth Girl
  3. 3. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | Safe Harbor Statement 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. 4. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | Why an Updated Session While building and testing the Performance Tuning DB12c exam, it became apparent is was needed.
  5. 5. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | Program Agenda Revisit to AWR Top Changes Automatic Workload Repository Active Session History The Rest of the Cool Stuff 1 2 3 4 5
  6. 6. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | Program Agenda with Highlight Revisit to AWR Top Changes Automatic Workload Repository Active Session History The Rest of the Cool Stuff 1 2 3 4 5
  7. 7. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | History of AWR and ASH • 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 Diagnostic Pack License from Oracle.
  8. 8. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | AWR and ASH Architecture DBA_HIST Views V$ Views Along with AWR Data Memory Buffers write one way, users read the opposite direction! and MMON
  9. 9. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | Why Do We Combine Diagnostic and Tuning Packs? Tuning Pack includes the Following: • SQL Monitor • SQL Access Advisor • SQL Tuning Advisor These products source their data from AWR….
  10. 10. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | Other Important Reports to know: $ORACLE_HOME/rdbms/admin/awrrpt.sql; $ORACLE_HOME/rdbms/admin/ashrpt.sql; $ORACLE_HOME/rdbms/admin/awrsqlrpt.sql; awrinfo.sql General AWR Info –Very important for AWR Warehouse! awrddrpt.sql Comparison report between snapshots awrgrpt.sql RAC Aware AWR Report.
  11. 11. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | What NOT to DO to the AWR • Underscore parameter changes to spfile that change the default settings for ASH samples, intervals, etc. – DON’T DO IT. Step away….walk away from the keyboard. NOW.
  12. 12. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | Program Agenda with Highlight Revisit to AWR Top Changes Automatic Workload Repository Active Session History Rest of the Cool Stuff 1 2 3 4 5
  13. 13. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | A lot of additions for In-Memory! • Manageability support for In-Memory Column Store • The new Oracle Database In-Memory Column Store (IM column store) feature accelerates database performance of analytics, data warehousing, and online transaction processing (OLTP) applications. • SQL Monitor report, ASH report, and AWR report now show statistics for various in-memory operations.
  14. 14. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | Configuring is Now a Breeze
  15. 15. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | Managing Even Easier with In-Memory Central
  16. 16. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | New to ASH Analytics Average Active Sessions chart • Click on CPU wait class to see its breakdown by CPU usage for various in- memory operations • View various CPU used for operations other than in-memory operations.
  17. 17. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | Why Are These Changes Important? In-memory Column store data is very quick to query, but just like other features, if advanced sorting and “massaging” of the data is required, complex performance issues can arise. AWR and Enterprise Manager offers a window into these when challenges occur.
  18. 18. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | Program Agenda with Highlight Revisit to AWR Top Changes Automatic Workload Repository Active Session History The Rest of the Cool Stuff 1 2 3 4 5
  19. 19. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | Report Changes Top ADDM Findings as Part of the AWR Report
  20. 20. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | Foreground Events Displays Top TEN Foreground Events CPU Should be top…to a point…
  21. 21. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | Top Elapsed Time is Still King Tune for time or you’re wasting time…
  22. 22. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | Changes in AWR Report for In-Memory In-Memory Segments Statistics • Shows in-memory segment consumption based on various attributes, such as, scans, DB block changes, populate CUs, and repopulate CUs. • Time Model Statistics section shows statistics related to in-memory CPU usage and Instance Activity Statistics section shows statistics related to in-memory activities.
  23. 23. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | Wait Class by Total Wait Time
  24. 24. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | The IO Profile For OLAP and DSS Systems, Great Section in Report
  25. 25. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | Other New Sections • Goldengate • Xstreams • Resource Stats • Advanced Queuing Data
  26. 26. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | Example of Why AWR is Still the Gold Standard • EM Health Review in Preparation to Upgrade to EM13c • EM Diagnostics is Run on Repository, OMS and Agents. • Author of Diagnostics starts from OMS tier, unsure of what is impact Where do I start in the Diagnostics data as an Optimization DB Specialist?
  27. 27. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | AWR Data in Part of EM Diagnostics, (OMSVFY) There are no mviews in the OMR! Never heard of you!
  28. 28. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | Physical Reads You both are an unknown!
  29. 29. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | The Folly Created Materialized View on top of Metric Tables Used by Enterprise Mgr Mview created pressure on roll up processing that aggregate the data from source tables. To eliminate the overhead, the rollup jobs were shut off Mview AND EM console slow to unusable state as raw metric tables become huge. Creates own schema objects Loads more into own objects
  30. 30. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | Time Requirements Without Using AWR Data for Healthcheck to Diagnose Performance Issues With Using AWR Data for Healthcheck to Diagnose Performance Issues 8 Months and No Answer 12 Hours and Resolution
  31. 31. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | Program Agenda with Highlight Revisit to AWR Top Changes Automatic Workload Repository Active Session History The Rest of the Cool Stuff 1 2 3 4 5
  32. 32. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | The Best of ASH 1. Active Session History work off ASH Time with ASH samples and not exclusive to AWR snapshots. 2. Small Windows of time to isolate database challenges. 3. Shows the “Forrest for the Trees”. Great for Complex Issues. 4. Includes Blocking, DOP, Procedural calls and session information.
  33. 33. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | ASH Report Changes • ASH report header table shows the size of in-memory pool under In Memory Area column. • Top Events, Top SQL, and Activity Over Time sections show CPU consumption by various in-memory operations.
  34. 34. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | P Value Top Events Table Presented
  35. 35. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | Saves You From Having to do This: The values represent: P1—The absolute file number for the data file involved in the wait. P2—The block number within the data file referenced in P1 that is being waited upon. P3—The reason code describing why the wait is occurring. select p1 "File #“, p2 "Block #", p3 "Reason Code“ from v$session_wait where event = 'xxx';
  36. 36. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | Know the Module, Know the Action Shows Percentage of Activity for Action
  37. 37. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | Top SQL and PL/SQL Procedures
  38. 38. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | Blocking Sessions Displayed Clearly
  39. 39. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | How Did it Change Over The Time Elapse?
  40. 40. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | ASH Analtyics, the New Top Activity
  41. 41. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | Details of SQL and Sessions…Plus More Capability to update each column to demonstrate different data.
  42. 42. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | The Chameleon View Data by Wait Class and Blocking Sessions
  43. 43. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | Using ASH Analtyics with Search SQL
  44. 44. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | Searching SQL with ASH Analytics • Copy SQL_ID from ASH Analtyics • Go to Search SQL
  45. 45. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | Change Defaults Include AWR, (ALL) and AWR Baselines. Paste in the SQL_ID before clicking on “RUN”
  46. 46. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | Remember the Tabs Click on SQL_ID to proceed to Details
  47. 47. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | Why ASH shouldn’t be used for Auditing Thanks to Graham, Uri and JB for this wonderful graphic!
  48. 48. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | Why Time is Important Database Time • Total time spent by sessions in the database server actively working, (CPU) or actively waiting, (aka non-idle.) Active Sessions • The number of active sessions, (including waiting) in the database server at a specific time is the rate of change of database time during that period, (aka workload.)
  49. 49. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | Understanding ASH Time DBTime is calculated as an approximate made up by multiplying sampling interval by the total count of the samples. Keeping in mind that each sample represents 1 second of DBTime….. Then ASH Math results in: COUNT(*) = <DBTime> GROUP BY <Wait Event>
  50. 50. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | ASH Mining Querying ASH, (V$ or GV$ACTIVE_SESSION_HISTORY) Data DIRECTLY to Answer a Question…. • What are the top ten SQL ID’s in the last ten minutes?
  51. 51. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | How Often Were SQL ID’s on CPU vs. Waiting on CPU?
  52. 52. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | Monitoring Database Activity, New School SQL Monitor: Is it done yet? Did it use parallel? What important data do we know?
  53. 53. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | Change My View, Change My Outlook By updating the “Top 100 by” options, the data returned changes-
  54. 54. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | Details Top Info • If it’s Exadata, It will show offload percentage. • If it’s In-memory, it will include In-memory information.
  55. 55. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | What Kind of Resources in Layman Terms? Very little and I can prove it….
  56. 56. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | SQL Monitor and Adaptive Plans The Execution plan shows The Plan Statistics tab contains a drop down list to show current plan, final plan, and full plan. It also contains Plan Note button, which when clicked, shows the notes that are generated in the explain plan for the SQL statement.
  57. 57. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | Monitoring Use SQL Monitor. Execute on DBMS_SQL_MONITOR.REPORT_SQL_MONITOR View on V$SQL_MONITOR and V$SQL_PLAN_MONITOR
  58. 58. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | Adaptive Plans in SQL Monitor
  59. 59. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | Program Agenda with Highlight Revisit to AWR Top Changes Automatic Workload Repository Active Session History The Rest of the Cool Stuff 1 2 3 4 5
  60. 60. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | ASH Report Running Slow ASH Report taking over 8 hrs to complete! Sticking while pulling plan information on top SQL. Pulled Execution plan- joins to X$ tables to GV$Active_Session__History Merge Join Cartesians and million row hash table that wasn’t possible for amount of data in ash buffer. Collected fixed stats, (X$ tables) to correct.
  61. 61. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | Enterprise Manager Slowness Shut off SQL Baselines, (EM is NEVER GOING TO USE THEM!! SQL> ALTER SYSTEM SET optimizer_capture_sql_plan_baselines=false SCOPE=both; SQL> ALTER SYSTEM SET optimizer_use_sql_plan_baselines=false SCOPE=both; Tune the Job Pool, 1st get recommendation $ repvfy verify jobs -test 6007 -details Then update to recommended value: $ emctl set property -name oracle.sysman.core.conn.maxConnForJobWorkers -value <recommended> -module emoms
  62. 62. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | Tips to Tuning the Enterprise Manager- Java Heap is used heavily with the JVMD built into EM13c. Update from the default to 8Gb is highly recommended: $ emctl set property -name JAVA_EM_MEM_ARGS -value "-Xms256m –Xmx8192m -XX:MaxPermSize=768M - XX:+UseConcMarkSweepGC -XX:+UseParNewGC -XX:+CMSClassUnloadingEnabled -XX:CompileThreshold=8000 -XX:PermSize=128m"
  63. 63. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | The AWR Warehouse • Central warehouse configured for long term AWR data retention • Historical and ongoing AWR snapshots collected from databases enabled for AWR warehouse • ETL jobs moves snapshots from source databases into AWR warehouse • Retention period configurable for weeks, months, years or forever (default)
  64. 64. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | AWR ETL Jobs DBMS Job on Source Database to directory Job in EM Job Service that pulls file from Source Target and then pushes to AWR Warehouse Target Directory Final DBMS Job Inserts data into AWR Warehouse All data identified by OLD/NEW DBID and with the EM_ID, (CAW_DBID_MAPPING in AWR WAREHOUSE) Source Target Enterprise Manager AWR Warehouse
  65. 65. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | AWR Warehouse Interface • Warehouse dashboard tracking ETL jobs • All AWR features available on long term AWR data • Performance page • AWR report • ASH analytics • Compare Period ADDM • Compare Period Report • Integrated seamlessly into EM UI • Zero runtime overhead on source Production databases
  66. 66. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | New More Efficient Job Interface
  67. 67. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | ADDM Comparison in AWR Warehouse Yes, you can compare one snapshot against another snapshot in DIFFERENT database! 
  68. 68. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | CAW_DBID_MAPPING Table and AWR Mining Most important table for anyone querying the AWR Warehouse!
  69. 69. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | How Current AWR Mining Queries Change from dba_hist_sys_time_model stm, dba_hist_snapshot s, gv$parameter p, dbsnmp.caw_dbid_mapping m where stm.stat_name in ('DB CPU','background cpu time') and LOWER(m.target_name)= '&dbname' and s.dbid= m.new_dbid and s.snap_id = stm.snap_id and s.dbid = stm.dbid and s.instance_number = stm.instance_number and p.name = 'cpu_count' and p.inst_id = s.instance_number)
  70. 70. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | CPU Usage Issues “Nothing’s changed in months…”
  71. 71. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | Answer Specific IT Questions
  72. 72. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | Questions?
  73. 73. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. | Connect with me via Social Media:

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