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Winning performance challenges in oracle standard editions
- 1. Winning Performance Challenges inOracle Standard Editions Product Manager for Database Monitoring October 4th , 2018 Pini Dibask IOUG Webinar
- 2. 2 • Pini Dibask,Product Manager for Database Monitoring, Quest Software • Oracle ACE • Oracle Certified Professional DBA (OCP) • Public Speaker )Oracle OpenWorld, IOUG Collaborate, RMOUG, DOAG, OUGN, AOUG) • Blogger: OracleDBPro.BlogSpot.com [email protected] http://Linkedin.com/in/pinidibask @pini_dibask About the Speaker
- 3. 3 Where Am IFrom? Israel, Tel Aviv
- 4. 4 Who is QuestSoftware? 9 0 % o f F o r t u n e 1 0 0 using our software 1 , 5 0 0 engineers building quality products 4 M c o m m u n i t y m e m b e r s sharing best practices 3 , 5 0 0 employees focused on customers Quest is a global software provider trusted by 100,000 customers and 6,000 partners in 100 countries. We help IT organizations spend less time on administration and more time on innovation. 6 , 0 0 0 partners selling our software
- 5. 5 Toad databasedevelopment & management tools Foglight & Spotlight database performance monitoring solutions SharePlex for heterogeneous database replication Quest Database Tools
- 6. 6 Agenda Introduction toOracle database performance tuning Common challenges when using standard editions Winning performance challenges in standard editions Q&A
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- 8. Confidential8 Introduction to PerformanceTuning Data Dictionary Initialization Parameters ASH Time- Based Analysis Change Tracking SGA KPIs Blocking Locks Optimizer Statistics Historical Activity AWR Statspack Advisories Visualization ADDM SQL Tuning Baselines Latch Contention Plan Analysis
- 9. Confidential9 Instance Tuning Memory Allocations I/O Requirements CPU Resources Files Configurations Initialization Parameters Common PerformanceDiagnostics Approaches SQL Tuning Optimizer Statistics Plan Analysis Object Analysis Plan Stability Initialization Parameters
- 10. Confidential10 Instance Tuning -Common Things to Consider Initialization Parameters - (such as STATISTICS_LEVEL) Memory structures - ASMM, AMM, min size for buffer pools Files configuration - redo logs, undo tablespace Hardware configuration - memory, storage characteristics, network ASM configuration - disk groups and failure groups Connection management - both app level and DB level
- 11. Confidential11 Bad SQLs- using literals instead of bind variables Object analysis - Indexes, partitions, materialized views Optimizer statistics - last analyzed, dynamic statistics (OPTIMIZER_DYNAMIC_SAMPLING) Oracle features which may impact execution plans • SQL Profiles (10g) • Adaptive Cursor Sharing (11gR2) • Cardinality Feedback (11gR2) • Dynamic Statistics (12cR1) • Adaptive Plans (12cR1) Plan stability - SQL plan management (11gR1) SQL Tuning - Common Things to Consider
- 12. Confidential12 1. Determine themost significant bottleneck – i.e. best tuning opportunities 2. Improve/Fix it 3. Repeat it until performance is good My Blog Post: http://oracledbpro.blogspot.com/2015/09/simple-performance-tuning-methodology.html Simplified Performance Tuning Methodology
- 13. Confidential13 Time Based Analysis- Which statements should we address first? X Axis - db time (CPU time + Non idle wait events) Y Axis - number of executions
- 14. Confidential14 Time Based Analysis- Which statements should we address first? X Axis - db time (CPU time + Non idle wait events) Y Axis - number of executions
- 15. Confidential15 OK, we foundthe problematic statements - what’s next? What is the statement doing and why? • Execution plan + statistics • Most significant wait-events (DB Time standpoint) )e.g. “checkpoint not complete”, “db file scattered read”)
- 16. Confidential16 How can wefind them with enterprise edition & diagnostics pack? AWR ADDM ASH ASH Analytics SQL Tuning Advisory
- 17. Confidential17 How can wefind them with enterprise edition & diagnostics pack? AWR ADDM ASH ASH Analytics SQL Tuning Advisory
- 18. Confidential18 How can wefind them with enterprise edition & diagnostics pack? AWR ADDM ASH ASH Analytics SQL Tuning Advisory
- 19. Confidential19 How can wefind them with enterprise edition & diagnostics pack? AWR ADDM ASH ASH Analytics SQL Tuning Advisory
- 20. Confidential20 How can wefind them with enterprise edition & diagnostics pack? AWR ADDM ASH ASH Analytics SQL Tuning Advisory
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- 22. Confidential22 Why Standard Editions? Less expensive than enterprise edition (but with less capabilities) What’s the main challenge when it comes to performance diagnosis? • Best performance tuning features are part of Diagnostics & Tuning packs • Diagnostics & Tuning packs – only available with Enterprise Edition
- 23. Confidential23 Which standard editionsare available? 12.1.0.1 and earlier • Standard Edition – support for RAC • Standard Edition One – no support for RAC 12.1.0.2 and above • Standard Edition 2 For more info: http://www.oracle.com/us/products/database/oracle-db-se2-brief-2680836.pdf
- 24. Confidential24 Performance Tuning Challengesfor DBAs Feature No Diagnostics Pack Diagnostics Pack Diagnostics & Tuning Packs Statspack Dictionary Views * (most of them…) AWR х ASH х ASH Analytics х ADDM/Compare Period ADDM х SQL Tuning Advisor х х SQL Access Advisor х х
- 25. Winning Performance Challenges inOracle Standard Editions03
- 26. 26 So what ouroptions when diagnostics pack not available? Statspack - available since Oracle 8i (1998) Dictionary Views (below are my favorites…) • DB statistics – V$SESSTAT, V$SYSSTAT • SQL statistics – V$SQLAREA, V$SQL • Execution plan information – V$SQL_PLAN, V$SQL_SHARED_CURSOR • Object level statistics – V$SEGMENT_STATISTICS • File level statistics – V$FILESTAT • Wait events – V$SESSION, V$SESSION_WAIT, V$SYSTEM_EVENT • Time model statistics – V$SYS_TIME_MODEL, V$SES_TIME_MODEL
- 27. 27 Statspack Oracle 8iand above “Poor man’s AWR” Text based report - no easy navigation Less comprehensive than AWR
- 28. 28 Monitoring locks viaOracle Dictionary Views Cont’d SQL> SELECT DECODE (blocking_session, null, null, 'BLOCKED') status, sid, lmode, request, ctime duration, USER, program, blocking_session, DECODE (request, 0, NULL, SQL_TEXT) SQL_TEXT FROM v$lock l JOIN v$session s USING (sid) LEFT JOIN v$sqlarea USING (sql_id) WHERE block = 1 OR request > 0 ORDER BY status STATUS SID LMODE REQUEST DURATION USER PROGRAM BLOCKING_SESSION SQL_TEXT ----------- ---------- ---------- ---------- ---------- ------- ----------- ---------------------------- ------------------------------------------------ BLOCKED 195 4 5 16581 SALES sqlplus.exe 385 lock table employees in share row exclusive mode BLOCKED 13 0 3 10129 SALES Toad.exe 385 insert into employees values (1, 'Jason') 385 4 0 16575 SALES sqlplus.exe Real-Time Monitoring
- 29. 29 Using Dictionary Views- Example
- 30. 30 Execution Plan Analysis– Estimated vs. Actual GATHER_PLAN_STATISTICS hint DBMS_XPLAN.DISPLAY_CURSOR(FORMAT=>'ALLSTATS LAST') Example:
- 31. 31 Execution Plan Analysis– Example Actual cardinality almost 10 time higher than estimated!
- 32. 32 What are thechallenges with these approaches? Statspack • Text format - less intuitive to navigate compared to AWR html format • Not as feature-rich as AWR Dictionary Views (below are my favorites…) • Limited history • Cumulative statistics - since startup But most importantly… no visualization
- 33. What do thesethree things have in common?
- 34. They all providea clearer perspective - You can’t fix what you can’t see! What if you could… Gain complete visibility into the health and performance of your cross- platform database environments
- 35. Confidential35 Workload Analysis usingOEM ASH Analytics Only with Enterprise Edition + Diagnostics Pack
- 36. Confidential36 Foglight for Databases:Cross Platform Visibility
- 37. Confidential37 Foglight forOracle - the Oracle Diagnostics pack alternative Analysis tool-set for deep visibility into database performance Supports all editions and configurations Remote (“agentless”) collector Supports all database editions and configurations Get Performance Diagnostics Without Spending a Fortune!
- 38. 38 Baseline visualization inFoglight No baseline deviation
- 39. Deep-dive Multi-Dimensional workloadanalysis The alternative to OEM Active Session History Analytics Drilldown, slice, and dice operations Comprehensive set of dimensions
- 40. Investigate Multi-Dimensional wait-events& statistics
- 41. 41 Quickly identifying Blockinglocks issues
- 42. 42 Quickly identifying Blockinglocks issues
- 43. 43 Quickly identifying Blockinglocks issues
- 44. 44 Quickly identifying Blockinglocks issues
- 45. 45 Quickly identifying Blockinglocks issues
- 46. Track Changes &Correlate them with your workload Filter by Execution Plan Changes Correlate between changes to the actual workload See the SQL statements which have new plans
- 47. Compare between differentExecution Plans
- 48. Compare different Instancesor Dimensions
- 49. Compare different Instancesor Dimensions
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- 52. 52 Additional Resources Foglight forOracle Website https://www.quest.com/products/foglight-for-oracle/ Foglight for Oracle Product Overview Video https://youtu.be/J9olUZx3YaQ
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