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Copyright © 2012, Oracle and/or its affiliates. All rights reserved.1
Maximize your Database
Performance
Find, Fix and Val...
Copyright © 2012, Oracle and/or its affiliates. All rights reserved.2
Agenda
 Database Performance Analysis
– Challenges ...
Copyright © 2012, Oracle and/or its affiliates. All rights reserved.3
Database Performance Analysis
Challenges
•Reported b...
Copyright © 2012, Oracle and/or its affiliates. All rights reserved.4
• For problem diagnosis
use ADDM, EM
Performance
• A...
Copyright © 2012, Oracle and/or its affiliates. All rights reserved.5
Boost Administrator
Productivity
Eliminate Performan...
Copyright © 2012, Oracle and/or its affiliates. All rights reserved.6
Performance Issues Automatically Diagnosed by ADDM
T...
Copyright © 2012, Oracle and/or its affiliates. All rights reserved.7
Real-Time ADDM—Architecture
• Makes a lightweight co...
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Real-Time ADDM
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Compare Period ADDM
• Full ADDM analysis across two ...
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Compare Period ADDM: Method
• Identify what changed...
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Compare Period – 3 Modes
One snapshot offset
System...
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Compare Period: Report
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Active Session History (ASH)
All ‘Active’ sessions ...
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Drilling into Logical Dimensions
ASH
SQL
PL/SQL
Res...
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ASH Analytics
Flexible Time Picker
Flexible Activit...
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• Seamless integration
between Find and Fix
• In-de...
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SQL Problems
 Bind-sensitive SQL with bind peeking...
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SQL Tuning Advisor
SQL Tuning Advisor
Identifies al...
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Application Tuning
Automatic SQL Tuning
Automatic S...
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SQL Access Advisor
Automatic Tuning
Optimizer
SQL
C...
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Real-Time SQL Monitoring
Looking Inside SQL Executi...
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SQL Monitoring Details
Expensive Hash Join
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Real-Time PL/SQL Monitoring
PL/SQL execution no
lon...
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Performance Diagnostics
Active Reports
Interactive ...
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D E M O N S T R A T I O N
Automatic SQL Tuning
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D E M O N S T R A T I O N
Monitoring SQL Statements
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• End-to-end SPA
workflow using
Optimizer Statisti...
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Real Application Testing
SQL Performance Analyzer ...
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SPA Analysis Report Example
4
1
3
2
5
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SPA Report
Regressed SQL Statements
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Usage Scenario: Evaluating Changes On
Production
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+Parameter
Change
Fix Regression thru
SPM
+Add
ind...
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When to use SPA?
• Optimizer Statistics
• Database...
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D E M O N S T R A T I O N
SQL Access Advisor & SQL...
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Advanced Databases Performance Analysis
Solution
•...
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Resources
 Oracle Enterprise Manager 12c:
http://...
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Findfixandvalidate 140221013443-phpapp01

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Findfixandvalidate 140221013443-phpapp01

  1. 1. Copyright © 2012, Oracle and/or its affiliates. All rights reserved.1 Maximize your Database Performance Find, Fix and Validate Jesús Leonardo Robles DB & O Business Development Manager Valentín Leonard Tabacaru Presales Technology Consultant
  2. 2. Copyright © 2012, Oracle and/or its affiliates. All rights reserved.2 Agenda  Database Performance Analysis – Challenges and Solutions  1.- Find  2.- Fix  3.- Validate  Resources
  3. 3. Copyright © 2012, Oracle and/or its affiliates. All rights reserved.3 Database Performance Analysis Challenges •Reported by end users •Discovered by daily checks •Reactive to end-users Find? •Relate symptom to possible cause •Relate possible cause to probable metric •Implement change Fix? •Did it work? •End-user feedback? •Run reports on metric Validate? •Will it occur again? •Custom script to watch for the metric •Complex alerting and notification Track? 1 2 3 4
  4. 4. Copyright © 2012, Oracle and/or its affiliates. All rights reserved.4 • For problem diagnosis use ADDM, EM Performance • ADDM reveals significant problems including problematic SQL details and recommendations improve to performance • ADDM family – Compare Period, Real- Time ADDM 1 – Find: Diagnostics
  5. 5. Copyright © 2012, Oracle and/or its affiliates. All rights reserved.5 Boost Administrator Productivity Eliminate Performance Bottlenecks Lower IT Management Costs Deliver Higher Quality of Service Automatic Performance Diagnostics Maximize Performance With Self-Managing Database • Sustain maximum performance with self-managing database • Top-down analysis using Automatic Workload Repository snapshots • Real-time performance analysis with Automatic Database Diagnostic Monitor • Resolve performance issues faster with drill-down root-cause analysis • Classification tree based on Oracle performance tuning expertise • Performance expert; now a RAC specialist too in Oracle Database 11g Automatic Workload Repository Snapshots Performance & Management Advisors High Load SQL RAC Issues IO / CPU Issues Self-Diagnostic Engine
  6. 6. Copyright © 2012, Oracle and/or its affiliates. All rights reserved.6 Performance Issues Automatically Diagnosed by ADDM Top SQL I/O Issues Parsing Configuration Issues Application Usage Excessive Logon/Logoff Undersized Memory Hot Blocks and Objects RAC Service Issues Locks & ITL contention Checkpoint causes PL/SQL, Java Time
  7. 7. Copyright © 2012, Oracle and/or its affiliates. All rights reserved.7 Real-Time ADDM—Architecture • Makes a lightweight connection without acquiring additional locks and resources, bypassing the SQL layer through the agent • Also attempts to initiate standard JDBC connection • Data returned by either connection is analyzed by Real-Time ADDM EM Agent JDBC Connection Diagnostic Connection ADDM Analysis Database Resource Constraints Hangs Memory Issues Resource Limits Reached Deadlocks Top Issues Identified by Real-Time ADDM
  8. 8. Copyright © 2012, Oracle and/or its affiliates. All rights reserved.8 Real-Time ADDM
  9. 9. Copyright © 2012, Oracle and/or its affiliates. All rights reserved.9 Compare Period ADDM • Full ADDM analysis across two AWR snapshot periods • Detects causes, measure effects, then correlates them • Causes: workload changes, configuration changes • Effects: regressed SQL, reach resource limits (CPU, I/O, memory, interconnect) • Makes actionable recommendations along with quantified impact AWR Snapshot Period 1 AWR Snapshot Period 2 Analysis ReportCompare Period ADDM SQL Commonality Regressed SQL I/O Bound Undersized SGA
  10. 10. Copyright © 2012, Oracle and/or its affiliates. All rights reserved.10 Compare Period ADDM: Method • Identify what changed • DB configurations, workload changes • Quantify performance differences • Uses DB Time as basis for measuring performance • Identify root cause • Correlate performance differences with changes Did the Buffer cache get smaller? Why is there 10% new SQL? Why Top SQL increased by 45%? Read I/O are up by 55%, why? Did a buffer cache reduction cause a read I/O increase?
  11. 11. Copyright © 2012, Oracle and/or its affiliates. All rights reserved.11 Compare Period – 3 Modes One snapshot offset System moving window Customized period
  12. 12. Copyright © 2012, Oracle and/or its affiliates. All rights reserved.12 Compare Period: Report
  13. 13. Copyright © 2012, Oracle and/or its affiliates. All rights reserved.13 Active Session History (ASH) All ‘Active’ sessions captured every second • Foregrounds and backgrounds are sampled • Active foregrounds contribute to DB Time In-memory: V$ACTIVE_SESSION_HISTORY • Sampling interval = 1 second On-disk: DBA_HIST_ACTIVE_SESS_HISTORY • Sampling interval = 10 seconds ASH is a system-wide record of database activity • A FACT table with multiple dimensions that help diagnose performance issues
  14. 14. Copyright © 2012, Oracle and/or its affiliates. All rights reserved.14 Drilling into Logical Dimensions ASH SQL PL/SQL Resource Usage Session Identifiers Session Attributes SQL SQL ID Plan Hash Operation OpCode PL/SQL PL/SQL Top Level PL/SQL Resources Wait Class Wait Event Object Blocking Session Identifiers Instance Services User Session Parallel Process Program Session Type Attributes Cons. Group Module Action Client Trans. ID
  15. 15. Copyright © 2012, Oracle and/or its affiliates. All rights reserved.15 ASH Analytics Flexible Time Picker Flexible Activity Chart Flexible Top Chart Flexible Top Chart
  16. 16. Copyright © 2012, Oracle and/or its affiliates. All rights reserved.16 • Seamless integration between Find and Fix • In-depth analysis and recommendation of the fix • Gather statistics for this example… • How would we validate this changes? 2 – Fix: Tuning
  17. 17. Copyright © 2012, Oracle and/or its affiliates. All rights reserved.17 SQL Problems  Bind-sensitive SQL with bind peeking  Literal usage CURSOR SHARING Cursor Sharing Issues  Hardware resource crunch  Contention (row lock contention, block update contention)  Data fragmentation Resource & Contention Issues RESOURCES  Stale/Missing statistics  Incomplete statistics  Improper optimizer configuration  Upgraded Database: new optimizer  Changing statistics  Rapidly changing data STATISTICS Optimizer Statistics Issues  Missing access structures  Poorly written SQL statementsApplication Issues APPLICATIONS  Not parallelized (no scaling to large data)  Improperly parallelized (partially parallelized, skews)Parallelism Issues PARALLELISM
  18. 18. Copyright © 2012, Oracle and/or its affiliates. All rights reserved.18 SQL Tuning Advisor SQL Tuning Advisor Identifies alternate execution plans using real-time and historical performance data Recommends parallel profile if it will improve SQL performance significantly (2x or more) SQL Profiling Statistics Analysis Access Path Analysis SQL Restructure Analysis Alternative Plan Analysis Parallel Query Analysis Automatic Tuning Optimizer Administrator SQL Tuning Recommendations Gather Missing or Stale Statistics Create a SQL Profile Add Missing Access Structures Modify SQL Constructs Adopt Alternative Execution Plan Create Parallel SQL Profile SQL Tuning Advisor
  19. 19. Copyright © 2012, Oracle and/or its affiliates. All rights reserved.19 Application Tuning Automatic SQL Tuning Automatic SQL Tuning •Captures high-load SQL •Tunes SQL using SQL Profiles •Implements improved SQL plans (optional) Performance benefit of advice provided SQL Profiling tunes execution plan without changing SQL text Enables transparent tuning for packaged applications Applications High-Load Packaged Apps + SQL Profile Customizable Apps + SQL Advice Customizable Apps + Indexes & MVs + Partitions Tuned SQL Automatic Tuning Optimizer
  20. 20. Copyright © 2012, Oracle and/or its affiliates. All rights reserved.20 SQL Access Advisor Automatic Tuning Optimizer SQL Cache SQL Tuning sets SQL Access Advisor Indexes Materialized Views Materialized Views Logs Partitioned Objects SQL Access Advisor • Capture SQL Workload from multiple sources Set filters on the Workload SQL Access Recommendations
  21. 21. Copyright © 2012, Oracle and/or its affiliates. All rights reserved.21 Real-Time SQL Monitoring Looking Inside SQL Execution Guides tuning effortsAutomatically monitors long running SQL Enabled out-of-the-box with no performance impact Monitors SQL execution Exposes monitoring statistics Global execution level Plan operation level Parallel Execution level
  22. 22. Copyright © 2012, Oracle and/or its affiliates. All rights reserved.22 SQL Monitoring Details Expensive Hash Join
  23. 23. Copyright © 2012, Oracle and/or its affiliates. All rights reserved.23 Real-Time PL/SQL Monitoring PL/SQL execution no longer a “black box” •Answers questions like “why did my DBMS_STATS job take twice as long this time?” Shows global (PL/SQL) and SQL level statistics Each SQL called by PL/SQL recursively monitored Drill-down to slow SQL for diagnosing unexpected PL/SQL behavior
  24. 24. Copyright © 2012, Oracle and/or its affiliates. All rights reserved.24 Performance Diagnostics Active Reports Interactive reports for off-line analysis Drill-downs for detailed analysis Can be emailed for analysis Does not require Oracle Enterprise Manager installation
  25. 25. Copyright © 2012, Oracle and/or its affiliates. All rights reserved.25 D E M O N S T R A T I O N Automatic SQL Tuning
  26. 26. Copyright © 2012, Oracle and/or its affiliates. All rights reserved.26
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  95. 95. Copyright © 2012, Oracle and/or its affiliates. All rights reserved.95
  96. 96. Copyright © 2012, Oracle and/or its affiliates. All rights reserved.96 D E M O N S T R A T I O N Monitoring SQL Statements
  97. 97. Copyright © 2012, Oracle and/or its affiliates. All rights reserved.97
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  173. 173. Copyright © 2012, Oracle and/or its affiliates. All rights reserved.173 • End-to-end SPA workflow using Optimizer Statistics • Seamless integration from Find to Fix to Validate to Implement with confidence • No more guesswork 3 – Validate: SPA
  174. 174. Copyright © 2012, Oracle and/or its affiliates. All rights reserved.174 Real Application Testing SQL Performance Analyzer (SPA) SQL Workload STS SQL Plans + Run-time Stats Pre-Change Trial SQL Plans + Run-time Stats Post-Change Trial Compare SQL Performance Analysis Report • Test and predict impact of system changes on SQL query performance • Analyze performance changes for improvements and regressions • Comprehensive performance analysis and reporting • Re-execute SQL queries in the given environment • End-to-end solution: STS, SQL Plan Baselines, and SQL Tuning Advisor
  175. 175. Copyright © 2012, Oracle and/or its affiliates. All rights reserved.175 SPA Analysis Report Example 4 1 3 2 5
  176. 176. Copyright © 2012, Oracle and/or its affiliates. All rights reserved.176 SPA Report Regressed SQL Statements
  177. 177. Copyright © 2012, Oracle and/or its affiliates. All rights reserved.177 Usage Scenario: Evaluating Changes On Production
  178. 178. Copyright © 2012, Oracle and/or its affiliates. All rights reserved.178 +Parameter Change Fix Regression thru SPM +Add indexes Using SPA For Changes in Production: Example Fix Regression SQL Profile Prod +SQL Profile +New Stats Change +Partitioning +Validate Tuning Parameter change was bad in this case And so on… +Index Unusable • Bubble following the arrow indicates the delta change on Production • SPA is used for testing every change
  179. 179. Copyright © 2012, Oracle and/or its affiliates. All rights reserved.179 When to use SPA? • Optimizer Statistics • Database parameter changes • Database schema changes (e.g., add/drop indexes) • Implementation of tuning recommendations • I/O subsystem changes (e.g., ASM, Database Machine) • For consolidation (schema, CDB/PDB) • On test, standby, and production environments • Extended to home-grown scripts, application specific database changes, third-party testing tools using STS compare analysis • Supports most applications - EBS, SAP, Siebel, home-grown, etc SPA Provides Broad Testing Coverage • My Oracle Support (MOS) Note: 560977.1 • 9.2/10.1 10.2 or 11g or 12 releases • 10.2.0.x 10.2.0.y or 11g or 12 releases SPA Provides Testing in Various Database Releases
  180. 180. Copyright © 2012, Oracle and/or its affiliates. All rights reserved.180 D E M O N S T R A T I O N SQL Access Advisor & SQL Performance Analyzer
  181. 181. Copyright © 2012, Oracle and/or its affiliates. All rights reserved.181
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  273. 273. Copyright © 2012, Oracle and/or its affiliates. All rights reserved.273
  274. 274. Copyright © 2012, Oracle and/or its affiliates. All rights reserved.274 Advanced Databases Performance Analysis Solution • Built-in, self-diagnostics engine: Automatic Database Diagnostics Monitor (ADDM) (Diagnostics Pack) Find • Automates complex and time consuming task of application tuning (Tuning Pack) Fix • Validates tuning and “what-if” activities (Real Application Testing) Validate • Extend EM out-of-box metrics - Can be defined for any target type, including applications (Metric Extensions) Track
  275. 275. Copyright © 2012, Oracle and/or its affiliates. All rights reserved.275 Resources  Oracle Enterprise Manager 12c: http://www.oracle.com/us/products/enterprise-manager  Oracle Enterprise Manager 12c Database Management http://www.oracle.com/technetwork/oem/db-mgmt  Database Manageability and Real Application Testing: http://www.oracle.com/technetwork/database/manageability  Oracle Enterprise Manager on Beehive Online Downloadable Technical Assets oracle12c_es@oracle.com mailing list for support
  276. 276. Copyright © 2012, Oracle and/or its affiliates. All rights reserved.276
  277. 277. Copyright © 2012, Oracle and/or its affiliates. All rights reserved.277

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