Upload
others
View
5
Download
0
Embed Size (px)
Citation preview
DBA’s New Best Friend: Oracle Database 10g and 11g S QL Performance AnalyzerPrabhaker Gongloor (GP)Khaled YagoubPete BelknapDatabase Manageability Group
Outline
• SQL Performance Analyzer (SPA) – Introduction• Recommended Testing Methodology• Usage Scenarios
– Evaluating Changes on Production System– 10.2 � 11g DB Upgrade
• SPA Exadata Simulation• SPA Enhancements in Oracle Database 11g Release 2• Conclusion
* Please visit us at the OOW Demogrounds Moscone West – D61/62
SPA Motivation
• Businesses need to adapt to changes to stay competitive, compliant and evolve– DB upgrades, schema, optimizer statistics refresh
– SQL performance regressions: #1 cause of poor system perf.
• Current testing landscape and limitations– Expensive capture, partial workload, non-production optimizer context,
binds– Large workloads (100Ks SQL stmts are common)
– Manual and time consuming testing and regression tuning
– No end-to-end testing solution – Test In Production is not too uncommon
SQL Performance Analyzer (SPA)� Proactively detects ALL SQL regressions, BEFORE actual change is deployed� Integrated comprehensive solution for end-to-end SQL workload testing
SPA Overview
• Helps users predict the impact of system changes on SQL workload response time
• Low overhead capture of SQL workload to SQL Tuning Set (STS) on production system
• Build different SQL trials (experiments) of SQL statements performance by test execution
• Analyzes performance differences
• Offers fine-grained performance analysis on individual SQL
• Integrated with STS, SQL Plan Baselines, & SQL Tuning Advisor to form an end-to-end solution
Analysis Report
Compare
SQL Performance
SQL plans + stats SQL plans + stats
Pre-change Trial Post-change Trial
SQL Workload STS
SQL Trials
• SQL Trials capture execution performance (plans and statistics) of the STS under a given environment
• SPA Trials handle the SELECTS and query part of DML, DDL is skipped
• There are 3 methods to build SQL Trials:
– Execute SQL Locally or Remotely• Test execute statements in actual environment• For remote execution, database link needs to be specified
– Generate Plans Locally or Remotely• Generated execution plans have bind visibility, so better than vanilla
“explain”• Quick way to check if wide-spread changes to SQL plans
– Build from STS• Convert STS to SQL Trial• Use for SQL centric analysis with DB Replay or other testing tools• Use for 9i/10.1 upgrade to higher releases
SPA: Common Usage Scenarios
• Database upgrades and patch-set releases– 9.2/10.1 �10.2 or 11g releases– 10.2.0.x �10.2.0.y or 11g releases
• Optimizer statistics refresh• Database parameter changes• Database schema changes (e.g., add/drop indexes)• Implementation of tuning recommendations• I/O subsystem changes (e.g., ASM, Exadata)
SPA can be used for:� any change that affects SQL execution plan & performan ce� in production as well as test environments
Information for use cases on OTN/ML Note: 560977.1
SPA: Enterprise Manager Interface
• Rich GUI through Enterprise Manager – New workflows added!
• DBMS_SQLPA package PL/SQL API
New Workflows !
Recommended Testing Methodology
Real Application Testing: Recommended Methodology
2. USE DB REPLAY FOR LOAD / CONCURRENCY TESTING
DONE?
No
DEPLOY CHANGE & TUNING
Yes
Yes
No
DONE?
1. USE SPA FOR SQL RESPONSE TIME / UNIT TESTING
Recommended Testing Methodology with SPA
1. CAPTURE REPRESENTATIVE SQL WORKLOAD TO STS
3. MAKE CHANGE, ESTABLISH SQL TRIAL-N
2. ESTABLISH BASELINE (SQL TRIAL-1) WITHOUT CHANGE
4. COMPARE TRIALS & REVIEW SPA REPORT, REMEDIATE
• Reports show deviations from production
NoYes
5. Deploy Change & Tuning to PROD OR
further testing thru DB Replay
• Compare Baseline to Trial-N in the sameenvironment
• For incremental tuning: Compare Trial N-1 to Trial-N
• Test one change at a time to understand causality
DONE?
• Use Production or identical Test System
Usage Scenario: Evaluating Changes On Production
+Parameter
Change
1. 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
How to Minimize Impact on Production?
• Generate Plan Vs Test Execute– Use Generate Plan Trial Method to subset SQL with plan changes– Only test execute SQL with plan changes
• Limit testing scope to private session or schema where possible– Use alter session set <parameter> = <value>; (Vs system)– Example usage for SQL Profiles:
• alter session set sqltune_category= ‘TEST’; – Implement SQL Profiles and test Only sessions with “TEST” sqltune_category
see these Profiles - private scope!!
• alter session set sqltune_category= ‘DEFAULT’; -- Now SQL Profiles visible globally to all sessions
• Similarly for Invisible Indexes, Pending Stats
• Use SPA time limit to control resource usage
• Test during maintenance window or non-peak activity when spare resources are available
Using SPA on Production: Evaluating Optimizer Statistics Refresh and other changes
Scenario:Can I use SPA to check if any SQL statements
regressed due to optimizer statistics refresh on my 10.2/11g production databases? If so, how?
Goal:Assess impact of optimizer statistics gathering
on SQL workload performance on production system using SPA & make sure are no negative effects of the change
Evaluating Optimizer Statistics Refresh
• Assumptions– Statistics refreshed periodically through custom jobs– No test system available, so evaluation is done on production– Should impact end-users minimally– Test using optimizer pending statistics feature
• Use SPA remote trials capability (generate plan and test execute) to evaluate statistics refresh on 10.2/11g production database
• Analyze SPA report and take appropriate action– Overall improvement but few SQL regressions
• Solution: Use SQL Profiles or Plan Management – No improvement and many regressions
• Solution: Revert to old statistics: Use optimizer statistics retention/history feature. Alternatively, configure optimizer statistics appropriately*
– For Oracle Database 11g, “publish pending” statistics after evaluation of statistics
OBE Tutorial on OTN: Gathering and Publishing Stats Independently
Using SPA on Production: Evaluating Optimizer Statistics Refresh
Production Database (10.2/11g)
11g SPA System
1. Capture SQL workload to STS
Prod: Before Stats
Prod: Stats Refreshed
Evaluate Opt Statistics Refresh
5. Publish Pending Stats and Remediate Regressions
Remotely Build SQL Trials
No Test Database Used!!
3. Gather Pending Stats
2. Import STS
4.Use SPA to detect performance changes
• No app schema/data necessary
• Not Mandatory for 11g db
• Repository for many tests!
Evaluating Optimizer Statistics Refresh
• Tips!
– On production, first use SPA to generate execution plans only, then test-execute SQLs with changed plans
– If you’re creating remote trials, you will need a logon trigger to set optimizer_use_pending_statistics = TRUE private to the second trial (SPA establishes the connection itself, over db link, so you cannot run alter session yourself)
– To test-execute only those SQLs with changed plans, subset your STS after doing trial 2, then do a new SPA experiment on that STS
• Script to subset STS is on Notes slide
Usage Scenario: End-to-End Case Study for 10.2 ���� 11g
Upgrade
10.2 ����11g DB Upgrade Using Enterprise Manager Grid Control (EMGC) 10.2.0.5
Scenario:I want to upgrade from 10.2 to 11g database release to
benefit from 11g functionality. How can I best accomplish the upgrade?
Goal:Assess impact of upgrade on SQL workload performance
using SPA so that there are no surprises after upgrade. Once migrated to 11g new features can be enabled one at a time. Use EMGC 10.2.0.5 for this purpose…
10.2 ���� 11g DB Upgrade
Production Database
11g SPA System
1. Capture SQL workload to STS
Upgrade
Test Database
Test DB (11g)
Upgrade
Test DB (10.2)
Collect execution stats
3. Establish 10.2 and 11g Trials
4. Compare performance and generate SPA report
Send SQL for Remote Execution
Prod DB (10.2)
2. Transport STS
5. Deploy Tuning and Change to Prod
10.2 ���� 11g DB Upgrade(1) Capture Workload to STS
Steps 1: Capture workload into STS through Incremental Capture Workload into STS: Preferred method Other sources for STS also possible: Top SQL in AWR / AWR Baseline
10.2 ���� 11g DB Upgrade(1) Capture Workload to STS
10.2 ���� 11g Upgrade
1. Capture SQL workload to STS
3. Establish 10.2 and 11g Trials
2. Transport STS
4. Compare performance and Generate SPA report
5. Deploy Tuning and Change to Prod
Step 2:• Copy STS to SPA system• Setup Test DB (Copy of Prod) – 10.2• Upgrade Test DB from 10.2 to 11g
10.2 ���� 11g DB Upgrade (2) Transport STS
10.2 ���� 11g DB Upgrade
1. Capture SQL workload to STS
3. Establish 10.2 and 11g Trials
2. Transport STS
4. Compare performance and Generate SPA report
5. Deploy Tuning and Change to Prod
10.2 ���� 11g DB Upgrade (3) Establish 10.2 and 11g Trials
10.2 ���� 11g Upgrade
1. Capture SQL workload to STS
3. Establish 10.2 and 11g Trials
2. Transport STS
4. Compare Performance, Generate SPA Report
5. Tune Regressions, Deploy Tuning and Change to Prod
10.2 ���� 11g DB Upgrade (4) Compare Performance and Generate Report
4
1
3
2
5*
Note tuning/regression fix is done on remote test
system that is being upgraded
SPA Report Regressed SQL Statements
10.2 ����11g Upgrade
1. Capture SQL workload to STS
3. Establish 10.2 and 11g Trials
2. Transport STS
4. Compare performance and Generate SPA report
5. Tune Regressions, Deploy Tuning and Change to Prod
10.2 ���� 11g DB Upgrade (5) Regression Remediation
• If SPA system has application data/schema, tuning can be done locally on the same DB
• If a separate SPA system is used, manually* subset SQL into a separate STS and then use EM to transport it to remote DB
• Create SQL Plan Baselines: Helps revert to previously known, stable plans
• SQL Tuning Advisor: Helps explore better execution plans
• All regressed SQL are targeted automatically for remediation
* Code snippet in Real Application Testing Users Gu ide (11.2), Chapter 11 Page 23
10.2 ���� 11g DB Upgrade (5) Regression Remediation
10.2 ���� 11g DB Upgrade(5) Deploy Tuning and Change in Production
10.2 ���� 11g Upgrade
1. Capture SQL workload to STS
3. Establish 10.2 and 11g Trials
2. Transport STS
4. Compare performance and Generate SPA report
5. Tune Regressions, Deploy Tuning and Change to Prod
SPA Exadata Simulation: Estimating Exadata Server Performance Gains
Predicting performance gains with SPA
• Existing SPA and Database Replay functionality can be used to compare non-Exadata to Exadata configurations – SPA: Unit test to find SQL response time gains– DB Replay: Stress test with concurrency to find throughput gains– Measure improvements for your workload– This approach requires you to provision Exadata HW
• Oracle Database Release 11.1.0.7: Adds SPA functionality to simulate Exadata on existing hardware to predict gains
• Oracle Database Release 11.2: Adds SPA GUI support
• Simulation measures reduction in I/O interconnect usage that will in turn, reduce IO and CPU consumed on the DB server
SPA Exadata SimulationWorkflow
• SPA Exadata Simulation builds two SQL Trials:• Trial 1: Current configuration with No Exadata• Trial 2: Current configuration with Exadata simulation
• Comparison metric – I/O Interconnect Bytes– Trial 1 value = I/O Interconnect (disk) bytes– Trial 2 value is reduced depending on SQL operation
eligibility (for full table scans, index full scans, etc.)– Plans will not change between trials
SPA Exadata Simulation Workflow
SPA Exadata Simulation: Report
SPA Report: SQL Details
SPA Enhancements in Oracle Database 11 g Release 2
SPA Enhancements: Oracle Database 11g Release 2
• Multiple test executes for better trial accuracy – first execution ignored, averaged stats
• Alternate Plans: New recommendation added for regression remediation– If a better execution plan was noticed in AWR or baseline SQL Trial
then a SQL Plan Baseline can be created from it
• Active Reports– New interactive, offline reports based on Adobe Flash Player UI– Customers can share reports internally or with Oracle Support
• Save, email, View Reports• Support can diagnose problems more efficiently• Get EM UI without installing EM – useful for packaged apps and
internal development teams– SPA Active Report Example
SPA Enhancements: Oracle Database 11g Release 2 Using SPA With Other Testing Tools – Build Trials from STS
• Allows comparing two different STS and generate SPA report– Eliminates re-executing SQL for trial data– Performance statistics picked up from the STS– Multiple plans even those with different binds/env picked up for comparison
• Use cases: Perform SQL-centric analysis– Database Replay
• SQL workload capture into STS-1 during Database Replay - Workload Capture
• STS-2 during Database Replay – Workload Replay• Use SPA to build trials from STS-1 and STS-2 and generate report
– Similarly with Oracle Application Testing Suite or home-grown scripts
• Reporting: SPA Report + Additional information– Common SQL, Missing/New SQL, Plan Changes– Overall Workload and Individual SQL Statistics– Available in 11.2 database release, API only
Conclusion
• SPA provides comprehensive and easy-to-use solution for SQL workload testing
• SPA can be used for many changes both test and production environments
• Helps adopt technology faster by significantly cutting down testing costs and production deployment risk
• With SPA and Real Application Testing businesses can be stay competitive and improve profitability
10.2 ���� 11g DB Upgrade(1) Capture Workload to STS
10.2 ���� 11g DB Upgrade(1) Capture Workload to STS
No EM in your environment, use API:
EXEC DBMS_SQLTUNE.CAPTURE_CURSOR_CACHE_SQLSET(
sqlset_name => 'my_sts', time_limit => 24*60,
repeat_interval => 5);
10.2 ���� 11g DB Upgrade (2) Transport STS
Make sure directory object exists on Prod
and Test DB
Make sure directory object exists on Prod
and Test DB
Make sure all the sub-steps succeed
Make sure all the sub-steps succeed