DB2 Optimization Service Center DB2 Optimization Expert for z/os

Transcription

1 DB2 Optimization Service Center DB2 Optimization Expert for z/os Jay Bruce, Autonomic Optimization Mgr

2 Important Disclaimer THE I NFORMATI ON CONTAI NED I N THI S PRESENTATI ON I S PROVI DED FOR I NFORMATI ONAL PURPOSES ONLY. W HI LE EFFORTS W ERE MADE TO VERI FY THE COMPLETENESS AND ACCURACY OF THE I NFORMATI ON CONTAI NED I N THI S PRESENTATI ON, I T I S PROVI DED AS I S, W I THOUT W ARRANTY OF ANY KI ND, EXPRESS OR I MPLI ED. I N ADDI TI ON, THI S I NFORMATI ON I S BASED ON I BM S CURRENT PRODUCT PLANS AND STRATEGY, W HI CH ARE SUBJECT TO CHANGE BY I BM W I THOUT NOTI CE. I BM SHALL NOT BE RESPONSI BLE FOR ANY DAMAGES ARI SI NG OUT OF THE USE OF, OR OTHERW I SE RELATED TO, THI S PRESENTATI ON OR ANY OTHER DOCUMENTATI ON. NOTHI NG CONTAI NED I N THI S PRESENTATI ON I S I NTENDED TO, OR SHALL HAVE THE EFFECT OF: CREATI NG ANY WARRANTY OR REPRESENTATI ON FROM I BM (OR I TS AFFI LI ATES OR I TS OR THEI R SUPPLI ERS AND/ OR LI CENSORS); OR ALTERI NG THE TERMS AND CONDI TI ONS OF THE APPLI CABLE LI CENSE AGREEMENT GOVERNI NG THE USE OF I BM SOFTWARE. 1

3 Agenda ƒ OSC et OE ƒ Les Advisors ƒ Les Tools 2

4 Family Product Positioning Functions Visual Explain Optimization Service Center Optimization Expert Queries from Catalog, Cache * Query Formatter, Annotation Access Plan Graph Visual Plan Hint Query Statistics Advisor Workload Statistics Advisor Profile based Monitoring ** Query Index Advisor Workload Index Advisor Query Advisor Workload Query Advisor Access Path Advisor * Requires, V8 NFM or higher for Dynamic Stmt Cache ** Requires DB2 9, for z/os NFM for Profile Based Monitoring 3

5 Design Advisors Quick way to identify the cause of performance problem Recommended for all users Four Advisors ¾ Statistics Advisor ¾ Index Advisor ¾ Query Advisor ¾ Access Path Advisor 4

6 Tuning Tools Deep-dive into the root cause of the problem Recommended for expert users DBA Tuning Tools ¾ Query Annotation ¾ Query Report ¾ Visual Explain ¾ Visual Plan Hint ¾ Service SQL 5

7 OSC / OE V1.1 Availability ƒ Optimization Service Center ¾ New no-charge offering ¾ Included in DB2 Accessories Suite for z/os V1.1 ¾ Available via web download: ƒ DB2 Optimization Expert for z/os V1.1 ¾ New One Time Charge (OTC) offering ¾ Value Unit, Reference based pricing ƒ Simultaneous availability with DB2 9 for z/os, March

8 Expanding the Scope and Breadth of Database Monitoring: Optimization Service Center & Optimization Expert SG DBA Tools ƒ Access Plan Graph ƒ Query Annotation w/stats ƒ Detailed Query Report Expert Advice ƒ Runstats ƒ New Indexes ƒ Alternative Queries Visual Plan Hints ƒ Specify new access path ƒ Record a server ƒ Overrides optimizer even for cases where no source code Available at: 7

9 Click to edit Master title style Optimization Expert V1.2 8

10 Optimization Expert V1.2 ƒ Beta Program ¾ 30+ Participants ¾ Beta2 Driver now available to support V8 NFM & CM ¾ Beta3 Driver with new features available in mid Dec. ƒ Many recommendations implemented ¾ Performance Enhancements ¾ Focused Usability studies ¾ New Filter, View, Search, Customization options ƒ Announced march

11 Optimization Expert V1.2 Key Features ƒ Support for, V8 CM and NFM ƒ Capture workloads across Data Sharing group ** ƒ Simplified User Experience ƒ Many new Query and Access Path Advisor Rules ƒ Index Advisor ¾ What if for user specified virtual indexes ¾ User defined Table based priorities ¾ Advanced customization options ƒ Workload Report ƒ Retrieve statements from SQL procedures ƒ Workload import and export ƒ Service Workload ƒ New Filter and View options ƒ Advanced Search features ** Requires, V8 NFM or higher for Dynamic Stmt Cache ** Requires DB2 9, for z/os NFM for Profile Based Monitoring 10

12 Click to edit Master title style Sample screenshots 11

13 Click to edit Master title style Identifying Problem Query 12

14 Identifying Problem Query Welcome Panel 13

15 Identifying Problem Query Dynamic Statement Cache Sources: Cache Catalog QMF QMFHPO Monitor etc. 14

16 Identifying Problem Query Dynamic Statement Cache Extract from Cache 15

17 Identifying Problem Query Dynamic Statement Cache Cached Statements, sorted by descending accumulated CPU time 16

18 Click to edit Master title style Problem Resolution with Design Advisors 17

19 Quick way to identify the cause of performance problem Recommended for all users Four Advisors Statistics Advisor Index Advisor Query Advisor Access Path Advisor 18

20 Tuning Problem Query with Design Advisors Advisors make tuning recommendations 19

21 Tuning Problem Query with Stats Advisor Recommendation Summary RUNSTATS commands Recommendation Explanation 20

22 Tuning Problem Query with Stats Advisor Detailed Recommendation Explanation 21

23 Tuning Problem Query with Query Advisor Recommendation Summary Recommendation Detail Recommendation Explanation 22

24 Tuning Problem Query with Index Advisor Index Recommendation DDL for creating recommended index 23

25 Tuning Problem Query with Access Path Advisor Access Path Warning List Warning Description Corresponding record in PLAN_TABLE Warning Explanation 24

26 Click to edit Master title style Problem Resolution with Tuning Tools 25

27 Deep-dive into the root cause of the problem Recommended for expert users Expert Tuning Tools Query Annotation Query Report Visual Explain Visual Plan Hint Service SQL 26

28 Tuning Problem Query with Tuning Tools Expert tools can be invoked in the same Query Project 27

29 Understanding Query with Query Annotation Original and transformed Query Formatted, reorganized query text Annotations (catalog stats, cost estimation) 28

30 Understanding Query with Query Annotation Two tables with small number of qualified rows. Either one could be the leading table. The most selective local predicate. (FF=2.22E-6) 29

31 Query Report Table Report Two indexes on the table CUSTOMER, but neither contains the column key C_NAME. 30

32 Query Report Predicate Report Three EQUAL join predicates and one EQUAL local predicate on the table CUSTOMER One EQUAL join predicate and one EQUAL local predicate on the table REGION 31

33 Query Report Index Report This index supports index-only scan on the table REGION. These two indexes supports index + fetch scan on the table CUSTOMER. 32

34 Understanding the Access Path with Visual Explain Access Plan Graph Hierarchical Descriptor Structure Detailed Descriptor Attributes 33

35 Implementing Emergency Solution with Visual Plan Hint Default Join Sequence 34

36 Implementing Emergency Solution with Visual Plan Hint Customize the access path using hint 35

37 Click to edit Master title style Capturing Application Workloads 36

38 Solution Problem Query Identification ¾ Snap queries from various sources ¾ Monitor performance exceptions Problem Query Resolution ¾ Design Advisors to recommend stats, index and query design ¾ Tuning tools for deep analysis of problem query Query format to present a readable query Annotate rewritten optimized query with statistics Intelligent report for underlying physical design with critical information Visual explain to show the access path choice Visual optimizer hints to implement emergency solution Service SQL to send relevant doc to IBM for diagnosis Tuning Application Workload ¾ Automatic collection of application queries ¾ Design Advisors for regular health check ¾ Monitor application performance exceptions ¾ Problem resolution with design advisors and tuning tools 37

39 Click to edit Master title style Thank You 38