DB210 Smarter Database IBM Tech Forum 2011
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DB2 10 for z/OS is a new version of IBM's database software that provides significant performance improvements, new security and temporal data features, and easier migration paths from prior versions. Key enhancements in DB2 10 include 5-20% CPU reductions, up to 10x more threads per subsystem due to virtual storage improvements, row and column access controls, and built-in support for tracking historical data. Customers running DB2 8 or 9 can upgrade directly to DB2 10 using new "skip migration" functionality, or upgrade sequentially from earlier versions. Migrating to DB2 10 requires meeting prerequisites and following steps to move to conversion mode and then normal mode.
DB210 Smarter Database IBM Tech Forum 2011
- 1. DB2 10 for z/OS A Smarter Database for a Smarter Planet Julian Stuhler Triton Consulting IBM DB2 Technical Forum 10th March 2011 The Information Management Specialists
- 2. Topics • Introduction • DB2 10 for z/OS Highlights • Migrating to DB2 10 • Summary / Questions Thanks to Roger Miller for providing much of the performance information in this presentation The Information Management Specialists
- 3. Introduction • Director and Principal Consultant at Triton Consulting • 23 years DB2 experience, 18 as a consultant working with customers in UK, Europe and the US • IBM Gold Consultant since 1999 • IBM Information Champion • Former IDUG (International DB2 User Group) President • Author of IBM Redbooks, white papers and more recently “flashbooks” The Information Management Specialists
- 4. DB2 10 for z/OS Highlights The Information Management Specialists
- 5. DB2 10 for z/OS • Extensive beta program running throughout 2009/10, with customers from all around the world • Generally available since October 2010 • First customers now running DB2 10 in production • Many customers are planning their DB2 10 upgrades to begin in the next 12-24 months The Information Management Specialists
- 6. Top New Features • CPU/Performance Improvements • Optimiser enhancements • Virtual Storage Enhancements • MEMBER CLUSTER for UTS • Security Extensions • Backup and recovery • Improved Catalog Concurrency enhancements • Temporal Data • Enhanced audit • Access Path Management • Include additional index columns • pureXML enhancements • Currently Committed semantics • Enhanced SQL OLAP functions • Automated statistics • Skip Migration (see later) • Dynamic schema change enhancements • And many more…. • In-memory object support The Information Management Specialists
- 7. CPU/Performance Improvements The Information Management Specialists
- 8. CPU/Performance Improvements • CPU improvements were one of the major design goals for DB2 10 Many savings available ““Out of the box” with no application or database changes Even more available with some DBA / developer effort • CPU reductions for transactions, queries, and batch CPU reductions of 5-10% for traditional workloads Up to additional 10% CPU savings using new functions CPU reductions of up to 20% for new workloads For static SQL, REBIND typically required The Information Management Specialists
- 9. Performance enhancements requiring few changes (CM) • SQL runtime improved efficiency • Address space, memory changes to 64 bit, some REBINDs • Faster single row retrievals via open / fetch / close chaining • Distributed thread reuse High Performance DBATs • DB2 9 utility enhancements in CM8 • Parallel index update at insert • Workfile in-memory enhancements • Index list prefetch • Solid State Disk use • Buffer pool enhancements Utilize 1MB page size on z10 “Fully in memory” option (ALTER BUFFERPOOL) The Information Management Specialists
- 10. Performance enhancements requiring REBIND (CM) • Most access path • Use of RELEASE(DEALLOCATE) enhancements • Safe query optimization • Further SQL runtime • Query parallelism improvements improvements • SQL paging performance • More stage 2 predicates can be enhancements pushed down to stage 1 Single index access for complex • More aggressive merge of views OR predicates: and table expressions • IN list performance Avoid materialization of views Optimized Stage1 processing (single or multiple IN lists) • If migrating from V8, get new Matching index scan on multiple RUNSTATS before mass rebind IN lists The Information Management Specialists
- 11. Performance enhancements requiring NFM • DB2 catalog concurrency and productivity • Compress on insert • Most utility enhancements • LOB streaming between DDF and rest of DB2 • Faster fetch and insert, lower virtual storage consumption • SQL Procedure Language performance improvements • Workfile spanned records, partition by growth • Access to currently committed data • Insert improvement for universal table spaces • Locking improvement for multirow insert • Efficient caching of dynamic SQL statements with literals The Information Management Specialists
- 12. Performance enhancements which need NFM + DBA work • Hash access path • Index include columns • Inline LOBs • DEFINE NO for LOB and XML columns • MEMBER CLUSTER for universal table space • Alter to universal table space, page size, data set size, segment size • Online reorg for all catalog and directory table spaces The Information Management Specialists
- 13. Virtual Storage Enhancements • V8 began a major project to transform DB2 into a 64-bit RDBMS Laid the groundwork and provided some scalability improvements but a lot of DBM1 objects remained below the 2GB bar • DB2 9 improved things a little, but only by another 10-15% for most customers Practical limit of 300-500 threads per DB2 subsystem • Less DB2 subsystems Lower data sharing overhead • DB2 10 moves 80-90% of the Less systems to manage / maintain remaining objects above the bar, resulting in 5-10x improvement in • More space for critical storage objects such as dynamic statement cache threads per subsystem The Information Management Specialists
- 14. Security Extensions • New authorities introduced to separate data administration and data access Security Administrator (SECADM) System DBA (SYSTEM DBADM) Data Administrator (DATAACCESS) Performance Specialist (SQLADM) • New row and column data access policy controls Fully integrated into database engine Applies to SELECT, INSERT, UPDATE and DELETE The Information Management Specialists
- 15. Security Extensions The Information Management Specialists
- 16. Security Extensions The Information Management Specialists
- 17. Temporal Data • Most IT systems need to keep historical as well as current information • Requires lots of effort by DBA and developer to design, test and implement – lots of “reinventing the wheel” • DB2 10 provides this functionality as part of the database engine, making DBAs and developers more productive DBA indicates which tables/columns need temporal support at CREATE/ALTER time DB2 automatically maintains history table whenever row in main table is changed via INSERT/DELETE/UPDATE Elegant extensions to SELECT allow historical perspective to ben seen via standard SQL The Information Management Specialists
- 18. Temporal Data The Information Management Specialists
- 19. …and if you’re going direct from V8… • pureXML • Network trusted contexts and Roles • Universal tablespaces • Instead-of triggers (PBG/PBR) • Clone tables • Native SQL stored • Automatic object creation procedures • Dynamic schema change • Index on expression enhancements • Reordered row format • SQL MERGE • TRUNCATE TABLE • Utility CPU enhancements • ..and many others • LOB enhancements The Information Management Specialists
- 20. Migrating to DB2 10 for z/OS The Information Management Specialists
- 21. DB2 10 Major Technical Pre-Reqs • z/OS 1.10 or later • At DB2 V8 or DB2 9 in NFM with migration/fallback SPE applied • REBINDs for packages bound at V5 or lower • Replace DBRMs bound directly in plans with packages • Remove all use of private protocol • Prepare for SMS-managed catalog objects • New PLAN_TABLE formats • DB2 client and DB2 Connect 9 9.7 FP3a for function & performance • Convert DB2-managed stored procedures (if migrating from DB2 V8) • … and many more minor ones – check the Install Guide for a full list The Information Management Specialists
- 22. “Normal” Upgrade from DB2 9 • Follows same overall process as DB2 V8 to DB2 9 upgrade Must be in DB2 9 NFM with all DB2 10 technical pre-reqs met Move to DB2 10 CM (Conversion Mode) Move to DB2 10 NFM via ENFM • Support for “rolling upgrade” in data sharing group All members must have pre-migration SPE applied before CM is attempted All members must be at DB2 10 CM before ENFM is attempted • Plan stability feature (PK52523) will be a major advantage for those who have previously suffered from “Rebindaphobia” The Information Management Specialists
- 23. DB2 9 to DB2 10 Upgrade DB2 10 CM* DB2 10 ENFM* (CM9*) (ENFM9*) DB2 9 DB2 10 CM DB2 10 ENFM DB2 10 NFM NFM+SPE (CM9) (ENFM9) (NFM) Fallback to DB2 9 not possible from this Version Fallback point onwards The Information Management Specialists
- 24. “Skip Migration” Upgrade from V8 • DB2 10 is the first release since V7 to support “skip migration” from a previous release Tested by customers as part of the DB2 10 beta program First customer to go with DB2 10 in production used skip migration Rare opportunity for back-level customers to catch up with DB2 release schedule • Risks and benefits must be carefully weighed Must meet prereqs for DB2 9 as well as the new ones for DB2 10 Robust, mature regression test environment is strongly recommended Timing is important, and best practice for applying maintenance is essential Elapsed time and effort for the upgrade project will probably be greater than for a “normal” migration, but less than two separate upgrades Lots of new function to assimilate once upgrade is complete! The Information Management Specialists
- 25. “Skip Migration” Upgrade from V8 • No plan stability features available until DB2 9, so use the old techniques to manage access paths when rebinding on V8 Original package for package stability can be V8 • Follows same overall process as DB2 V8 to DB2 9 upgrade Must be in DB2 8 NFM with all DB2 9 and 10 technical pre-reqs met Move to DB2 10 CM (Conversion Mode) Move to DB2 10 NFM via ENFM • Support for “rolling upgrade” in data sharing group All members must have pre-migration SPE applied before CM is attempted All members must be at DB2 10 CM before ENFM is attempted The Information Management Specialists
- 26. DB2 8 to DB2 10 Upgrade DB2 10 CM* DB2 10 ENFM* (CM8*) (ENFM8*) DB2 8 DB2 10 CM DB2 10 ENFM DB2 10 NFM NFM+SPE (CM8) (ENFM8) (NFM) Fallback to DB2 8 not possible from this Version Fallback point onwards The Information Management Specialists
- 27. Possible DB2 10 Upgrade Strategies Currently On DB2 V7 Upgrade V7 to V8 Upgrade V8 to V10 Just Upgrade V8 to V9 Upgrade V9 to V10 migrated to DB2 V8 Upgrade V8 to V10 On V8 for Upgrade V8 to V9 Upgrade V9 to V10 some time Upgrade V8 to V10 Already on DB2 V9 Upgrade V9 to V10 Jan Apr Jul Oct Jan Jul Oct 2011 2011 2011 2011 2012 2012 2012 November 2011 April 2012 DB2 V8 out The Information Management Specialists DB2 10 GA + 12 months of Support
- 28. DB2 10 Migration Resources • Information APARs II14474: DB2 V8 MIGRATION/FALLBACK INFOAPAR TO/FROM DB2 10 II14477: DB2 9 MIGRATION/FALLBACK INFOAPAR TO/FROM DB2 10 • DSNTIJPM pre-migration checker job http://publib.boulder.ibm.com/infocenter/dzichelp/v2r2/index.jsp?topic=/com.ibm .db29.doc.inst/db2z_dsntijpa.htm • Free migration planning workshops from IBM ftp://ftp.software.ibm.com/software/data/db2/zos/presentations/migration/db2- 10-migration-planning-workshop-trifold.pdf • IDUG DB2 10 Migration Experiences Forum http://www.linkedin.com/groups?mostPopular=&gid=3797589 • IBM DB2 for z/OS Best Practices Web Page www.ibm.com/developerworks/data/bestpractices/db2zos/ • IDUG, IOD, DB2-L, etc The Information Management Specialists
- 29. Further Reading • IBM White Paper DB2 10 for z/OS: A Smarter Database for a Smarter Planet https://www14.software.ibm.com/webapp/iwm/web/sign up.do?lang=en_US&source=sw-infomgt&S_PKG=wp-z- db2-smarter • DB2 10 Performance Topics Redbook on the way The Information Management Specialists
- 30. Feedback / Questions Julian Stuhler– julian.stuhler@triton.co.uk www.triton.co.uk The Information Management Specialists