DB2 z/OS & Java - What\'s New?
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The document discusses the integration of Java with DB2 for z/OS, highlighting Java's benefits such as portability and support from IBM, as well as the challenges it faces in database interactions. It introduces PureQuery as a new solution to improve performance and flexibility in Java application development while outlining recent enhancements in DB2 for better support of Java applications. The presentation concludes with an overview of DB2's features relevant to Java, emphasizing ongoing development efforts and the importance of efficient database access.
DB2 z/OS & Java - What\'s New?
- 1. DB2 for z/OS and Java What’s New? Julian Stuhler DB2Night Show September 2011
- 2. Agenda Introduction Java Overview Java & DB2: Benefits and Challenges So, What’s New? Conclusion & Summary 2 DB2Night Show © © 2011 Triton Consulting Ltd
- 3. Your Presenter – Julian Stuhler DB2 consultant with Triton Consulting, based in the UK 25 years DB2 experience • Database Administration • Systems Programming • Application Development IBM Gold Consultant IBM Information Champion IDUG Best Speaker Redbook – DB2 Java Stored Procedures, Learning by Example IDUG Past President 3 DB2Night Show © © 2011 Triton Consulting Ltd
- 4. Java Overview DB2Night Show © © 2011 Triton Consulting Ltd
- 5. What is Java? Java is a programming language • Object oriented • Derivative of C++ with simpler syntax and more robust memory management • Code is compiled to architecture neutral byte-code • Secure –built-in controls for preventing malicious code • Portable – device and OS independent 5 DB2Night Show © © 2011 Triton Consulting Ltd
- 6. What is Java? Java is a runtime environment (aka platform) with 2 major components • A Java Virtual Machine (JVM), which runs Java code and insulates it from myProg.java underlying hardware / OS Interprets portable Java byte code and Java API JVM translates to underlying platform- specific instructions Can be supplied by the web browser, Hardware / Operating System operating system or middleware (such as Websphere Application Server) • A Java API, which provides a collection of ready-made Java software components for common functions 6 DB2Night Show © © 2011 Triton Consulting Ltd
- 7. What is Java? Java is a development environment • JDK (Java Development Kit) provides the tools necessary to develop and test a Java program 7 DB2Night Show © © 2011 Triton Consulting Ltd
- 8. Java In The Enterprise IBM and other enterprise vendors have emphatically endorsed Java • Good fit with IBM’s “open” approach and On Demand strategy • Great counter to Microsoft’s .net Many organisations have adopted Java as the (or one of the) primary application development technologies • Good availability of skilled programming resource • Portability 8 DB2Night Show © © 2011 Triton Consulting Ltd
- 9. Java In The Enterprise Huge effort within IBM in recent years to support Java as a primary application development environment • Hardware support (IFL, zAAP, zIIP, zEnterprise) • Operating System support (USS, Java SDK for z/OS) • Software licensing (IFL) • Middleware development (DB2, Websphere, etc) • Application development tools (Websphere studio, RAD, Eclipse) • Consulting services 9 DB2Night Show © © 2011 Triton Consulting Ltd
- 10. Java & DB2: Benefits and Challenges DB2Night Show © © 2011 Triton Consulting Ltd
- 11. Java & DB2: Benefits Good fit to each technology’s strengths • Java runs well on most “application server” hardware platforms • DB2 offers best-of-breed data serving capabilities (resilience, scalability, integrity) Availability of developer skills compared to “legacy” languages • May change in future – see next slides… Portability Mature DB2 driver architecture Ongoing enhancements to DB2 to make it more “Java friendly” DB2Night Show © © 2011 Triton Consulting Ltd
- 12. Java & DB2: Benefits Java programs can access DB2 data using the IBM Data Server Driver for Java with… • … one of the Java database • … one of two Java APIs connection interface calls JDBC DriverManager SQLJ DataSource pureQuery • … one of the two driver connection types Type 2 (local) Type 4 (remote) DB2 stored procedures and User Defined Functions can also be written in Java pureQuery gives further options – see later 12 DB2Night Show © © 2011 Triton Consulting Ltd
- 13. Java & DB2: Challenges JDBC = Dynamic SQL • Performance • Response time consistency • Authorisation • Monitoring & Accounting (same package for all) • DBM1 Virtual storage (MAXKEEPD) Developer skills • Ironically, many educational establishments now consider Java to be an enterprise language, so it is becoming less fashionable to teach 13 DB2Night Show © © 2011 Triton Consulting Ltd
- 14. Java & DB2: Challenges Impedance Mismatch • Java is an Object Oriented language • Relational databases such as DB2 deal with tables and columns • Mismatch requires mapping between the two Customer Customer Telephone Address Number Customer Java Object Customer DB2 Tables 14 DB2Night Show © © 2011 Triton Consulting Ltd
- 15. Java & DB2: Challenges Cultural Silos • Many Java developers don’t know (or care) much about the way the back-end database operates – black box approach • Many DBAs don’t understand Java/OO development (e.g. may come from a more traditional COBOL development background) 15 DB2Night Show © © 2011 Triton Consulting Ltd
- 16. Java & DB2: Challenges Java Frameworks are designed to improve developer productivity • Provide standard functions/facilities • Promote re-use • Free the developer from directly coding lower-level functions such as data access by adding (another) abstraction layer Data access frameworks (aka “persistence frameworks”) deal with access to relational databases 16 DB2Night Show © © 2011 Triton Consulting Ltd
- 17. Java & DB2: Challenges Popular Java data access frameworks • iBatis • Hibernate • JDO • JPA • TopLink Many of these interoperate so multiple frameworks can be used at once • E.g. The Spring framework can use all of the above data access frameworks 17 DB2Night Show © © 2011 Triton Consulting Ltd
- 18. Java & DB2: Challenges Framework issues • Developer will use framework’s own query language, which will be used to generate SQL • Potential performance issues • Potential problem diagnosis issues 18 DB2Night Show © © 2011 Triton Consulting Ltd
- 19. Break 19 DB2Night Show © © 2011 Triton Consulting Ltd
- 20. So, What’s New? DB2Night Show © © 2011 Triton Consulting Ltd
- 21. pureQuery - Proposition JDBC has performance challenges Java Application SQLJ is not well understood by traditional Java developers, and not well supported by tooling Named Queries Query Language Other solutions (Hibernate, Spring, iBatis, etc) are more OR Mapping Layer popular with Java developers but reduce flexibility and make SQL problem diagnosis and tuning Persistence Layer difficult A solution is required that combines the flexibility of Hibernate/iBatis with the DB2 efficiency of SQLJ 21 DB2Night Show © © 2011 Triton Consulting Ltd
- 22. pureQuery – Components pureQuery is part of the Optim brand, and consists of the following elements • A set of APIs for efficient access to relational data • Eclipse-based tooling for Java and SQL development, delivered in Optim Development Studio – chargeable option, separate components targeted at z/OS and LUW • pureQuery runtime – chargeable option, separate components targeted at z/OS and LUW 22 DB2Night Show © © 2011 Triton Consulting Ltd
- 23. pureQuery - APIs Intended to boost productivity and use best practices for RDBMS access Aimed at new applications – API calls embedded directly in Java code • An alternative API to JDBC and SQLJ, although the same low-level access functions are used Uses SQL directly in API calls – no alternative query language Choice of static SQL or dynamic SQL variants Supports several API styles to fit well into all of the popular Java programming models/frameworks • Inline style (familiar JDBC and SQLJ approach) • Method style (similar to JDBC 4 ease of use enhancements) • Named query style (similar to iBatis / Hibernate) Supported by Optim Development Studio 23 DB2Night Show © © 2011 Triton Consulting Ltd
- 24. pureQuery – Development Tools Optim Development Studio (ODS) • Previously known as IBM Data Studio Developer • Eclipse based • Supports DB2, IDS and Oracle development • Integrates with other IBM tools (RAD, InfoSphere Data Architect, etc.) • Generate pureQuery access code direct from database objects • SQL assist • Front-end for pureQuery monitoring and runtime components • Dynamic SQL substitution to replace poor SQL • Approx $850 per seat 24 DB2Night Show © © 2011 Triton Consulting Ltd
- 25. pureQuery – Runtime Allows dynamic SQL (e.g JDBC calls) to be intercepted and replaced with static SQL at runtime • Process known as “client optimisation” Major Features • Allows dynamic SQL to be executed statically, with associated performance/security advantages • No code changes needed • Works for both Java and .Net applications • Can handle parameter markers in SQL • Targeted against DB2, Informix and Oracle back-end databases Internal IBM testing shows up to 40% CPU savings for T2 applications, and 15-25% for T4 – your mileage may vary! 25 DB2Night Show © © 2011 Triton Consulting Ltd
- 26. pureQuery – Runtime Source: IBM White Paper, IBM Optim pureQuery Runtime for z/OS Performance Running IRWW workload 26 DB2Night Show © © 2011 Triton Consulting Ltd
- 27. DB2 9 for z/OS GA in early 2007 Many new features of interest from a Java/Websphere perspective • Native XML support for Java applications • Optimistic locking • Network trusted contexts • BIGINT, VARBINARY and BINARY data types 27 DB2Night Show © © 2009 Triton Consulting Ltd
- 28. Network Trusted Contexts 28 DB2Night Show © © 2009 Triton Consulting Ltd
- 29. DB2 10 for z/OS New release of DB2 for z/OS went GA in October 2010 Many more new features of interest from a Java / Websphere perspective • High performance DBATs • Limited Block Fetch support for Type 2 connections • XML enhancements • TIMESTAMP precision can now match Java (6 digits of fractional seconds) • New security/audit capabilities can allow custom code to be removed, improving performance 29 DB2Night Show © © 2011 Triton Consulting Ltd
- 30. DB2 10 for z/OS More DB2 10 features • WLM_SET_CLIENT_INFO stored procedure (also available for V9 via APAR) • Dynamic statement cache enhancement to be more tolerant of differing literal values Change JCC Driver to include the “enableliteralReplacement=‘YES’” keyword Specified in the data source or connection property • Possibility for significant MAXKEEPD increase due to DBM1 VSCR • Future DB2 10 APAR expected to deliver Plan Stability support for dynamic SQL 30 DB2Night Show © © 2011 Triton Consulting Ltd
- 31. DB2 10 – High Performance DBATs DB2 10 honours use of RELEASE(DEALLOCATE) for distributed applications • Ignored for DB2 9 and earlier versions • Can provide significant CPU savings (some beta customers saw 10-20%) • Higher EDM pool usage and potential concurrency issues with DDL and BIND Needs JCC packages to be rebound with RELEASE(DEALLOCATE) KEEPDYNAMIC(NO) • Consider using different collection for high performance DBATs, as you probably won’t be able to afford to run all connections that way • Remember, focus is now on REAL not VIRTUAL storage monitoring! 31 DB2Night Show © © 2011 Triton Consulting Ltd
- 32. Questions? 32 DB2Night Show © © 2011 Triton Consulting Ltd
- 33. Triton Consulting The Royal 25 Bank Plain Norwich NR2 4SF United Kingdom email:julian.stuhler@triton.co.uk http://www.triton.co.uk Tel: +44 (0) 870 2411550 Fax: +44 (0) 870 2411549 33 DB2Night Show © © 2011 Triton Consulting Ltd