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Debugging/Tuning Queries via iSeries Navigator Tom McKinley Mac2@us.ibm.com

Debugging/Tuning Queries via iSeries Navigator Tom McKinley Mac2@us.ibm.com. Tour . What’s info is available System Monitoring Collection Services Work Management Table Show Indexes Index Advisor (DB, Schema or table level) BETA ONLY, removed from presentation. Stats .

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Debugging/Tuning Queries via iSeries Navigator Tom McKinley Mac2@us.ibm.com

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  1. Debugging/Tuning Queries via iSeries NavigatorTom McKinleyMac2@us.ibm.com

  2. Tour • What’s info is available • System Monitoring • Collection Services • Work Management • Table • Show Indexes • Index Advisor (DB, Schema or table level) BETA ONLY, removed from presentation. • Stats

  3. System Level Monitoring

  4. Example System Monitor

  5. Open Monitor

  6. Active Jobs

  7. Current SQL For A Job

  8. Current SQL for a job

  9. Explain from Current SQL

  10. Index Advised

  11. Columns Stats on a table

  12. Column Stats Details

  13. Statistics Requests

  14. Other sources of Info • DB2 for iSeries Web Site • http://www-03.ibm.com/servers/eserver/iseries/db2/ • Monitor queries • http://www-03.ibm.com/servers/eserver/iseries/db2/dbmonqrys.htm • White papers • http://www-03.ibm.com/servers/eserver/iseries/db2/awp.html • SQL performance and query optimization guide (Info Center) • Common, Tech Conferences… • Query Performance tuning workshop • http://www-03.ibm.com/servers/eserver/iseries/service/igs/db2performance.html

  15. Summary • Many things affect query plans • Try to understand the access methods • Learn the tools • Size matters • “Bad Performance does not scale”. • You need to collect info before you make changes to help understand what changed and the impact of that change. • Don’t only focus on Runtime. Look for resource hogs, or for queries that are run frequently • Good indexing strategy in some cases is critical

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