Articles & Content
Topic: 2005 NA
Subtopic: DB2 for z/OS
DATE: 2005-5-25 (02:00 PM - 03:10 PM)
SPEAKERS: Patrick Bossman (IBM Silicon Valley Lab)
This is an introduction to how DB2 UDB for z/OS optimizes a query. Starting with query transformation, access path selection and costing, then parallelism. Within each category describe what the optimizer does, and what users can do to give the optimizer the best chance at selecting an efficient access path.
EXP. LEVEL: Beginner
Inputs which influence the optimizer
Query transformations performed
Access path selection and costing
Reduce prepare costs for complex queries
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