Articles & Content


Introduction to DB2 UDB for z/OS optimizer (F13)

Topic: DB2 for z/OS

Subtopic: 2005

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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