Articles & Content


SQL Performance under the Microscope - Part 1 of 2 (J08)

Topic: 2005 NA

Subtopic: DB2 for z/OS

DATE: 2005-05-24 (02:00 PM - 03:10 PM)
SPEAKERS: Maria Sarikos (Computer Associates)

Fact #1: SQL can make DB2 fly or crawl. Fact #2: Large performance gains are achieved by tuning SQL. In part 1, we look at how you can make SQL fly. We take an in-depth look at predicate processing, how joins can be made more efficient and also how stage 1 can improve and stage 2 predicates can impact performance. Lastly we discuss DB2 EXPLAIN and how to find SQL problems that cannot be spotted in the PLAN_TABLE.

EXP. LEVEL: Beginner,Intermediate


Understanding the anatomy of an SQL statement

Predicate processing

Join Processing

Stage 1 vs Stage 2 - Important things you need to know

Explaining EXPLAIN

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