Articles & Content
Topic: 2005 EU
Subtopic: DB2 for z/OS
DATE: 2005-10-25 (09:45 - 10:45)
SPEAKERS: Terry Purcell (IBM Silicon Valley Lab)
Ever wondered why the DB2 optimizer chooses a certain access path? Before DB2 UDB V8, you had to be an optimizer expert to answer that question. This presentation will outline a method to utilize the extensive access path detail available with V8 Visual Explain and compare with the actual reality for a given query. The end result is that you will be able tune SQL like an expert.
EXP. LEVEL: Beginner,Intermediate,Advanced
Comparing Estimates with Reality
What do I do if the estimate is incorrect?
Automating the process
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