Articles & Content
Topic: 2006 EU
Subtopic: DB2 for z/OS
DATE: 2006-10-5 (10:30 - 11:30)
SPEAKERS: Terry Purcell (IBM Silicon Valley Lab)
Ever wondered why the DB2 optimizer chooses a certain access path? The wrong index, poor table join sequence? In the DW world, this can cause a query to run for hours. 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.
EXP. LEVEL: Beginner,Intermediate,Advanced
Comparing estimates with reality
What to do if the estimate is incorrect?
Automating the process
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