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Ask not what the Optimizer can do for you? ask what you can do for the Optimizer! (A11)

Topic: DB2 for z/OS

Subtopic: 2010



DATE: 2010-5-13 (01:30 PM - 02:30 PM)
SPEAKERS: Suresh Sane (DST Systems Inc)

?This query used to run in 5 seconds and now takes an hour! How could the optimizer do this to me?? Sounds familiar? But are you sure it is DB2's fault? In this session, we will examine the challenges faced by cost-based optimization and identify steps to minimize if not eliminate such behavior. We will also cover various ways of influencing and stabilizing the optimal access path. We will change the focus from ?why doesn?t IBM?? complaint to the more positive ?what can I do TODAY?? action plan.

EXP. LEVEL: Beginner,Intermediate,Advanced

OBJECTIVES:

Cost-based optimizer basics

Stats, stats and even more stats

Case study - the irresistible index?

Access path management - Influencing, stabilizing and falling back

What does the future hold?



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