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Online Memory Tuning: Tips Based on DB2 Internals (E09)

Topic: DB2 for LUW

Subtopic: 2007



DATE: 2007-5-9 (09:50 AM - 10:50 AM)
SPEAKERS: Adam Storm (IBM Toronto Lab)

When tuning database memory parameters online, care is required to avoid undesirable behaviour. This talk discusses DB2ís memory model and the internal mechanisms involved in online memory tuning. We then illustrate how reckless online tuning can cause plan changes, catalog table contention and reduced throughput. Finally we outline some techniques which will avoid unexpected and undesired behaviour when tuning online.

EXP. LEVEL: Intermediate,Advanced

OBJECTIVES:

Learn about DB2 UDB database memory model in Viper and Python

Memory parameters that can be tuned online

What happens inside DB2 when a memory parameter is updated

How online memory tuning can cause strange behavior and how to diagnose it

Techniques for safer online memory tuning



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