March 2007
Intermediate to advanced
488 pages
13h 46m
English
book
OnDemand SQL Performance Analysis Simplified on DB2 for i5/OS in V5R4
by Hernando Bedoya, Jaime Gaug, James Kerl, Ser Ser NG, Jose Cardoso dos Santos
Content preview from OnDemand SQL Performance Analysis Simplified on DB2 for i5/OS in V5R4
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Chapter 2. DB2 for i5/OS performance basics 29
Multiple access plans can be maintained for a single SQL statement. Although the SQL
statement itself is the primary hash key to the SQE Plan Cache, different environmental
settings can cause different access plans to be stored in the SQE Plan Cache. Examples of
these environmental settings include:
Different SMP Degree settings for the same query
Different library lists specified for the query tables
Different settings for the job’s share of available memory in the current pool
Different ALWCPYDTA settings
Currently, the SQE Plan Cache can maintain a maximum of three different access plans ...
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