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 25
In contrast, the amount of time that the SQE Optimizer spends optimizing an access plan is
unlimited. A check is done to determine if any indexes exist on the table, with keys built over
the columns specified in WHERE or SELECT clauses of the SQL statement. These indexes
are then re-sequenced so that the most appropriate indexes are processed first and
reorganized further based on index-only access, index probe selectivity, total index
selectivity, and the size of the index keys.
2.2.6 Data Access Primitives
The basic function of SQE Data Access Primitives is to implement the query. Using the data ...
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