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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408 OnDemand SQL Performance Analysis Simplified on DB2 for i5/OS in V5R4
12.1 Indexing strategy
The database has two types of permanent objects: tables and indexes. Tables and indexes
include information about the object’s structure, size, and attributes. In addition, tables and
indexes contain statistical information about the number of distinct values in a column and the
distribution of those values in the table. The DB2 for i5/OS optimizer uses this information to
determine how to best access the requested data for a given query request.
Since the iSeries optimizer uses cost-based optimization, the more information given about
the rows and ...
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