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 6. Custom Database Monitor Analysis 227
6.4.12 SQE advised statistics analysis
With the introduction of SQE to OS/400 V5R2, the collection of statistics was removed from
the optimizer and is now handled by a separate component called the
Statistics Manager.
The Statistics Manager has two major functions:
Create and maintain column statistics
Answer questions that the optimizer asks when finding the best way to implement a given
query
These answers can be derived from table header information, existing indexes, or
single-column statistics. Single-column statistics provide estimates of column cardinality,
most frequent values, and value ...
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