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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276 OnDemand SQL Performance Analysis Simplified on DB2 for i5/OS in V5R4
8.1 What is Visual Explain
Visual Explain provides a graphical representation of the optimizer implementation of a query
request. The query request is broken down into individual components with icons that
represent each unique component. Visual Explain also includes information about the
database objects that are considered and chosen by the query optimizer. Visual Explain’s
detailed representation of the query implementation makes it easier to understand where the
greatest cost is being incurred.
Visual Explain shows the job run environment details and the levels of database parallelism
that were used to process the query. It also shows the access plan in diagram f
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