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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138 OnDemand SQL Performance Analysis Simplified on DB2 for i5/OS in V5R4
Figure 5-29 Access plan rebuild reasons
From this report, the most important information is in the Access Plan Rebuild Reason
column. Some of the possible reasons are:
Different File Or Member(change in library list or default schema)
More Than Ten Percent Change In Number Of Rows
New Access Path Found(Index created)
Access Path No Longer Found Or Valid(Index deleted)
Different CCSID
Different Date Or Time Format
Different Sort Sequence Table
Different Storage Pool or Paging Option(Optimizer’s fair share of memory pool change)
Symmetric Multi Processing Change ...
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