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 11. Environmental settings that affect SQL performance 397
table scan, that particular operation can use parallelism and benefit from SMP. Figure 11-10
shows how an SQL SELECT statement can take advantage of SMP.
Figure 11-10 SQL Requests and SMP
Some operations, such as ordering the data via a sort, are not performed in parallel and do
not benefit from SMP.
If a temporary index is created during the query request, the operation can benefit from SMP.
As queries are analyzed and tuned for performance, it is important to remember which
methods and strategies are parallel-enabled and potentially benefit from SMP.
11.4.4 Parallel Database ...
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