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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© Copyright IBM Corp. 2007. All rights reserved. 379
Chapter 11. Environmental settings that
affect SQL performance
SQL queries optimized by DB2 for i5/OS generate access plans to retrieve the data. These
access plans are impacted by the environment in which the query is generated. Various
environmental factors affect the costing of access plans and therefore which access plan is
selected to retrieve the data.
This chapter discusses some environmental attributes that may affect the access plan as
following:
Optimization goal
Sensitive cursors
SMP (Symmetrical multiprocessing) Parallel Degree
11
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.