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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414 OnDemand SQL Performance Analysis Simplified on DB2 for i5/OS in V5R4
the case of selecting only the required column. Note that in the index-only access diagram,
there is no table probe needed.
Figure 12-2 Allowing index-only access by specifying the column name rather than SELECT *
12.2.3 Avoid using the relative record number to access your data
For most tables, it is easy to define a primary or unique key. In some cases, such as for
transaction tables, it is almost impossible to determine a unique key. With native I/O, the
required records are often read using the relative record number. For native I/O, this is the
fastest access method. ...
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