Rule Definition
You incur an extra CPU cost for passing the columns from DB2 to your application. But this is not the
only consideration, retrieving additional columns can cause an additional access to the data
pages instead of an index-only access, resulting in additional I/Os, accumulating higher CPU,
and elapsed time.
Remediation
Limit the columns in your SQL select statements to those applications really needing it.
Related Technologies
Technical Criterion
Efficiency - SQL and Data Handling Performance
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