September 2004
Beginner to intermediate
388 pages
6h 34m
English
Content preview from PROC SQL: Beyond the Basics Using SAS®
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10.8. Summary
Performance tuning involves measuring, evaluating, and modifying a query’s execution to achieve an optimal balance between competing computer resources (see section 10.2).
Avoid specifying an ORDER BY clause when creating a table or view (see section 10.3).
When sorting is necessary, specify the SORTPGM= system option to instruct the SAS System to use the best possible sort utility relative to the size of the database environment (see section 10.3.1).
Care should be exercised to assign indexes to only those discriminating variables in a table and to avoid creating too many indexes (see section 10.5).
There is no advantage in creating or using an index when a table is relatively small (usually fewer than three pages) (see section 10.6 ...
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