Using an Index for Efficient WHERE Processing
Overview
When processing a WHERE expression, SAS determines which
of the following access methods is likely to be most efficient:
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SAS examines all observations
sequentially in their physical order.
|
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SAS uses an index to
access specific observations directly. Using an index to process a
WHERE expression is referred to as optimizing the WHERE expression.
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Using an index to process a WHERE expression improves performance in some situations but not in others. For example, it is more efficient ...
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