This operator represents how data is filtered.
Operator name: FILTER
Represents: The
application of residual predicates so that data is filtered based
on the criteria supplied by the predicates.
Performance
suggestions: - Ensure that you have used predicates that retrieve only the data
you need. For example, ensure that the selectivity value for the predicates
represents the portion of the table that you want returned.
- Ensure that the optimization class is at least 3 so that the optimizer
uses a join instead of a subquery. If this is not possible, try rewriting
the SQL query by hand to eliminate the subquery.
DB2 10.5 for Linux, UNIX, and Windows