Db2 like predicate performance. Use stage 1 predicates whenever possible...
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Db2 like predicate performance. Use stage 1 predicates whenever possible. . Read that section of the Db2 for z/OS Managing Performance Guide before proceeding. Most DB2 predicates are based on the columns of a table. For example, if two indexable predicates are combined with an OR operator, the result is indexable. For more details about predicates, query tuning, database monitoring and database performance tuning see the DB2 Performance and Tuning manual reference at the end of this article. We are facing performance issue, its taking much time. The resulting qualified or rejected rows are A single LIKE expression can therefore contain two predicate types: (1) the part before the first wild card as an access predicate; (2) the other characters as a filter predicate. The types of predicates and predicate processing are clearly documented in the Db2 for z/OS Managing Performance Guide. It is these access paths that determine how efficiently Db2 data is read and a result set delivered back.
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