Fast index traversal is one of the the most important new performance features in Db2 12 for z/OS. It is an in-memory index performance optimization that enables Db2 to do fast index lookup, by avoiding expensive index B-tree traversal. To benefit from fast index traversal, data access must use a random pattern. However, SELECT, INSERT, DELETE and UPDATE statements, and in fact any operation that requires traversal of an index, can benefit from fast index traversal. 

Db2 12 can use fast index traversal for many cases starting in function level 100 and full support begins in function level 500. For the whole story, see Fast index traversal - a Db2 12 greatest hit with John Campbell.

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