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Oracle query_rewrite_integrity and query_rewrite_enabled

Oracle Database Tips by Donald Burleson


Oracle says you must have the following initialization parameters defined to create a function-based index:


But TRUSTED doesn't seems a good value, is there some problem if I use enforced:


Which is the best option for using query_rewrite_integrity and query_rewrite_enabled?


First, it's important to note that query_rewrite_integrity and query_rewrite_enabled are required to use materialized views and function-based indexes.

There are three acceptable values for query_rewrite_integrity:

  • enforced (default) - Presents materialized view with fresh data

  • trusted - Assumes that the materialized view is current

  • stale_tolerated - Presents materialized view with both stale and fresh data

The problem here is about the "freshness" of the data.  One of the great benefits if Materialized Views is that you don't have to choose to constantly keep them synchronized with their base tables.  On many systems (especially Business Intelligence), having the last days data is not relevant, and the materialized view can be refreshed nightly via a schedule dbms_scheduler job.  In this case query_rewrite_integrity=stale_tolerated is wonderful.


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Note: This Oracle documentation was created as a support and Oracle training reference for use by our DBA performance tuning consulting professionals.  Feel free to ask questions on our Oracle forum.

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