Materialized View Fast Refresh Is Slow Due to a Poor Execution Plan During the Insert Phase With Hints Such As CARDINALITY, NO_SEMI_JOIN, and HASH_SJ
(Doc ID 420040.1)
Last updated on FEBRUARY 17, 2019
Applies to:Oracle Database - Enterprise Edition - Version 188.8.131.52 and later
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Backup Service - Version N/A and later
Information in this document applies to any platform.
Fast refresh for a materialized view is very slow. Tracing the recursive SQL with SQL Trace or the 10046 event shows that the insert phase of the refresh is using one of the following hints in a subquery:
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