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Slow On Commit Refresh Of Materialized View With Non-Unique Outer Joins (Doc ID 578720.1)

Last updated on MARCH 12, 2021

Applies to:

Oracle Database - Enterprise Edition - Version to [Release 10.2]
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Information in this document applies to any platform.


-- Problem Statement:
This is an ON COMMIT Refresh Materialized View with non-unique key outer joins.
The COMMIT statements are taking long after inserting a single record into the master table.

The materialized view is ON COMMIT FAST refreshable.

The fast refresh seems slow due to the following INSERT statement (that actually inserts the records in to the mview's container table):

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