Materialized View Refresh Takes Long Time & High Cpu Usage To Complete
(Doc ID 727215.1)
Last updated on AUGUST 14, 2020
Applies to:Oracle Database - Enterprise Edition - Version 10.2.0.3 and later
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.
There are many cases where materialized view refresh is very slow without clear reasons. This article describes one of those cases. In this case, the refresh takes a lot of CPU and few hours to complete. However, the same materialized view query takes only a few minutes to complete if run outside the refresh.
Research showed that the INSERT generated by the REFRESH takes a long time while the same INSERT executed outside of the REFRESH runs quickly.
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