enq: MS - Contention During Materialized View Refresh
(Doc ID 2366181.1)
Last updated on JULY 22, 2021
Applies to:Oracle Database - Enterprise Edition - Version 220.127.116.11 and later
Oracle Database Cloud Schema Service - Version N/A and later
Gen 1 Exadata Cloud at Customer (Oracle Exadata Database Cloud Machine) - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Cloud Exadata Service - Version N/A and later
Information in this document applies to any platform.
enq:MS - contention is seen during MV refresh, even though there is no MV log. The MV is doing complete refresh.
During refresh, application sessions experience enq: MS - contention when accessing the base objects of the materialized views, and this sometimes lasts long enough that it times out the session (from the application side).
When an mview refresh operation takes place, one of the things that happen is: SYS.SNAP$ and SYS.MLOG$ are updated to show the time of refresh.
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