12.2: Drop Materialized View Is Very Slow or Hangs
Last updated on MAY 29, 2018
Applies to:Oracle Database - Enterprise Edition - Version 220.127.116.11 and later
Information in this document applies to any platform.
Enabling 10046 trace for the 'drop mview' command shows high waits for the following query which actually does Delete operation on this table - "SYS.MVREF$_CHANGE_STATS"
DELETE FROM SYS.MVREF$_CHANGE_STATS
REFRESH_ID = :B2 AND MV_OBJ# = :B1;
This is because, Up to 11g, there was no usage tracking for MVIEW operations. But, starting from 12.2, the usage tracking for MVIEW operations is implemented.
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