12.2: Drop Materialized View Is Very Slow or Hangs
(Doc ID 2401976.1)
Last updated on JANUARY 08, 2019
Applies to:Oracle Database - Enterprise Edition - Version 22.214.171.124 and later
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Express Cloud 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
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"
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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