Dropping a user takes long time and hangs, with DBRM enabled and the user is part of a Consumer group
Last updated on JANUARY 22, 2017
Applies to:Oracle Database - Enterprise Edition - Version 18.104.22.168. to 22.214.171.124 [Release 11.2]
Information in this document applies to any platform.
After Oracle Database Resource Manager (DBRM) configuration, dropping users are taking extremely long time to complete.
User being dropped was holding a 'X' mode 'Library Cache Lock' on the resource consumer group object, which was blocking all other users who want
'S' mode lock on this object. Several 100 sessions were queued up resulting in a hang like situation on a critical production database.
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