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Dropping a user takes long time and hangs, with DBRM enabled and the user is part of a Consumer group (Doc ID 2225074.1)

Last updated on JANUARY 26, 2020

Applies to:

Oracle Database - Enterprise Edition - Version 11.2.0.0. to 11.2.0.4 [Release 11.2]
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.

Symptoms

 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.

Changes

 

Cause

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In this Document
Symptoms
Changes
Cause
Solution
References

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