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ODA Support - 12.2 RAC Database High "gc cr/current request" 'gc buffer busy acquire' and Locks On Hot Object SELECT SPARE6 FROM USER$ WHERE USER#=:1 After Upgrading from Single Instance (Doc ID 2583711.1)

Last updated on JANUARY 06, 2022

Applies to:

Oracle Database Appliance Software - Version to Bare Metal [Release 12.2]
Information in this document applies to any platform.


Upgrade to 12.2 and now sessions are hanging and locking requiring manual killing of sessions.
Requires a RAC configuration as Single-Instance does not show the severity of the problem all other things being equal.
The queries and application had worked before an upgrade and / or migration to 12.2.

Wait events include:


 Upgrade of the Oracle Product using Linux to UEK4 with kernels older than 4.1.12-61.49.1.
  This includes Engineered Systems running UEK4 which are the default in many 12.2 versions of the product line.


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