Bug 28697526 - Session Hangs On 'gc cr request' And Other Sessions Wait On 'cr request retry' (Doc ID 28697526.8)

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Bug 28697526  Session Hangs On 'gc cr request' And Other Sessions Wait On 'cr request retry'

 This note gives a brief overview of bug 28697526. 
 The content was last updated on: 20-OCT-2020
 Click here for details of each of the sections below.


Product (Component) Oracle Server (Rdbms)
Range of versions believed to be affected Versions BELOW 20.1
Versions confirmed as being affected
Platforms affected Generic (all / most platforms affected)


The fix for 28697526 is first included in

Interim patches may be available for earlier versions - click here to check.


Related To:


A session hung waiting for wait event 'gc cr request', and it blocked
other sessions at wait event 'cr request retry'.
Rediscovery Notes
If a session hangs on 'gc cr request' but there are no blockers then you may have encountered this problem. 
- Long gc cr request wait
- GCS CLIENT: grant 0 cvt 1 mode 0x0 role 0x24...
- GCS CLIENT: KJBL history 0x1
- GCS SHADOW: grant 0 cvt 1 mode 0x0 role 0x2#...lst 0xc0 

Set the parameter _gc_cr_server_read_wait=false.  Example:
alter system set "_gc_cr_server_read_wait"=false scope=both sid='*' ;


Please note: The above is a summary description only. Actual symptoms can vary. Matching to any symptoms here does not confirm that you are encountering this problem. For questions about this bug please consult Oracle Support.



Bug:28697526 (This link will only work for PUBLISHED bugs)
Note:245840.1 Information on the sections in this article