DBWR Hangs With Event 'EXTENT MAP LOAD/UNLOCK' During Rebalance (Doc ID 1380379.1)

Last updated on NOVEMBER 25, 2011

Applies to:

Oracle Server - Enterprise Edition - Version: 11.2.0.2 and later   [Release: 11.2 and later ]
Information in this document applies to any platform.

Symptoms

If stop rebalance process, database works fine, no hangs.
If rebalance starts, database hangs in event 'EXTENT MAP LOAD/UNLOCK'.

To check run:

select sid, serial#, type, machine, program from gv$session where event ='extent map load/unlock' ;

Also in traces generated by DBWR processes are reported:

WAIT #0: nam='extent map load/unlock' ....

Cause

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