Database Hang with LGWR Stuck on 'LGWR any worker group' Wait Event
Last updated on JULY 03, 2018
Applies to:Oracle Database - Enterprise Edition - Version 188.8.131.52 and later
Information in this document applies to any platform.
- LGWR slaves LG0n hung (actually spinning) blocking many sessions and instance had to be shut down to resolve hang
- Hanganalyze shows wait is 'LGWR worker group ordering':
Chain 1 Signature: 'LGWR intra group sync'<='LGWR worker group ordering' (cycle)
Chain 1 Signature Hash: 0x214b2465
Few hours before instance startup there was a Linux OS upgrade which affected the GLIBC rpm as well:
Above timestamp was close to instance startup (w/o machine reboot in-between).
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