Database Hang with LGWR Stuck on 'LGWR any worker group' Wait Event
(Doc ID 2377339.1)
Last updated on MARCH 12, 2021
Applies to:Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Backup Service - Version N/A 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).
To view full details, sign in with your My Oracle Support account.
Don't have a My Oracle Support account? Click to get started!
In this Document