Database Hang and Users Cannot Login; Errors in the Alert Log 'ORA-00494: enqueue [CF]'
(Doc ID 2351185.1)
Last updated on NOVEMBER 04, 2019
Applies to:Oracle Database - Enterprise Edition - Version 184.108.40.206 and later
Oracle Database Cloud Schema 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 Cloud Exadata Service - Version N/A and later
Information in this document applies to any platform.
- Database hang and users cannot connect
- Alert log has CF enqueue error:
ORA-00494: enqueue [CF] held for too long (more than 900 seconds) by 'inst 1, osid 3106'
- AWR shows high I/O waits:
- Waits by total wait time shows top wait as user I/O:
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