Database Hang and Users Cannot Login; Errors in the Alert Log 'ORA-00494: enqueue [CF]'
Last updated on JANUARY 25, 2018
Applies to:Oracle Database - Enterprise Edition - Version 188.8.131.52 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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