Ora-00600 [kccsbck_first] Error Occuring On Alter Database Mount Exclusive Command
(Doc ID 291684.1)
Last updated on JULY 25, 2019
Applies to:Oracle Database - Enterprise Edition - Version 184.108.40.206 to 220.127.116.11 [Release 9.0.1 to 12.1]
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
Information in this document applies to any platform.
***Checked for relevance on 09-APR-2012***
***Checked for relevance on 19-Nov-2014***
Alter database mount exclusive results in:
ORA-00600: internal error code, arguments: [kccsbck_first], , , , , , , 
The description of the error is:
'We receive this error because we are attempting to be the first
thread/instance to mount the database and cannot because it appears that
at least one other thread has mounted the database already'.
However in this case the database was a standalone database on Windows.
It had only one oracle service running.
The operating system was rebooted, the oracle service was deleted and a new service created.
Even then the error persisted.
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