Ora-00600 [kccsbck_first] Error Occuring On Alter Database Mount Exclusive Command
Last updated on MARCH 12, 2018
Applies to:Oracle Database - Enterprise Edition - Version 18.104.22.168 to 22.214.171.124 [Release 9.0.1 to 12.1]
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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