In this post, you’ll learn more about the Oracle ErrorORA-19765: mount id string does not match mount id string in control file with the details on why you receive this error and the possible solution to fix it.
Oracle Error Description
ORA-19765: mount id string does not match mount id string in control file
Reason for the Error ORA-19765: mount id string does not match mount id string in control file
d by having a change tracking file that cannot be consistently updated by all instances.
How to fix the Error ORA-19765: mount id string does not match mount id string in control file ?
You can fix this error in Oracle by following the below steps
In RAC, ensure that the name specified for the change tracking file truly represents the same disk location for all nodes in the cluster. Disable then re-enable change tracking.