Oracle DBA, How To, Error, Cause and Action

ORA-12809: cannot set string_INSTANCES when mounted in exclusive mode

ORA-12809: cannot set string_INSTANCES when mounted in exclusive mode


Cause:


An attempt was made to set SCAN_INSTANCES or CACHE_INSTANCES using the ALTER SYSTEM command while the database was mounted in exclusive mode.



Action:


SCAN_INSTANCES / CACHE_INSTANCES may not be set unless running Oracle Real Application Clusters mounted in CLUSTER_DATABASE mode.

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