Saturday, 3 March 2012

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

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