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



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

Answer / guest

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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