Oracle : Ошибка ORA-12809


"cannot set %s_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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