ORA-16087: graceful switchover requires standby or current
control file



ORA-16087: graceful switchover requires standby or current control file..

Answer / guest

Cause: An attempt was made to perform a graceful switchover
operation using a backup or clone control file.

Action: Convert the backup control file into a current
control file prior to attempting a graceful switchover
operation. A clone control file cannot be used for a
graceful switchover operation.

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