ORA-16465：operation must be initiated on an open primary database
错误码
错误描述：operation must be initiated on an open primary database
错误原因：An attempt was made to issue the ALTER DATABASE SWITCHOVER TO <target_db_name> [VERIFY] or ALTER DATABASE COMMIT TO SWITCHOVER TO STANDBY command on a database other than an open primary database.
解决方法：Issue the command on an open primary database.
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