ORA-16897：start database to mount mode
错误码
错误描述：start database to mount mode
错误原因：This error was returned by DBMS_DRS.SWITCHOVER because the database must be started to the mount mode to complete the switchover operation. Or, the error was returned from DBMS_DRS.REINSTATE or DBMS_DRS.CONVERT_TO_PHYSICAL when the database must be started to the mount mode to perform the operation.
解决方法：Start the database to the mount mode, wait for the database to start, and wait for the broker to complete initialization using DBMS_DRS.WAIT(WAIT_BOOT, wait time in seconds). Then, for reinstate and convert operations, retry the operation.
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