ORA-16534: switchover, failover or convert operation in progress
Cause: The Data Guard broker returned this status because a switchover, failover or convert operation was in progress. The broker could not accept new requests until the operation finished.
Action: Wait until the operation is complete and reissue the request.
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ORA-16534是Oracle数据库中的一个常见错误，表示当前正在进行switchover，failover或者convert等操作任务，因此不可以再进行其它的操作，其它的操作会在这个任务完成之前被挂起。