Issue the following query to find out if the standby database is performing redo apply or real-time apply. If the MRP0 or MRP process exists, then the standby database is applying redo.
通过如下查询找出备库是在重做应用还是实时应用，如果MRP0或者MRP进程存在，那么备库正在应用重做。
Make sure that Redo Apply is running (so that the change is applied to the standby database). If the following query returns the MRP or MRP0 process, Redo Apply is running.
确保重做应用在运行，这样备库就会应用这些变化。如果以下的查询返回的MRP或者MRP0进程，则说明重做应用在运行。
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