To stop Redo Apply before shutting down the database, use the following steps:
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.
SQL> SELECT PROCESS, STATUS FROM V$MANAGED_STANDBY;
If Redo Apply is running, cancel it as shown in the following example:
SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE CANCEL;
Shut down the standby database.
SQL> SHUTDOWN IMMEDIATE;