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Oracle Data Guard 11gR2 Administration Beginner's Guide by Nassyam Basha, Emre Baransel

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Time for action – enabling Active Data Guard if Redo Apply is running using SQL *PLUS

  1. If you have previously upgraded your database from Version 10gRx to 11gRx, then in order to use Active Data Guard the compatible parameter must at least be set to 11.0.0 as shown in the following query:
    SQL> show parameter compatible
    NAME                                 TYPE        VALUE
    ------------------------------- ----------- --------------------
    compatible                           string      11.2.0.0.0
  2. If you are using Active Data Guard for the first time, your standby database will definitely be in the MOUNT status and MRP will be in progress; hence, cancel MRP. After cancelling MRP, make sure MRP is not running any more either through the OS level grep commands or the v$managed_standby view as shown in the following query: ...

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