- 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
11.0.0as shown in the following query:SQL> show parameter compatible NAME TYPE VALUE ------------------------------- ----------- -------------------- compatible string 11.2.0.0.0
- If you are using Active Data Guard for the first time, your standby database will definitely be in the
MOUNTstatus and MRP will be in progress; hence, cancel MRP. After cancelling MRP, make sure MRP is not running any more either through the OS levelgrepcommands or thev$managed_standbyview as shown in the following query:SQL> select db_unique_name,open_mode from v$database; DB_UNIQUE_NA OPEN_MODE ------------ -------------------- INDIA_UN MOUNTED SQL> alter database recover managed standby database cancel; Database altered. SQL> !ps -ef|grep mrp oracle 27188 5882 0 11:56 pts/1 00:00:00 /bin/bash -c ps -ef|grep mrp oracle 27190 27188 0 11:56 pts/1 00:00:00 grep mrp
- Open the database in the
Read-Onlymode to enable Active Data Guard as follows:SQL> alter database open ; Database altered. SQL> SQL> select db_unique_name,open_mode from v$database; DB_UNIQUE_NA OPEN_MODE ------------ -------------------- INDIA_UN READ ONLY Now restart Redo Apply SQL> alter database recover managed standby database using current logfile disconnect from session; Database altered.
- Verify whether redo-apply is enabled or not using the following query:
SQL> select process,status,sequence# from v$managed_standby where process like '%MRP%'; PROCESS STATUS SEQUENCE# --------- ------------ ---------- MRP0 APPLYING_LOG 522
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