Time for action – using flashback on a standby database

Now we are going to see how to recover a dropped/truncated table if a standby database exists, and using the flashback feature. We won't make any changes to the primary database and even the flashback feature may be off on the primary database.

1. Enabling flashback: To perform recovery of an object, flashback must be enabled on the standby database. Ensure MRP is cancelled before enabling flashback.

   SQL> alter database recover managed standby database cancel;
   Database altered.
   SQL> alter database flashback on;
   Database altered.
   SQL> select db_unique_name,flashback_on from v$database;
   DB_UNIQUE_NAME  FLASHBACK_ON
   --------------- ------------------
   INDIA_UN        YES
   

   On the alert log, you will get the following:

   Thu Dec 20 15:22:21 2012
   RVWR started with pid=25, OS id=7900
   Thu Dec 20 15:22:24 2012
   Allocated 3981120 bytes in shared pool for flashback generation buffer
   Flashback Database Enabled at SCN 6082371
   Completed: alter database...