Oracle Data Guard 11gR2 Administration Beginner's Guide

Time for action – testing real-time apply

If real-time apply is enabled, the apply services can apply redo data without waiting for the current standby redo logfile to be archived. This allows faster role transitions because you avoid waiting for a redo log to be transported to the standby database and then applied. In this example, we'll see how changes are transferred and applied to the standby database. The redo log that includes changes is not archived on primary.

1. In order to use real-time apply, the redo transport service from primary to standby must use LGWR. Run the following query on the primary database and check the log archive destination configuration.

   SQL> show parameter log_archive_dest_2
   NAME                TYPE       VALUE
   ------------------- -------- ...