The first step in getting ready to fail back processing to the primary computer is to begin replication from the secondary database to the primary database on the primary machine. This process is knows as secondary replication.
As shown in the following figure, setting up secondary replication begins with a backup of the secondary database. Using an online backup limits the amount of downtime required.
Figure 20. Performing an online backup of secondary database
The backup files must be either sent to the primary computer or stored on a shared device that both the primary and secondary machines can access.
Once the backup files are available on the primary machine, you can restore the new primary database using the files, as shown in the following figure.
Figure 21. Restoring backup of secondary database
Before you restore the database, ensure that you have set up a structure file that the PROREST utility can use. For details about creating a structure file, see Step2: Create a structure file.
You must now transition the primary database from a source to a target, as shown in the following figure.
Figure 22. Transitioning source database to target
You can use either of the following methods to transition the primary database:
To transition the database as it is restored, use the following command:
Regardless of which method you choose, the primary database will become a target database ready to be the replica of the production database on the secondary machine.
At this point, the secondary database is a source database and the primary database is a target database, as shown in the following figure.
To transition the database as it is restored, use the following command:
