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Oracle® Solaris Cluster Geographic Edition Data Replication Guide for Oracle Data Guard

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Updated: June 2017
 
 

Recovering Oracle Data Guard Data After a Takeover

After a successful takeover operation, the standby cluster, cluster-newyork, becomes the primary for the protection group, and the services are online on the standby cluster. After the recovery of the original primary cluster, the services can be brought online again on the original primary cluster by using a process called failback.

Geographic Edition software supports the following two kinds of failback:

  • Failback switchover. During a failback switchover, applications are brought online again on the original primary cluster, cluster-paris, after the primary cluster data has been resynchronized with the data on the standby cluster cluster-newyork.

    For a reminder of which clusters are cluster-paris and cluster-newyork, see Example Geographic Edition Cluster Configuration in Oracle Solaris Cluster 4.3 Geographic Edition System Administration Guide.

  • Failback takeover. During a failback takeover, applications are brought online again on the original primary cluster and use the current data on the primary cluster. Any updates that occurred on the standby cluster are discarded.

If you want to leave the new primary, cluster-newyork, as the primary cluster and the original primary cluster, cluster-paris, as the standby cluster after the original primary cluster starts again, you can resynchronize and revalidate the protection group configuration. You can resynchronize and revalidate the protection group without performing a switchover or takeover.