Release 10.1B: Progress Fathom Replication
User Guide


Fathom Replication failure recovery terminology

With the introduction of failback processing to Fathom Replication, it is important to further clarify some existing terminology, specifically as it relates to primary and secondary databases.

Primary database

A primary database is the database that is updated from your application; the primary database is the one you initially enable as the Fathom Replication source database. During a failure recovery, the role of this database can switch from source to target and then back again to source. However, while the role of the database might change, the database itself remains the primary database.

Secondary database

A secondary database is the initial replica of the primary database; the secondary database is the one you initially enable as the Fathom Replication target database. During a failure recovery, the role of the secondary database can switch from target to source and then back again to target.

Database Restore with Implicit Transition

Using the database restore utility with the -REPLTransition parameter, you can transition a source database to a target database.

When the restore utility transitions a database, it performs a subset of the offline transition processing.The argument is as follows:

prorest db-name backupsource -REPLTransition 

The backupsource represents the device-name used when the target database was backed up.


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