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Oracle Tips by Mike Ault

Master-Master Replication

In a master-master replication situation both databases are independent entities which maintain a full n-way replication on all tables. This n-way replication allows both databases to be used as fully active databases and all changes to data are copied between both systems. Master-Master n-way replication is complex to manage and conflict resolution strategies must be created for all update capable tables. In addition, master-master replication may require additional bandwidth for the network that connects the platforms used. One good feature of n-way or master-master replication is that if it is properly implemented you can use different system platforms in remote locations.

Full Database Copy

In a full database copy situation a full hot backup of the active database is copied from its platform to the backup site and there it is restored as if from a disaster. A full database copy provides a backup copy of the database but it is only current to the copy date. If any activity is allowed against the database that results form the copy operation, then the databases are thrown out of sync and a new copy must be made if the databases are to truly back each other up. The time required for this full database copy operation can be prohibitive for large databases. Figure 2 shows an example of this option.

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