- Master-master with Conflict Detection and Resolution (CDR): both database are treated equal. The conflict detection can be based on the record primary key(s) . You then use the built-in or custom-built functions in Oracle GoldenGate to resolve the conflicts. You might need some additional column(s) such as the data committed timestamp to resolve the conflicts.
- Master-slave with Overwrite: there is a master-slave relationship between the two databases. You always use the value on the master to overwrite the value on the slave node.
There are different strategies to implement active-active replications (or active-active replications). The following are two typical ones:
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