Does Replication needs a DB Link?

I need to know this.. As if not then I need to explore JAVA tech to synchronize 2 DB.
NB: In my circumstances DB Link is not allowed between 2 DB instances.

From a security standpoint, though, database links (properly implemented) are likely more secure than any custom written Java based solution would be. From a pure security standpoint, an architecturally simple solution using database links would be my strong preference.
That said, depending on the number of tables that need to be synchronized, the rate of change to that data, the acceptable lag between a change being made at one site and propagated to another site, your database version(s) and edition(s), and the infrastructure you have available, you could potentially use Streams to capture and apply changes and use JMS to propagate the change records from one physical location to another. That sort of approach, though, is going to be substantially more complex than if you were to use database links with materialized views.
Justin

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