Data replication in real time

For security reasons, we have two Oracle 9.i database servers (Windows Server 2003 as O/S):
We have a database server A in our internal network, which is our Intranet, too.
We have a database server B, out of our Intranet but in our internal network, which can be accessed through Internet and any Internet user with a certain password can insert, update or delete records.
Both database servers A and B have the same structure, but their data is different. Database A can be accessed from our Intranet and its records can only be updated for our Intranet users. Database B is only available for Internet users (out of our Intranet) and they also can update its records.
**We need that both databases have the same data at any time.**
Is it possible to REPLICATE in real time both database servers? Is there any set up or configuration that we must follow to achieve that?
Thanks in advance!

If you want absolute transactional consistency, you have to have one system go down if the other goes down. You can configure multi-master replication to replicate data synchronously, but that requires that the two databases participate in the same distributed transaction, so any commit will incur the overhead of the two-phase commit protocol. If either one of the databases cannot commit the transaction, the transaction could not be committed.
Most folks go with an asynchronous replication scenario, since that allows the two databases to be very closely aligned data-wise, has a lower overhead, and does not have the same availability limitations.
I would strongly advise against it, but you could build your own replication system that attempted to repeat the transaction on the other system and, if it failed, queued the request until the other system was available. Theoretically, this would allow you to have a transactionally consistent system when both databases were up and to allow one system to continue processing if the other were down. Practically, though, I wouldn't consider this a viable approach unless the alternatives were hugely unsatisfactory, you have gobs of cash, time, and programmers to throw at the problem, and you are willing to deal with significant administrative headaches for the next few years as you go through the first few releases.
Justin
Distributed Database Consulting, Inc.
http://www.ddbcinc.com/askDDBC

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