I need to put a database on two servers, and I want them to be the same: If I change one of them, the second one...
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should take this change, for example adding columns, removing, and whatever else.
What you are asking to do is to replicate your database between two different servers. Oracle sells an addional product called Advanced Replication. With replication, you can set up one database to be the MASTER with all changes propagated to the other. You can even have two-way replication if you desire. But keep in mind that you will have to license the database and replication on both servers. This cost can add up quickly!
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