Client Based Database System

I'm trying to come out with a design for a client-based database system. i wanna create at least 20 databases all linked to one main server and i can make updates whenever i want either manually or thru the update table that will update automatically all the other databases.
each client can look other's information on the server and get access to it as well as clients will get the ability to communicate thru the server or sub-servers within the network.
im really confused myself how to start this and what will be the ideal shema or design to start off with.
i d really appreciate any hints guys.
thanks

If the goal is disaster recovery, you want to be looking into something like DataGuard to provide a hot standby. Basically, you take archive logs from the primary, copy them to the standby database running in a physically separate data center, and apply the logs to the standby. In the event of a failure on the primary, you simply transition over to the hot standby database. You can configure DataGuard in a variety of modes, including zero data loss (though there will be perforamance and availability implications for this sort of setting).
I don't understand the second part of your question.
how are the tables gonna be structured? This will depend entirely on your application. You don't need anything special in your data model to use DataGuard.
because this is a client based application...so it requires an updatable table or sourceI don't follow this at all.
can i get some details or a shema that shows how to put these tables togetherNor do I follow this
let's say we have one main server or source and only two other client applicationsWhat do you mean by "two other client applications"? Do you really mean applications (i.e. a collection of J2EE, .NET, PHP, etc components)? Or are you coming back to a multiple database setup with replication?
Justin
Distributed Database Consulting, Inc.
http://www.ddbcinc.com/askDDBC

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