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Abstract

A replication method and system for a computer system having multiple database servers for at least one database, wherein database servers are provided with a unified view of the data content. The method includes the steps of establishing connections to said multiple database servers for communicating with said database servers; distinguishing between read and update query requests; and assigning queries to respective ones of said multiple database servers to preserve the consistency of the respective unified view of data of said multiple database servers in case of receiving update queries. Assigning each new query includes the steps of distinguishing between read and update queries, determining possible assignments of that new query to one or more of said multiple database servers, each said possible update query assignment to one of said multiple database servers being based on a transaction-based replication scheme to preserve the unified view data of said multiple database servers; and assigning that new query to one of said multiple database servers as a function of said possible assignments of that new query, to preserve respective unified view of data of said multiple database servers.

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First Claim