For very large databases, consider using federated database servers to balance the processing load across multiple SQL 2000 or 2005 servers. This technique horizontally partitions SQL 2000 or 2005 data over one or more SQL Servers, allowing the client application to send SQL statements to the server in the federation having most of the data required by the statement. This way, the query load is spread over multiple SQL 2000 or 2005 servers.
Federated database servers works best for databases that can be naturally partitioned over multiple servers. For example, if the data can be segregated by product line or geographical location, then the data can easily be separated over multiple databases in a federation.
Here's a federated database might work. Let's say that a company has customers in North America, South America, Europe, and Asia, and that the data stored for every customer, no matter where they are located, is identical. One option would be to partition the data based horizontally on continent. In this case, four different SQL Servers would be needed in the federation, each storing its respective data.
In almost all cases, when a query is run against the customer data stored in the federated SQL Servers, the data will all be related to a specific continent. Because of this, only one SQL Server will be hit with the query, not all of the SQL Servers. And assuming that customers in all continents will be queried, the separation of customers by continent on different SQL Servers will spread the queries among all of the servers, allowing greater performance and scalability. [2000, 2005]
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