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database modeling

“In a single-user database, the user can modify data in the database without concern for other users modifying the same data at the same time. However, in a multi-user database, the statements within multiple simultaneous transactions can update the same data. Transactions executing at the same time need to produce meaningful and consistent results. Therefore, control of data concurrency and data consistency is vital in a multi-user database.” (Leverentz, 1999) In order to control data concurrency and consistency, transactions are usually not limited to just one database. If only one database would be used to contain the data, it would grow proportionally in size and pose limits and problems. Departments needing information off the data

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