A developer must investigate volumes of data (capacity planning), what types of information will be stored, and how that data will be accessed. If you are dealing with an upgrade to an existing system, analyzing the present data and where existing data volumes occur, how that data is accessed and where the current response bottlenecks are occurring, can help you search for problem areas in the design.A new system would require a thorough investigation of what data will be captured, and look at volumes of data held in other formats also will aid design. Knowing your data is just as important as knowing the constituents of your data. Also, constantly revisit your design. As your system is built, check relationships, volumes of data, and indexes to ensure that the physical design is still at its optimum. Always be ready to check your system by using tools like the SQL Server Profiler.
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