SQL Server Interview Questions And Answers

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 looking 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.

tabase design have to play in the performance of a SQL Server-based application:

It plays a very major part. When building a new system, or adding to an existing system, it is crucial that the design is correct. Ensuring that the correct data is captured and is placed in the appropriate tables, that the right relationships exist between the tables and that data redundancy is eliminated is an ultimate goal when considering performance. Planning a design should be an iterative process, and constantly reviewed as an application is developed. It is rare, although it should be the point that everyone tries to achieve, when the initial design and system goals are not altered, no matter how slightly. Therefore, a designer has to be on top of this and ensure that the design of the database remains efficient..

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