SQL Server in a good program to achieve optimum performance, the key is to have a good database design. In practice, many SQL Server database design programs are often poorly led to the poor performance. Therefore, to achieve a good database design must consider these issues. In general, the logical database design will meet the first three standardized criteria: 2. No. 2 specification: Each non-key field must depend on the primary key, can not rely on a combination of certain components of the primary key . 3. 3 Specifications: a non-key field can not rely on the other a non-key field. Designed to comply with these rules will have fewer columns and more tables and, therefore, reduce data redundancy, but also reduces the pages used to store data. But the table relationships may need to deal with complex merger, it will reduce system performance. Some degree of non-standardization can improve system performance, non-standardized process can be considered under the performance of different methods in several different, but the following method has been applied in practice, can often improve performance.
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