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Read or Download Digital Press - Microsoft Sql Server 2005 Performance Optimization And Tuning Handbook Apr 2007 PDF

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Additional info for Digital Press - Microsoft Sql Server 2005 Performance Optimization And Tuning Handbook Apr 2007

Example text

Pseudocode will not function 100% in any particular environment, database, programming language, or on any specific hardware platform. The intention of presenting a concept using pseudocode is to demonstrate—not to provide bulletproof example coding. Temporary tables: These can be used to form intermediary functions per session and are manually or automatically emptied and dropped after each use. A session is a connection to a database, between a user and a database. 3 Denormalization for performance Temporary tables can sometimes help to eliminate intermediary functionality and eliminate duplication.

2. Composite field keys use up a lot of physical space, somewhat negating the space saving I/O advantage of creating an index in the first place. Also, a composite index will create a more complicated index. A more complicated index makes the job of specialized index searching algorithms a more difficult task. The sheer scale and size of OLTP Internet databases can sometimes be horrifying to even the most seasoned of database administrators. Many hundreds of gigabytes are common. Some modern OLTP databases are even on the terabyte scale.

1 Multiple table joins (more than two tables) A join is a query that merges records from two tables based on matching fields. When more than two tables are in a single join, it gets more difficult for a relational database to find all the records efficiently. If these types of joins are executed frequently, the result is usually a general decrease in performance. Queries can sometimes be speeded up by denormalizing multiple tables into fewer tables. The objective would be to reduce the number of tables in join queries overall.

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