Indexing

Indexing

Indexing is a technique used in SQL Server 2008 to improve the performance of queries that search large amounts of data. Essentially, an index is a structure that allows the database engine to quickly locate the rows in a table that match a particular search condition.

In SQL Server 2008, there are two main types of indexes: clustered and nonclustered. A clustered index determines the physical order of the data in a table, while a nonclustered index is a separate structure that contains a copy of the indexed data along with a pointer to the actual data in the table.

When creating indexes, it’s important to consider the columns that are frequently searched and sorted. Indexes should be created on these columns to improve performance. However, adding too many indexes to a table can actually decrease performance, as the database engine has to spend more time maintaining the indexes. In addition to creating indexes, SQL Server 2008 also provides tools for monitoring and optimizing index usage. For example, the Database Engine Tuning Advisor can analyze a workload and recommend the most effective indexes to create or modify. Overall, indexing is an important aspect of SQL Server 2008 performance tuning and can greatly improve the speed and efficiency of database queries.

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