What is an index?

May 12th, 2005 by uCertify Leave a reply »

An index is a data structure that improves the performance of queries issued against a table. An index can be created for one or more columns of a table. Once created, an index is automatically updated and used by the database. It is logically and physically independent of data. The table or other indexes remain unaffected when an index is created or deleted.

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