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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Posted in MCP, OCA DBA 10g, OCA DBA 11g, OCA DBA 9i, OCA DBA 9i PL/SQL, OCA PL/SQL Developer, OCP Application 10g, OCP Application 10g, OCP DBA 10g, OCP DBA 11g, OCP DBA 9i, OCP PL/SQL Developer, Oracle Certified Master 10g, Oracle PL/SQL Developer, Performance Tuning Expert 11g, RAC Certified Expert 10g, SQL Certified Expert 10g, SQL Certified Expert 11g

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