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About Indexes. Indexes are optional structures associated with tables and clusters that allow SQL statements to execute more quickly against a table. Just as the index in this manual helps you locate information faster than if there were no index, an Oracle Database index provides a faster access path to table data.
Included columns can benefit your application because non-clustered indexes that have included columns can cover more queries. An index is called a covering index if it contains each column referenced by the search condition of a query. Included Columns-starting with SQL Server 2005, you can add fields to indexes with a smaller performance hit. 2  Indexed Views-how to build indexes on top of views for more speed. 3  XML Indexes Overview-how to index XML documents and fragments. 4  XML Index Rules-some additional considerations and requirements for XML indexes.