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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.
A clustered index is the table. When you define a clustered index on a table, the database engine sorts all the rows in the table, in ascending or descending order, based on the columns identified in the index definition (the key columns).