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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.
An index maps the array value to a stored object. There are three ways in which the elements of an array can be indexed: 1  0 (zero-based indexing): The first element of the array is indexed by subscript of 0. 2  1 (one-based indexing): The first element of the array is indexed by subscript of 1.