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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.
By Ashley Crossman. An index is composite measure of variables, or a way of measuring a construct using more than one data item. An index is an accumulation of scores from a variety of individual items. There are four main steps involved in creating an index: selecting possible items, examining their empirical relationships, scoring the index, and validating it.