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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.
Using DOMAIN Type Indexes. New in Oracle 8i is the DOMAIN index. A DOMAIN index is actually an extension to the Oracle index system that allows a developer (this is usually done by companies developing commercial applications or cartridges) to create their own index type. Index types are created using the CREATE INDEXTYPE command.