Index file

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An index file is created when an Index command is executed or (less frequently) when an OPEN internal statement creates a new master file. Also called a key file, the index file helps a program quickly access the information in a master file.

An index file contains a key field and an address (or relative record number) for each record in the master file, similar to the way in which a telephone directory contains the name and address of each resident in a city.