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Unformatted text preview: arranged is immaterial in direct access methods. It is the fastest of the three access methods but is relatively costly in terms of hardware and software required. The records in Indexed sequential access file are organized in sequence and an index table is used to speed up access to the records without requiring a search of the entire file. The records of the file can be stored in random sequence but the index table is in the sorted sequence on the key value. Through this a file can not only be accessed in random manner but also in sequential manner too. Since, the index table is in sorted sequence on the key value, the file management system simply access the data records in the order of the index values. Thus, index sequential files provide the user sequential access, even though the file management system is accessing the records in a physically random manner....
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This note was uploaded on 01/19/2012 for the course FINANCE 121 taught by Professor Aktiwari during the Spring '11 term at Amity University.
- Spring '11