Question

Difference between sequential and indexed file organisation in form of table

Answer 1

Answer:

Sequential Files: Data is stored on tape/disk.

Indexed Files: Data is stored on disk only.

Explanation:

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Answer 2

• In Sequential file organization, the records are read and written in sequential order. In Indexed file organization, the records are written in sequential order but can be read in sequential as well as random order.
• The Sequential file organization stores the data in sequence order.  We can access the data sequentially and the data can be stored only at the end of the file. There are 2 types of sequential files- A line sequential file, Record sequential file.
• Indexed file organization stores the record sequentially depending on the value of the RECORD-KEY(generally in ascending order). A RECORD-KEY in an Indexed file is a variable that must be part of the record/data. In the case of Indexed files two types of files are created:
• Data file: It consists of the records in sequential order.
• Index file: It consists of the RECORD-KEY and the address of the RECORD-KEY in the data file.
• The Indexed file can be accessed sequentially same as Sequential file organization as well as randomly only if the RECORD-KEY is known.

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