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3.5. File Organisation

A file organisation in a database system essentially is a technique of physical arrangement of records of a file on secondary storage device. It is a method of arranging data on secondary storage devices and addressing them such that it facilitates storage and read/write (input/output) operations of data or information requested by the user. The organisation of data in a file is influenced by number of factors that must be taken into consideration while choosing a particular technique. Some of these factors are as follows:

  • Fast response time required to access a record (data retrieval), transfer the data to the main memory, write record and or modify a record.

  • High throughput.

  • Intended use (type of application).

  • Efficient utilisation of secondary storage space.

  • Efficient file manipulation operations.

  • Protection from failure or data loss (disk crashes, power failures and so on).

  • Security from unauthorised use.

  • Provision for growth.

  • Cost.


  

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