Limitations of file based system, Database Management System

Assignment Help:

Limitations of File Based System

The file-based system has some limitations. The limitations are listed as follows:

  • Isolation and separation of data: When the data is stored in separate files it becomes complex to access. It becomes very complex when the data has to be retrieved from more than two files as a large amount of data has to be looked for.
  • Duplication of data: Because of the decentralised approach, the file system varies to uncontrolled duplication of data. This is disagreeable as the duplication leads to wastage of a lot of storage space. It also money and cost times to enter the data more than once. For instance, the address information of student may have to be duplicated in bus list file data.
  • Inconsistent Data: The data in a file system can become inconsistent if more than one person changes the data simultaneously, for example, if any student changes the residence and the change is notified to only his/her file and not to bus list. Putting wrong data is also another reason for inconsistencies.
  • Data dependence: The physical structure and storage of data files and records are distinct in the application code. This means that it is very difficult to make changes to the existing structure. The programmer would have to recognize all the affected programs, change them and retest them. This characteristic of the File Based system is known as program data dependence.
  • Incompatible File Formats: As the structure of the files is embedded in application programs, the structure is fully dependent on application programming languages. Therefore the structure of a file generated by COBOL programming language may be quite dissimilar from a file generated by 'C' programming language. This incompatibility makes them hard to process together. The application developer may have to develop software to change the files to some common format for processing. Though, this may be time consuming and expensive.
  • Fixed Queries: File based systems are very much dependent on application programs. Any report or query needed by the organisation has to be developed by the application programmer. With type, the time, and number of queries or reports increases. Producing dissimilar types of queries or reports is not possible in File Based Systems. As a result, in some organisations the kind of queries or reports to be produced is fixed. No latest query or report of the data could be produced.

Besides the above, the maintenance of the File Based System is complex and there is no provision for security. Recovery is non-existent or inadequate.


Related Discussions:- Limitations of file based system

Using sql create a view rs for the relations r and s, Using SQL create a vi...

Using SQL create a view RS for the relations R and S. The view consists of the columns A and D renamed as X and Y in that order. Insert a tuple into it. Show the contents of t

Difference between operating system and database security, Difference betwe...

Difference between Operating System and Database Security Security within the operating system can be executed at various levels ranging from passwords for access to system, t

Entity - relation modeling and transformation, Represent the following scen...

Represent the following scenarios with E-R diagrams drawn using the ER Assistant software. The diagrams should indicate cardinality and optionality of relationships. Transform each

Deadlock and its prevention, Deadlock And Its Prevention: As seen earlier,...

Deadlock And Its Prevention: As seen earlier, though two phase locking protocol handles the trouble of serialisability, but it causes some troubles also. For instance, consider th

Security-data fragmentation, Security: Data not needed by local applicatio...

Security: Data not needed by local applications is not stored at the site, therefore no unnecessary security violations may exist. But how can we carry out fragmentation? Fragm

Explain the static or conservative two phase locking, Explain the Static or...

Explain the Static or conservative Two Phase Locking: Static (or conservative) Two Phase Locking: In this type of scheme, all the data items are locked earlier than any opera

Need database normalization and database analysis, Developer is required to...

Developer is required to do a task including: - Database Normalization - Database Analysis - ERM Diagram Details can be provided and then you can change your bid accord

Primary index, Primary index A primary index is a file that has a sorte...

Primary index A primary index is a file that has a sorted series of records having two columns: a block address for that key field in the data file; and the ordering key field.

Develop a cards website, Project Description: I want to build a card pla...

Project Description: I want to build a card playing Website. The user should be able to 1. Login. 2. Have profile access. 3. Put money into the site. 4. Selects t

Why does a dbms query language is designed, Why does a DBMS query language ...

Why does a DBMS query language is designed? A DBMS query language is designed to support end users who use English-like commands. support in the development of complex applicat

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd