Limitations of file based system, Database Management System

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.

Posted Date: 3/5/2013 4:28:59 AM | Location : United States







Related Discussions:- Limitations of file based system, Assignment Help, Ask Question on Limitations of file based system, Get Answer, Expert's Help, Limitations of file based system Discussions

Write discussion on Limitations of file based system
Your posts are moderated
Related Questions
Probelm: (a) A distributed database (DDB) is a collection of multiple, logically interrelated databases which are physically distributed over a computer network" (i) Give a

Saving Derived Attributes to Avoid Re-computation   As discussed, "redundancy means duplication of exact data". But, if multiple copies of same data are present in the system,

For this application, we will consider IBM DB2 catalog data (i.e., metadata) for IBM's enterprise-class servers running the z/OS (formerly OS/390 or MVS) operating system.  One of

Problem 1. Describe the following a) Advantages of Database Systems b) Functions of a DBMS Explanation of part (a) and (b) 2. Explain the following concepts w

What is candidate key? Candidate Key - A candidate key of an entity set is a minimal superkey, which uniquely identifies each row in the relation.

Association as a cache This association must be updated when any new element is added to it, but testing for overlap using association is more efficient.    Figure:

PART MARKING: For this section, we will use part marking. This means we will supply model answers to all questions but we will only mark six questions. We will choose these randoml

With the help of an example display how records can be deleted and updated in QBE. (i) Increase Pay_Rate of employees along with the skill of ‘cook' by 10%. (ii) Delete employee

(a) Data Mining Process : In the context of this cluster analysis project , and in your own words , explain how you would execute the first stage of data mining, namely the "P

Explain different categories of failures that occur in Oracle database? Categories of Failures - In Oracle database subsequent types of failures can occurred: Statement Failu