CS8492 DATABASE MANAGEMENT SYSTEMS

PURPOSE OF DATABASE SYSTEMS

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P.Poovizhi

AP/IT

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Purpose of Database Systems

• Data redundancy and inconsistency

– Information Duplication(redundancy)

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• Difficulty in accessing data.

– conventional file-processing environments do not allow needed data to be retrieved in a convenient and efficient manner.

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Purpose of Database Systems

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• Data isolation

– scattered in various files

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Purpose of Database Systems

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• Integrity problems

– difficult to change the programs (adding new constrains)

– Below zero balance ex(in bank)

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Purpose of Database Systems

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• Atomicity problems

– inconsistent database state.(Money transfer)

– Atomic means the transaction must happen in its entirety or not at all. It is difficult to ensure atomicity in a conventional file processing system.

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Purpose of Database Systems

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Find the Difference

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Concurrent access anomalies • Many systems allow multiple users to update the data simultaneously -

interaction of concurrent updates is possible and may result in inconsistent

data.

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Security problems

Enforcing security constraints to the file processing system is difficult

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Use of DBMS

• Effective and efficient management of data

• Query processing and management

• Easy to understand and user friendly

• Security and integrity of data

• Better Decision making

• Data sharing and storage

• Better access to accurate data

• Ensures error free information

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Assessment - Puzzle

• Is there any relationship between this picture with purpose of database system?

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Solution

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Redundancy

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Assessment - Puzzle

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• Is there any relationship between this picture with purpose of database system?

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Solution

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Reference Link

• https://www.geeksforgeeks.org/need-for-dbms/

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Thank you

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