Database

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database,purpose of database,database abstraction

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Database

  1. 1. Database <br />
  2. 2. 3/4/2010<br />ThepowerpointTemplates.com<br />2<br />Database is a collection of interrelated data stored together to serve multiple applications .<br />Database Management system is basically a computer based record keeping system<br />D E F I N I T I O N <br />
  3. 3. A typical file processing system suffers from some major limitations like data redundancy, data inconsistency, unsharable data ,unstandardized data, insecure data incorrect data etc .On the other hand data base over comes all these limitations .<br />3/4/2010<br />ThepowerpointTemplates.com<br />3<br />Need for Database<br />
  4. 4. 3/4/2010<br />ThepowerpointTemplates.com<br />4<br />ADVANTAGES<br /> Reduced data redundancy<br /> Controlled data inconsistency<br />Shared data<br /> Standardized data <br /> Secured data <br /> Integrated data<br />
  5. 5. 3/4/2010<br />ThepowerpointTemplates.com<br />5<br />end –user <br /> Person who is not a computer trainee but uses database to retrieve some information<br />Types <br />Of<br />Users<br />APPLICATION SYSTEM ANALYST<br />This user is concerned about all of the database<br />at the logical level<br />PHYSICAL STORAGE SYSTEM ANALYST<br />This user is concerned with the physical implementation details of the database <br />
  6. 6. ThepowerpointTemplates.com<br />6<br />DATABASE DESIGN <br />VIEW1<br />VIEW 2<br />VIEW n <br />…………...<br />External level<br />CONCEPTUAL LEVEL<br />PHYSICAL LEVEL<br />DATABASE<br />3/4/2010<br />
  7. 7. 3/4/2010<br />ThepowerpointTemplates.com<br />7<br />Sales officer<br />Purchase officer<br />View 1<br />Item-name<br />price<br />View 2<br />Item-name<br />price<br />External level<br />(individual user views )<br />Conceptual level<br />Item-number character(6)<br />Item name character(6)<br />Price numeric (5+2)<br /> Physical level<br />Stored item length =40<br />Item # type=Byte(6),offset=0,Index=lx<br />Name type=Byte(20),offset=6<br />Price type=Byte(8),offset=0<br />
  8. 8. 3/4/2010<br />ThepowerpointTemplates.com<br />8<br />THANK YOU<br />

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