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database,purpose of database,database abstraction

database,purpose of database,database abstraction

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Database Database Presentation Transcript

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