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  1. 1. 1 22-Jan-13
  2. 2. Edgar F. CoddEdgar Frank "Ted" Codd(August 23, 1923 – April 18,2003) was an Englishcomputer scientist who,while working for IBM,invented the relationalmodel for databasemanagement .22-Jan-13 2
  3. 3. What is a Data Base ?Collection of related files containing recordsof people,places,things,etc.Data base makes Data easy to access andmanage .A Database Management System (DBMS) is asoftware package designed to store andmanage databases. 3 22-Jan-13
  4. 4. Why do we need a Database ? A database is a place where you can store information related to a specific topic .Data security and integrity .Concurrent access, recovery . 4 22-Jan-13
  5. 5. Three level Data Abstraction View 1 View 2 ……...... View n Logical Level Physical Level 22-Jan-13 5
  6. 6. ArchitectureClient: The client are the usermachine which request for theservice to the server . It is alsocalled as front end .Server: It is a machine whichprovide service to the client . It isalso called as back end . 6 22-Jan-13
  7. 7. Two tier Architecture Application User program are Client present in client machineApplication and database are present at server and both Network are connected with interfaceDatabase like JDBC and System Server ODBC . 7 22-Jan-13
  8. 8. Three Tier Architecture User In three tier Client architectureApplication communicati Client on takes Network place from client toApplication server and Server then Server application to Database System database . 8 22-Jan-13
  9. 9. 22-Jan-13 9