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2.  It is a repository where organizations keep their data.  Every org maintains data about its business, its employees, and other relevant information.  For example: A school maintains record for teachers, students etc.This data needs to be available whenever its required.  It should be possible to retrieve any piece of I nformation at any time.  This data needs to be updated on regular basis.  For this we need to convert data into database. 5/12/2016 2

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5.  It arranges information in such a way that any specific piece of information can be easily accessed. 5/12/2016 5

6. Types of DB  Hierarchical  Network  Relational  Object-oriented. 5/12/2016 6

7.  Of these, the Relational DB is the most popular one.  A relational DB stores data in the form of tables.  A table organizes data in rows called Records and columns are called Fields.  Records and Fields together make up the table. 5/12/2016 7

8. Fields Reco rds 5/12/2016 8

9.  It involves creating, modifying, deleting, and adding data to a DB.  The S/W that performs these functions are called DBMS.  DBMS software: Ms Access, MySQL, Oracle. 5/12/2016 9

10. Reduces Data Redundancy. Controls data inconsistency. Facilitates sharing of data. Enforces standards. Ensures data security. Maintains Integrity. 5/12/2016 10

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