Data Base Management System • DBMS is a collection of interrelated data and set of programs to access those data.
Disadvantages of File Systems • Data Redundancy and Inconsistency • Data Isolation • Integrity Problems • No Transaction support • No data sharing • Security Problems
Instance • Data base changes over time as information is deleted and inserted.The collection of information stored in the database at a particular moment is called an Instance of Database. • Insert into student values(1,’misha’,99)
Schema • The overall design of the database is called as the database schema.
Database Languages SQL DDL DML CREATE INSERT DELETE DROP ALTER UPDATE SELECT TRUNCATE RENAME
Data Defination Language • Create Table • Alter Table • Truncate • Rename table • Drop table
Data Manipulation Language • Insert • Select • Update • Delete
DataBASE USER’S • Application Programmer’s
Functions of DBA • Schema Definition • Storage Structure and access method definition • Granting of Authorization for data access • Routine Maintenance. • Performance Tuning