DBMS is software that allows users to define, create, and manage a database. It provides users with data definition languages to define the database structure, data manipulation languages to interact with data, and a data dictionary to describe the metadata. Key functions of DBMS include storing, retrieving, and updating data; granting and revoking user privileges; recovering from crashes; and enforcing data integrity rules.

1. Database Management System?
DBMS is defined as the software system/software
package that enable user to define, create,
maintain and control access to the database OR
A Collection of information.
Examples:
•Oracle
•MS Access
•MySQL

2. What the DBMS does….
• Provides users with
1. DDL: is specified by a set of definition expressed by a special
language.
2. DML: A DML is a language that enables users to access or
manipulate data.
3. Data Dictionary
– Describes the database itself (data about data-metadata)
(cont........)

3. Function of DBMS
• DBMS provides
– Data storage, retrieval and update: A DBMS provides users
with the ability to store, retrieve and update data in the
database.
– Security: is used to grant/revoke privileges to users,
– Recovery crashes: A DBMS provides a mechanism for
recovering the database in the event that the database is
damaged in any way.
– Integrity: A DBMS provides a means to ensure that both
the data in the database and changes to the data follow
certain rules.

4. Next Lecture
• Database Architecture
• Data independence