What are the components of Database Management System(DMBS)？

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Data Dictionary

- Contains a list of all files in the database, the number of records in each file, and the names and types of each field.

- Most DMBS keep the data dictionary hidden from the users to prevent them from accidentally destroying its contents.

- Do not contain any actual data from the database, only book keeping information for managing it.

Data Manipulation Language

- One of the database languages.

- Used to access and update the existing data in database.

- Used to form a database scheme that is to create, update or delete a database schema

- Provides operations to be used in manipulating data in the database.

- Two types of DML：

Procedural Language	Non-procedural Language
- A language where users need to identify what data is needed and how the data can be accessed - e.g. COBOL, Pascal, C etc.	- A language where users only need to know what data needed to be updated. - Non-procedural uses fourth generation language like SQL (Structured Query Language).

Data Definition Language

- One of the database languages

- A language that enables database Administrators or users to define and create entities and relationships that are needed in the database.

- Used to define a database schema or to make changes to the existing one, but cannot be used to manipulate data

- Allows database manager or users to explain and name entities needed for the application, and the relation among the entities.

For Malay Version,
Apakah Komponen Sistem Pengurusan Pangkalan Data(DBMS)?

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