Functions of DBMS
o Data Processing
o A user accessible Catalog
o Transaction Support
o Concurrency Control Services
o Recovery Services
o Authorization Services
o Support for Data Communication
o Integrity Services
DBMS lies at the heart of the course; it is the most important component of a database system. To understand the functionality of DBMS it is necessary that we understand the relation of database and the DBMS and the dissection of the set of functions the DBMS performs on the data stored in the database.
Two important functions that the DBMS performs are:
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User management
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Data Management
The detailed description of the above two major activities of DBMS is given below;
o Data Processing
By Data management we mean a number of things it may include certain operations on the data such as: creation of data, Storing of the data in the database, arrangement of the data in the databases and data-stores, providing access to the data in the database, and placing of the data in the appropriate storage devices. These action performed on the data can be classified as data processing.
o A User Accessible Catalog
DBMS has another very important task known as access proviso to catalog. Catalog is an object or a place in the DBMS which stores almost all of the information of the database, including schema information, user information right of the users, and many more things about the database. Modern relational DBMS require that the Administrative users of the database should have access to the catalog of the database.
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