Database system

A database system is a term that is typically used to encapsulate the constructs of a data model, database Management system (DBMS) and database.

A database is an organised pool of logically-related data. Data is stored within the data structures of the database. A DBMS is a suite of computer software providing the interface between users and a database or databases. A DBMS is a shell which surrounds a database or series of databases and through which all interactions take place with the database. The interactions catered for by most existing DBMS fall into four main groups:

• Data Definition. Defining new data structures for a database, removing data structures from the database, modifying the structure of existing data.
• Data Maintenance. Inserting new data into existing data structures, updating data in existing data structures, deleting data from existing data structures.
• Data Retrieval. Querying existing data by end-users and extracting data for use by application programs.
• Data Control. Creating and monitoring users of the database, restricting access to data in the database and monitoring the performance of databases