Database Systems and Structures
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Sample Chapter From Database Systems and Structures
Copyright © Osmar R. Zaļane
1.0 Database Management Systems
1. A database management system (DBMS), or simply a database system (DBS), consists of
- A collection of interrelated and persistent data (usually referred to as the database (DB)).
- A set of application programs used to access, update and manage that data (which form the data management system (MS)).
2. The goal of a DBMS is to provide an environment that is both convenient and efficient to use in
- Retrieving information from the database.
- Soring information into the database.
3. Databases are usually designed to manage large bodies of information. This involves
Definition of structures for information storage (data modeling).
Provision of mechanisms for the manipulation of information (file and systems structure, query processing).
Providing for the safety of information in the database (crash recovery and security).
Concurrency control if the system is shared by users.
1.1 Purpose of Database Systems
1. To see why database management systems are necessary, let\'s look at a typical file-processing system\'
supported by a conventional operating system.