Database Management System (DBMS) It is software that defines a database, stores the data, supports a query language, produces reports, and creates data entry screens. o Database also needed to build computerized business applications, to create business applications that operate in multiple locations, to conduct business on the internet and also to enable customers to place orders using the web. All should be able to work with the same set of data. o We need a database, to share data of all kinds between users (except for very small systems), between tools working on them, and usually between different computers.

o Several users and/or several tools must be able to safely access the same data concurrently by using the database.

We need persistent storage and storage must be reliable. Database Applications o Banking: all transactions o Airlines: reservations, schedules o Universities: registration, grades o Sales: Customers, products, purchases o Manufacturing: production, inventory, orders Why do we need a Database? o Database has an availability of a storage system, the most obvious of these being persistence. A database also represents some aspects of the real world, sometimes called the mini-world or the Universe of Discourse (UOD). Data is a collection of raw information and information is a collection of processed data.

Introduction to Database A database is a collection of inter related data items that can be processed by one or more application systems.

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