ch1 - What is a Database? Overview of Databases and...

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1 Overview of Databases and Transaction Processing Chapter 1 2 What is a Database? Collection of data central to some enterprise Essential to operation of enterprise Contains the only record of enterprise activity An asset in its own right Historical data can guide enterprise strategy Of interest to other enterprises State of database mirrors state of enterprise Database is persistent 3 What is a Database Management System? A Database Management System (DBMS) is a program that manages a database: Supports a high-level access language (e.g. SQL). Application describes database accesses using that language. DBMS interprets statements of language to perform requested database access. 4 What is a Transaction? When an event in the real world changes the state of the enterprise, a transaction is executed to cause the corresponding change in the database state With an on-line database, the event causes the transaction to be executed in real time A transaction is an application program with special properties - discussed later - to
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ch1 - What is a Database? Overview of Databases and...

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