It runs those modules of the dbms that facilitate

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Unformatted text preview: tion can be issued to the memory (also known as memory cycle time). Cylinder: In a disk pack, a set of corresponding tracks in all the surfaces is called a cylinder. All tracks of a cylinder are accessible by a single movement of the access mechanism. D Daisy wheel printer: A letter-quality printer that uses a printing head with the appearance of daisy and/or a wheel. Each petal of the daisy wheel has a character embossed on it. Data: A collection of facts in raw form that become information after proper organization or processing. Data Base Management System (DBMS): A set of programs provided to facilitate the users in organizing, creating, deleting, updating, and manipulating their data in a database. Data compression: Techniques used to reduce the volume of data in such a way that the original data can be reproduced with the desired quality level whenever required. Data Definition Language (DDL): A language used to define the structure of a database. Data dependence: Dependency of data on the application. Data dictionary: A document that maintains the data definitions of a database. It is automatically created/updated by the DDL as the database schema is defined or changed. Data element: A meaningful collection of related characters. Also called a field or data item. Data entry: The conversion of human readable data into a form a computer system can interpret. Also known as data preparation. Data Flow Diagram (DFD): A graphical representation of the various inputs, processes, and outputs of a system or program. Data integrity: Consistency of data in all files. Data Manipulation Language (DML) A language used to enter and manipulate the data in a database. Data mart: A subset of an organization's data warehouse, which contains data that is of value to a specific business unit or department rather than the whole organization. Data mining: The process of identifying interesting and useful patterns from large databases or data warehouses. It is defined as the nontrivial process of extracting implicit, previously unknown, and potentially useful information from da...
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