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Unformatted text preview: e query language that collects the
facts about a query from the user and composes query language statements
Query language: A language that enables users to define their requirements for
extracting the desired information from the database in the form of queries. R
Radio-router technology: An emerging wireless technology designed to make
links in an IP network mobile.
Radix: See base.
RAM disk: A block of semiconductor RAM chips (other than the RAM chips used
for the main memory) used in some computers as a simulated disk to make
applications execute faster. Also known as silicon disk or pseudo disk. Note that
RAM disk is not really a disk at all.
Random Access Memory (RAM): A memory in which the time to retrieve stored
information is independent of the address where it is stored.
Random file See direct file.
Random/direct-access storage device: A storage device in which access to any
stored information is direct, and approximately equal access time is required for
accessing any information irrespective of its location. Magnetic, optical and
magneto-optical disks are typical examples of such a storage device.
(RAD): A methodology for developing
applications software for computers. The methodology ensures quicker
development and greater user involvement than traditional methods.
Raster graphics: Graphic objects composed of patterns of dots called pixels.
Read-Only Memory (ROM): A non-volatile memory chip in which data are stored
permanently and cannot be altered by the programmer.
Real-time operating system: An operating system that is designed to handle the
processing requirements of real-time systems.
Real-time system: A system that must satisfy the requirement of producing the
desired results before a certain deadline.
Record: A collection of related items of data treated as a unit.
Record length: A measure of the size of a record, usually specified in units such as
(RISC) architecture: An
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This document was uploaded on 04/07/2014.
- Spring '14