D

For example, under ITS writing a file on the LPT spooler's directory would invoke the spooling daemon, which would then print the file. The advantage is that programs wanting files printed need neither compete for access to, nor understand any idiosyncrasies of, the LPT. They simply enter their implicit requests and let the daemon decide what to do with them. Daemons are usually spawned automatically by the system, and may either live forever or be regenerated at intervals.

Unix systems run many daemons, chiefly to handle requests for services from other hosts on a network. Most of these are now started as required by a single real daemon, inetd, rather than running continuously. Examples are cron (local timed command execution), rshd (remote command execution), rlogind and telnetd (remote login), ftpd, nfsd (file transfer), lpd (printing).

Daemon and demon are often used interchangeably, but seem to have distinct connotations (see demon). The term "daemon" was introduced to computing by CTSS people (who pronounced it /dee'mon/) and used it to refer to what ITS called a dragon.

1. A generic term for a system for storing, retrieving and managing large amounts of any type of data. Data warehouse software often includes sophisticated {compression} and {hashing} techniques for fast searches, as well as advanced filtering.
2. A {database}, often remote, containing recent snapshots of corporate data. Planners and researchers can use this database freely without worrying about slowing down day-to-day operations of the production database.
   (01 Aug 1996)

1. Terme générique pour décrire un système de stockage, de gestion et de recherche pour de très grands volumes d'information de toute nature. Les logiciels de Datawarehouse intègrent souvent des techniques sophistiquées de compression et de hachage pour des recherches rapides et des fonctions de filtrage avancées.
   Approche informatique qui vise à recenser toutes les collections de données(banques d'informations, fonds documentaires,etc.) utilisées dans une entreprise pour les fondre en un seul et unique ensemble cohérent.
2. Base de donnée, souvent distante, qiui contient un vue recente des données de l'entreprise. Les gestionnaires et les chercheurs peuvent utiliser cette base de données librement, sans peur de ralentir les opérations quotidiennes sur la base de données de production.

Distributed Computer Environment

Se dit aussi de la pratique qui consiste à alleger la configuration d'un produit pour le vendre moins cher.

• Telecommunications and postal services policy development, including liberalisation and regulation aspects, interconnection and interoperability of networks and services, universal services and communication security.
• Research and development programmes (advanced communications and telematics applications), and support for the exploitation of results.
• Supporting the establishment of a European single market in electronic information creation, retrieval and storage.

• service layer
• component interface
• management interface.

• couche service
• interface composant
• interface d'administration.

Distributed System Architecture  (réseau)

Data Exchange Interface  (SMDS)
A variable-length frame-based SMDS interface between a DTE and either a special SMDS DSU/CSU or an SMDS network node. In the former case the SMDS DSU/CSU would convert between the variable-length DXI frames and the fixed-length SMDS cells. In the latter case, this conversion would occur in the SMDS network node and only a normal DSU/CSU would be required.