Termos e Definições - D

DB2 (Database 2)
IBM's relational database management system (RDBMS) offering, originally built for Multiple Virtual Storage (MVS) systems. It uses Structured Query Language (SQL) as its data manipulation and definition language. IBM has released versions of DB2 for several other operating systems, such as Windows and Unix. See RDBMS, MVS and SQL.

Um relatório que mostra o conteúdo da memória (Real e/ou Virtual) em formato hexadecimal (uma foto de um determinado instante);
DUMPS podem ser produzidos após a falha de um programa ou sistema inteiro e utilizados para diagnóstico de problemas;
A saída de um DUMP pode ser impressa ou gravada diretamente em disco e/ou cartucho;
Um DUMP será analisado por um especialista.
Chamamos de DUMP, a gravação/backup da LOG do Sistema.

Tasks responsavel por controlar RMDS* no sistema MVS - z/OS (Coletar e organizar Dados e gerar Relatórios). Nome da Task de RMDS, trabalha junto com a task DBNVTAM (que por sua vez é responsável pela comunicação e envio das OLD OUTPUTS).

DES (Data Encryption Standard)
A security specification developed by IBM in 1977. Still in use today, it is available at no charge from many online bulletin boards and is based on a single-key encryption algorithm. If user A wants to send an encrypted file to user B, user A would first encrypt it with a secret key. User B would then decrypt the file using the same key. Recipients must prearrange for possession of the appropriate key for decryption to take place.

DFSMS (Data Facility Storage Management Subsystem)
The conceptual repackaging of IBM's Data Facility family of products and Resource Access Control Facility (RACF). It is intended to simplify the management and use of external storage resources by providing a device-independent means of requesting services by data set. See RACF.

DFSMSdfp (DFSMS Data Facility Product)
One of four components of IBM's Data Facility Storage Management Subsystem (DFSMS). DFSMSdfp provides data access and catalog management functions. See DFSMS.

DFSMSdss (DFSMS Data Set Services)
An IBM software product that provides copy, dump-restore and storage space management functions. It is one of the four modules of IBM's Data Facility Storage Management Subsystem (DFSMS). See DFSMS.

DFSMShsm (DFSMS Hierarchical Storage Manager)
The module of IBM's Data Facility Storage Management Subsystem (DFSMS) that provides automatic space and availability management within a storage hierarchy. See DFSMS.

DFSMSrmm (DFSMS Removable Media Manager)
The tape management module in IBM's Data Facility Storage Management Subsystem (DFSMS). DFSMSrmm is used to track the location of all tapes, including those at remote sites or in transit. See DFSMS.

DIF (Directory Interoperability Forum)
Coalition formed in 1999 by IBM, Novell, Oracle, Lotus Development and Isocor to promote the use of Lightweight Directory Access Protocol (LDAP) by developers, and to accelerate directory interoperability standards. See LDAP.

Distribution Queue
This is where Data is kept then sent through Subsystem Qsnads. (Sna subsystem sna is a form of network communication).
AS400 plataform.

DL/I (Data Language I)
The language in which application programmers specify requirements to IBM's Information Management System Database Manager (IMS DB). See IMS and IMS DB.

DLSw (Data Link Switching)
An IBM-developed technique for carrying Systems Network Architecture (SNA) traffic over a Transmission Control Protocol/Internet Protocol (TCP/IP) network. DLSw "tunnels" or encapsulates SNA traffic using the transport services of TCP/IP. See SNA and TCP/IP.

DRDA (Distributed Relational Data Architecture)
An architecture for enterprisewide data access, introduced by IBM in 1990. It was designed to homogenize data definition and access across IBM's different hardware and software platforms.

DSA (Dynamic Scalable Architecture)
A database server architecture offered as part of IBM's Informix Dynamic Server product line, designed to help enterprises manage increasingly large and complex databases while improving overall system performance and scalability.

A multiprocessor design term that IBM introduced with the 3081 Processor Complex. In the dyadic design, two processors share storage and operated under a single control program.


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