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Facilidade de uso
Glossary
Remote Duplicate Database Facility (RDF)
Remote Duplicate Database Facility (RDF). The Compaq software product for NonStop™
Himalaya systems that assists in disaster recovery for OLTP production databases,
monitors database updates audited by the TMF subsystem on a primary system, and
applies those updates to a copy of the database on a remote system.
Remote Server Call/MP (RSC/MP). See RSC/MP.
replicated server class. A server class in a Pathway/XM environment in which server
processes are accessed directly by a TCP or a LINKMON process and which is managed
by its local PATHMON process (that is, it is not defined as an associative server).
When multiple PATHMON processes are created within the Pathway/XM environment,
such a server class is replicated under each PATHMON process. Replicated server
classes are partially comparable to the server classes defined by the NonStop™ TS/MP
product. See also direct server class, distributed server class, and associative server.
reply message. The part of an interprocess communication message that is formatted by a
server and returned to the original requester. The message contains the results of the
server’s work. See also request message.
requester. A process or program that runs in the Guardian environment on a NonStop™
Himalaya system and requests services from a server process. For example, a SCREEN
COBOL program is a requester program that is interpreted by the terminal control
process (TCP), which provides link access to Pathway server classes. Another type of
requester program makes requests through Pathsend procedure calls; such a requester
uses the LINKMON process for link access to server classes. A third type of requester
communicates with server processes directly by calling the Guardian WRITEREAD
procedure; this kind of requester does not use server classes. A requester is a specific
type of client. See also client, server, and requester/server model.
requester/server model. A model for application design that divides the tasks of data input,
data manipulation, and data output between two basic types of process: requesters and
servers. A requester sends a request to a server. The server takes the requested action
and then replies to the requester. The requester and server may reside on the same
processor or on different processors. This model is used for interprocess communication
in the Guardian environment. See also requester and server.
request message. The part of an interprocess communication message that is formatted by a
requester and sent to a specific server. The message contains any data and instructions
needed by the server to perform its processing. See also reply message.
request/response model. A model for requester/server communication in which a requester
passes a single request to a server process and receives a single response. See also
conversational model and request/response server.
request/response server. A server that provides request/response services. A service of type
request/response is handled like a procedure and has the following properties: it is
executed until completion, it does not have any dialog with the requester, and it sends
back a return value to the requester. A request/response server is analogous to a context-
free Pathway server.
Compaq NonStop™ Pathway Products Glossary — 426762-001
Glossary -26
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