TS/MP Pathsend and Server Programming Manual (G06.24+, H06.03+)

Designing Your Application
NonStop TS/MP Pathsend and Server Programming Manual–132500
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Remote Duplicate Database Facility (RDF)
Remote Duplicate Database Facility (RDF)
If disaster recovery of your database is important, the Remote Duplicate Database
Facility (RDF) is available to maintain a copy of the database on a remote system. The
RDF product monitors database updates audited by the TMF subsystem and applies
those updates to the remote copy of the database. For more information about the RDF
product, refer to the Remote Duplicate Database Facility (RDF) System Management
Manual.
Designing Requester Programs
To facilitate the accessing of Pathway server classes from different transaction sources,
you can develop requester programs for a Pathway application that use any of the
following access approaches:
•
SCREEN COBOL and the TCP
•
SCREEN COBOL and the TCP with the intelligent device support (IDS) facility
•
The Pathsend procedure calls
•
The Remote Server Call (RSC) product, with or without the Pathway Open
Environment Toolkit (POET)
•
The Extended General Device Support (GDSX) product
In Table 2-1
, key technical and business considerations are mapped to each way of
accessing Pathway servers. More information about each approach is provided following
the table.
Table 2-1. Considerations for Requester Programs
Server
Access
Approach
Large
Number
of I/O
Devices
Support
for
Intelligent
Devices
Multi-
Threading
Capability
High
Perform-
ance
Ease of
Develop-
ment
Fault
Toler-
ance
TMF
Support
Support
for
Context
Sensi-
tivity
TCP X X X X X
TCP with
IDS
XX X X XX
Pathsend X X X X
RSC or
POET
XX X X X X
GDSX X X X X X X