Pathway/iTS TCP and Terminal Programming Guide

Designing Your Application

Compaq NonStop™ Pathway/iTS TCP and Terminal Programming Guide—426751-001

2-10

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 Compaq NonStop™ Remote Server Call/MP (RSC/MP) product

•

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 Performance

Ease of Development

Fault Tolerance

TMF Support

Support for Context Sensitivity

TCP X X X X X

TCP with IDS X X X X X X

Pathsend X X X X

RSC/MP XXXXX X

GDSX XXXX X X