Compaq Reliable Transaction Router manual Components in the RTR Environment

RTR Terminology

Figure 1–5 Components in the RTR Environment

User Accounts Facility

FE

Client

application

TR

BE

Server

application

General Ledger Facility

	LKG-11203-98WI
	disconnected before all parts of the transaction are done, then
	the transaction remains incomplete.
Transaction	A transaction is a piece of work or group of operations that
	must be executed together to perform a consistent transformation
	of data. This group of operations can be distributed across many
	nodes serving multiple databases. Applications use services that
	RTR provides.

Transactional messaging

RTR provides transactional messaging in which transactions are enclosed in messages controlled by RTR.

Transactional messaging ensures that each transaction is complete, and not partially recorded. For example, a transaction or business exchange in a bank account might be to move money from a checking account to a savings account. The complete transaction is to remove the money from the checking account and add it to the savings account.

A transaction that transfers funds from one account to another consists of two individual updates: one to debit the first account, and one to credit the second account. The transaction is not complete until both actions are done. If a system performing this work goes down after the money has been debited from the checking account but before it has been credited to the savings account, the transaction is incomplete. With transactional

Introduction 1–7