Compaq Reliable Transaction Router Bedienungsanleitung PDF herunterladen (Seite 30)

RTR Server Types

Figure 1–18 A Callout Server

Transaction

Partition A

Callout

Server

Application

Server

User Accounts Facility

LKG-11276-98WI

Authentication

RTR callout servers provide partition-independent processing for

authentication. For example, a callout server can enable checks

to be carried out on all requests in a given facility.

Callout servers run on backend or router nodes. They receive a

copy of every transaction either delivered to or passing through

the node.

Callout servers offer the following advantages:

• The security check can run in parallel with the database

updates thus improving response times.

• The security check can be run on the router hardware.

• The security checking code is completely separated from

other application code.

Since this technique relies on backing out unauthorized

transactions, it is most suitable when only a small proportion of

transactions are expected to fail the security check, so as not to

have a performance impact.

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Compaq Reliable Transaction Router Bedienungsanleitung Seite 30