IBM OS manual Using the IBM Cross System Product, ENQUEUEs/DEQUEUEs, Shared storage, SPI commands

Using the IBM Cross System Product

The following information about the IBM Cross System Product (CSP) 4GL application generator concentrates on tests carried out running CSP 3.3, but in general the information also applies to later releases of CSP.

There are two components to CSP:

vCSP/AD (Application Development) is used to develop the applications

vCSP/AE (Application Environment) is the run-time environment for application execution.

If you use the IBM Cross System Product to develop your applications and, in particular, use CSP/AE as the run-time environment for the applications, the Reporter report will contain a large number of transaction groups. These groups are created because of the way that CSP/AE uses EXEC CICS commands, and in many cases do not cause real affinities.

Affinity analysis for a CICS region containing CSP 3.3 applications

When CSP 3.3 is used to develop and execute CICS pseudoconversational applications, the main CSP affinity is LUNAME/PCONV TS queue affinity, which can be dealt with either by CICSPlex SM or by a queue-owning region (QOR). The only other real affinity likely to be encountered is the use of non-read-only CSP shared tables, and the scope of this affinity depends on the tables and applications involved.

CSP internally uses these CICS resources and commands in the following ways. They can cause transaction affinities, and these appear in the Transaction Affinities Utility report.

ENQUEUEs/DEQUEUEs

are used to serialize the loading of CSP tables and applications from VSAM ®les called ALFs (application load ®les). They are also used to serialize writing messages to TD destination CSMT.

Shared storage

When a CSP application or table or map from an ALF has completed loading, it is copied to shared storage. Note that some of these tables may be de®ned by the application developer as SHARED and made resident by the CSP utility program ALFUTIL. Such tables may be shared between applications, and may be updated.

Temporary storage queues

CSP allows division of applications into 'segments'. This is just another name for a pseudoconversational application. CSP uses TS to save state data between transactions in the pseudoconversation, building the TS queue name from the termid to ensure uniqueness.

SPI commands

are used to inquire on system attributes such as the version and release of CICS in use, to set up and share a user exit global work area (GWA), and to obtain ®le characteristics of the ALFs.

50 CICS Transaction Affinities Utility Guide