Key concepts

An alphabetic list of key concepts that it is essential to understand.

Programs
CICS® programs are executable units that can be started within a CICS server. A particular CICS program might be available on multiple CICS servers. The Workload Manager has a list of CICS servers on which the program is defined (program affinity).
Server group
The Configuration Tool uses server groups to group together server instances. A Server Group can correspond to one or more CICS servers.

The first time the Client daemon makes a request, it selects a server instance from the group at random. All subsequent requests to that Server Group are sent to the same server instance, until that server becomes unavailable, when another server from the group is selected.

An ECI program can be associated with a Server Group. The Workload Manager assumes that the program exists on all server instances in the Server Group.

Workload management
The ability of the Workload Manager to select a suitable CICS server as a target for a client request. The load balancing algorithms try to spread the workload over various server instances on a particular CICS server (via random selection) and they allow the user to effectively specify a bias for the selection of a particular CICS server. Known inactive CICS servers are not considered for selection.

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Timestamp icon Last updated: Tuesday, 19 November 2013


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