Addressing OLTP Solutions with CICS: The Transaction Server ... - Ibm
Addressing OLTP Solutions with CICS: The Transaction Server ... - Ibm
Addressing OLTP Solutions with CICS: The Transaction Server ... - Ibm
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Figure 36. <strong>The</strong> <strong>CICS</strong> SM GUI<br />
8.4.6 Distribution of Components<br />
118 <strong>CICS</strong> for AIX as the <strong>Transaction</strong> <strong>Server</strong><br />
You must decide where to locate the <strong>CICS</strong> SM components. To assist you in the<br />
decision, we discuss the types of intercomponent communication that take place<br />
<strong>with</strong>in <strong>CICS</strong> SM. We then make our recommendations for component<br />
distribution.<br />
8.4.6.1 Intercomponent Communication<br />
Two types of intercomponent communication are used <strong>with</strong>in <strong>CICS</strong> SM. <strong>The</strong>y are<br />
DSOM and UNIX sockets. <strong>The</strong> use of these communication methods enables<br />
distribution of <strong>CICS</strong> SM components across multiple AIX systems. DSOM is used<br />
between those components that have a need for its services. UNIX sockets are<br />
used <strong>with</strong>in the workload management components where high performance is<br />
essential. DSOM does not have to be installed on every machine, only the<br />
management node and the managed nodes. In Figure 35 on page 115 you can<br />
see that intercommunication between the SMappl and the WLMAppl-SMappl<br />
interface, the resource controller, and the GUI uses DSOM. Intercommunication<br />
between the WLMappl and the workload management cache managers uses<br />
UNIX sockets <strong>with</strong> a datagram protocol, as does the long-running transaction in<br />
its communication <strong>with</strong> the resource controller. Workload management client to<br />
<strong>CICS</strong> client communication occurs as a <strong>CICS</strong> exit call. <strong>The</strong>re is no explicit<br />
communication as there is <strong>with</strong> DSOM.