Addressing OLTP Solutions with CICS: The Transaction Server ... - Ibm

8.3 Some Terminology
route the work to taking into account the availability and activity levels of the
systems
• The availability of required resources
• The performance and health of the CICS systems
Workload management can manage work requests from the following sources:
• Dynamic transaction routing
• Distributed program linking
• Routing of CICS Client for AIX ECI requests
• Session-level load balancing for CICS Client for AIX EPI sessions
• Session-level load balancing for the CICS 3270 emulator, cicsterm
• Session-level load balancing for CICS Telnet server (cicsteld) clients
• Data-dependent workload management
CICS SM uses object-oriented technology and relies on System Object Model
(SOM)/Distributed System Object Model (DSOM) and Semantic Network for key
functions. Each item to be managed within CICS SM and each entity displayed
by the GUI is represented by an object. Think of an object as a tangible
representation of something you can manage. For example, there are classes of
objects for CICS systems and CICS resources such as connections, files,
programs, and transactions.
CICS SM has the concept of a management node and managed nodes. The
management node is the node in the complex from which the SPOC and SSI are
performed. The managed nodes are those nodes that have CICS for AIX
systems that will be placed under the control of CICS SM.
Note: It is important to understand exactly what CICS SM V1.1 does and does
not manage. It facilitates systems management of CICS for AIX regions and
provides workload management for CICS for AIX regions and clients. It does not
manage any other CICS on Open Systems regions. It does not allow any other
CICS on Open Systems clients or IBM CICS clients to be workload managed
directly (the work they generate could be managed if the clients are attached to
a CICS for AIX region). Work to IBM Mainframe CICS systems cannot be
managed either.
Within the CICS SM publications, an instance of a CICS for AIX server is referred
to as a CICS system The CICS for AIX publications refer to an instance of a CICS
for AIX server as a CICS region. CICS system is synonymous with CICS region.
The two phrases are interchanged freely within this book.
CICS SM holds in an internal database definitions of all the CICS systems and
resources that you choose to manage from within it. These definitions make it
possible to re-create a CICS system multiple times. Many of the terms within
CICS SM are based on the need to formalize the definitions of a CICS system
and resources coupled with the fact that CICS SM is implemented with
object-oriented technology.
In an environment in which there is no CICS SM, the only way to easily create a
CICS system and configure all of its resources is to export the region and
reimport it each time or develop some scripts to do the work. This does not
make it easy to create another similar but slightly different region. You would
have to create the region and then modify it. With CICS SM it is possible to hold
Chapter 8. Using CICS System Manager for AIX 113