Overview of the IMS system
definition process
The IMS system definition
process describes the system resources (databases, applications, devices,
terminals, and links) to IMS when
you first install IMS, you apply
maintenance to your IMS system,
or definition changes are required.
IMS system definition
IMS system definition at a high-level view comprises several supertasks.
How system definition is related to installation
System definition and JCL preparation are only a part of the total installation process. You should understand the relationship between installation and system definition before defining your system.
Coding IMS macros that define the system
Use IMS macros to define and tailor a new IMS system or to modify an existing IMS system.
Choosing a system definition
Use the SYSTEM= parameter on the IMSCTRL macro to choose the type of system you want to define.
Selecting the appropriate macros to define your system
When you choose to define or modify an IMS system, the system definition parameters that you can define or modify vary by the type of system definition. Certain macro statements, keywords, and parameters require additional consideration if you are newly adding or entirely deleting them from the system.
System definition preprocessor overview
Use the IMS system definition preprocessor to ensure that stage 1 input does not include duplicate resource names, such as transaction codes, LTERMs, and system names.
IMS stage 1 system definition
Stage 1 of IMS system definition takes the IMS macros that you coded and assembles them into Stage 2 JCL.
Verifying the stage 1 input
After stage 1 input is built, resource names are checked for validity uniqueness. You can bypass name checking to reduce overall processing.
Determining when system definition is required
You do not have to perform a complete system definition each time a parameter value changes.
Including Fast Path in a DCCTL or DB/DC system definition
During a DCCTL or DB/DC system definition process, you can specify which Fast Path application programs and resources should be included in the IMS system.
Including Fast Path in a DBCTL system definition
During the DBCTL system definition process, you can specify which Fast Path application programs and resources should be included in the IMS system.
IMS stage 2 system definition
IMS stage 2 system definition assembles and binds all the modules that are required to build the necessary load modules, depending on what type of system is being defined.
JCLIN processing
The JCLIN process ensures that SMP/E knows how to manage any maintenance that is added to the system following an IMS system definition.
Applying maintenance using SMP/E
Use SMP/E to apply and accept IMS maintenance before an IMS system definition.
Adding entries to the z/OS Program Properties Table
Use the z/OS® Program Properties Table (PPT) to identify a list of programs that require special attributes, or to change the attributes of the IBM-supplied default entries.