Modes for using IMS HP Change Accumulation Utility
Three modes of operation are available for using the IMS HP Change Accumulation Utility utility.
- ISPF user interface (ISPF/UI) mode
- Two-step batch mode
- Extended batch mode
ISPF user interface (ISPF/UI) mode
The ISPF mode is an interactive method for specifying global and runtime parameters for the IMS HP Change Accumulation Utility environment. ISPF is the easiest mode to use and is useful when processing parameters are frequently changed.
Other information about the ISPF mode includes the following items:
- Parameters are presented as options or selection lists, thereby making it unnecessary to remember parameter settings.
- Full context-sensitive help provides support.
- Settings are remembered across sessions.
- DBRC is required.
Refer to ISPF user interface mode.
Two-step batch mode
The two-step batch mode requires knowledge of DBRC utility control statements and is appropriate if your site uses an automated process to generate DBRC control statements.
Other information about the two-step batch mode includes the following items:
- Two-step batch creates JCL and the control file.
You must then manually submit JCL to run the accumulation process defined by the control file.
- You use the two-step batch mode in combination with the ISPF or extended batch mode.
- An IMS HP Change Accumulation Utility-ID must be created in a permanent IMS HP Change Accumulation Utility control file prior to running two-step batch.
- Thereafter, you need to use ISPF or extended batch only when the setup parameters are changed for the IMS HP Change Accumulation Utility-ID or when a new IMS HP Change Accumulation Utility-ID is created.
- You can use batch JCL and DBRC GENJCL control statements to create new change accumulation JCL procedures to be submitted for processing.
Refer to Two-step batch mode.
Extended batch mode
The extended batch mode combines the setup and accumulation processes.
Other information about the extended batch mode includes the following items:
- Extended batch mode uses a single JCL stream for setup, control, and submission of the subordinate processes.
- This mode is a one-step process that uses JCL and control statements (does not require a SUBMIT).
- You can use this mode to perform most of the functions that are performed by the ISPF and two-step batch modes.
- This mode is appropriate if your site uses an automated JOB scheduling system.
- DDs provide some of the same values that can be set by using ISPF.
- Many DDs are optional - IMS HP Change Accumulation Utility dynamically allocates those that are required.
- The HPCSYSIN DD * provides free form commands to enter most of the values found in ISPF dialogs.
- DBRC is optional.
- Extended batch commands:
- Batch mode uses keyword commands to set control file values
- Commands are not case-sensitive
- Free form, not column-restricted
- Order independent (with some exceptions)
- Defaults apply; most commands are never required
Refer to Extended batch mode.