Perform the following steps
to modify a data class.
- Display the Data Class Application
Selection panel (select option
4 from the ISMF Primary Option Menu for storage administrators).
_______________________________________________________________
- Supply values on the Data Class Application Selection panel:
- CDS Name
- Is the name of the SCDS that
contains the data class you want
to change.
- Data Class Name
- Is
the name of the data class.
- Option
- Select
option 4, Alter. This displays the Data Class Alter panel.
This panel contains the same attributes as the Data Class Define panel.
The fields are primed with the information that you entered when you
defined the data class.
_______________________________________________________________
- Type over the old information with your new information on the
Data Class Alter panel. For more information, see Defining data class attributes.
Use
the DOWN command to see the next page.
_______________________________________________________________
- Use the END command to save the changes and return to the Data
Class Application Selection panel.
Result: The changes take
effect when you activate this updated configuration. The changes you
make apply only to new data sets. The following features of the existing
data sets are affected: additional volume amount, extent constraint
relief, and dynamic volume count.
In addition, page 1 of this panel allows storage
administrators to specify a value for the Additional Volume Amount
attribute. Additional Volume Amount is applicable only to extended
format VSAM multivolume data sets. Additional Volume Amount is specified
when Data Set Name Type = EXT and Volume Count>1. The valid values
for this attribute are 'P' (primary), 'S' (secondary), and blank (not
specified; the system default is primary).
For descriptions
of the attributes contained in the Data Class
Alter and the Data Class Define panels, see Defining VSAM attributes and specifying media types for data class.