Defining IMS logging parameters
You define IMS logging parameters in member DFSVSMxx in the IMS.PROCLIB, identified by DD name PROCLIB in the DBC and DLISAS JCL.
About this task
You specify the suffix
xx for DFSVSMxx in the DBCTL startup parameter VSPEC. For an illustration
of the parameters involved, see Illustration of DBCTL startup parameter creation and selection.
The logging parameters in DFSVSMxx include:
- Number of OLDS
- Number of OLDS buffers
- Selection of single or dual OLDS
- Number of WADS.
A further logging parameter, used to specify single or dual copies of the WADS is in the DBCTL startup parameters. See Starting DBCTL, DLISAS, and DBRC for information about the DBCTL startup procedure.
You must preallocate the OLDS and WADS data sets and specify the block size when the data set is allocated. For details, see Installation in IMS product documentation.
Provide dynamic allocation members for all OLDS and WADS data sets. See IMS dynamic allocation macro (DFSMDA).