IMS data sets

Use the data set information to troubleshooting and learning about the IMS.

The attribute values for each data set are provided and include:
DSORG
Data set organization
Restriction: Start of changeIMS supports partitioned data sets extended (PDSEs) for only these libraries: MODBLKS, PGMLIB, SMPLTS, and SDFSJLIB.End of change
Note: The External Subsystem Attach Facility (ESAF) supports PDSE load library data sets.
DSNTYPE
Data set name type
RECFM
Record format
LRECL
Logical record length
BLKSIZE
Block size
The DSNAME high-level qualifier for DLIB, SYSTEM, and EXECUTION data sets must be specified on the NODE parameter of the IMSGEN macro. TLIB data sets are included in the NODE parameter for SYSTEM data sets. The IMS online change function requires multiple copies of the system data sets IMS.ACBLIB, IMS.MODBLKS, and IMS.FORMAT. The base copies of these data sets are called staging libraries, and the copies form active and inactive libraries.