Data sets that CHECK INDEX uses

The CHECK INDEX utility uses a number of data sets during its operation.

The following table lists the data sets that CHECK INDEX uses. The table lists the DD name that is used to identify the data set, a description of the data set, and an indication of whether it is required. Include statements in your JCL for each required data set and any optional data sets that you want to use.

Table 1. Data sets that CHECK INDEX uses
Data set	Description	Required?
SYSIN	An input data set that contains the utility control statement.	Yes
SYSPRINT	An output data set for messages.	Yes
UTPRINT	A data set that contains messages from the sort program (usually, SYSOUT or DUMMY).	Yes

The following object is named in the utility control statement and does not require a DD statement in the JCL:

Index space: Object that is to be checked. (If you want to check only one partition of an index, use the PART option in the control statement.)

Sort work data sets cannot span volumes. Smaller volumes require more sort work data sets to sort the same amount of data; therefore, large volume sizes can reduce the number of needed sort work data sets. When you allocate sort work data sets on disk, the recommended amount of space to allow provides at least 1.2 times the amount of data that is to be sorted.

Tape devices are not supported for sort work data sets.