//DEFCAT1  JOB    ...
//STEP1    EXEC   PGM=IDCAMS
//VOL1     DD     VOL=SER=VSER01,UNIT=DISK,DISP=OLD
//SYSPRINT DD     SYSOUT=A
//SYSIN    DD     *
     DEFINE USERCATALOG -
           (NAME(USERCAT4) -
                    CYLINDERS(3 2) -
           VOLUME(VSER01) -
           ICFCATALOG -
           STRNO(3) -
           FREESPACE(10 20) -
           SHAREOPTIONS(3 4) -
         DATA -
           (BUFND(4) -
           CONTROLINTERVALSIZE(4096)) -
         INDEX -
           (BUFNI(4) -
           CONTROLINTERVALSIZE(2048)) -
/*

• VOL1 DD describes the volume on which the catalog is to be defined.

  The DEFINE USERCATALOG command defines a user catalog, USERCAT4. Its parameters are:

• NAME names the user catalog, USERCAT4.
• CYLINDERS specifies that 3 cylinders are to be allocated for the catalog. When the catalog is extended, it is in increments of 2 cylinders.
• VOLUME specifies that the user catalog is to reside on volume VSER01.
• ICFCATALOG specifies that the user catalog is to be in the catalog format.
• STRNO specifies that up to 3 concurrent requests to this catalog are to be processed.
• FREESPACE specifies the amount of free space to be left in the data component's control intervals (10%) and the control areas (20% of the control intervals in the control area) when data records are loaded into the user catalog.
• SHAREOPTIONS specifies the extent of cross-region sharing 3 (fully shared by any number of users) and cross-system sharing 4 (fully shared) to be allowed for the user catalog.
• DATA and INDEX specify that parameters, BUFND and CONTROLINTERVALSIZE, and BUFNI and CONTROLINTERVALSIZE, are to be specified for the data and index components, respectively.
• BUFND specifies that 4 data buffers, of the data component's control interval size, are to be used when processing this user catalog.
• CONTROLINTERVALSIZE specifies the data and index component's control interval size, 4096 for the data component, and 2048 for the index component.
• BUFNI specifies that 4 index buffers, of the index component's control interval size, are to be used when processing this user catalog.