Operating Instructions › Using DD DUMMY Statements

Using DD DUMMY Statements

Although the SELECT statement controls the function which opens the accounting input files, a DD statement still causes the data set(s) to be allocated to an I/O device as per the JCL. The allocation of a tape drive by the executing program precludes any other job in the computer from using that drive, even if the program does not plan on bringing in a tape file on that drive. To avoid unnecessary allocation of resources when it is inconvenient to simply remove unnecessary DD statements, use the DUMMY form of the DD statement as follows:

//CAIJSDOS DD DUMMY

This example illustrates how to avoid allocating an unnecessary tape drive if no DOS/VSE job accounting data is introduced to CA JARS.

Note that the DUMMY option is not supported for the SNAP DD statement (DDNAME CAIJSNAP), or DDNAME CAIJDB2P.