Allocating stacked data sets

If you stack them on the same tape volume, all change accumulation groups are processed serially (one at a time) in collating sequence by change accumulation group name. If the input is not stacked and you do not stack the output, change accumulation groups are processed in parallel.

You can stack the output data sets on tape by using either dynamic allocation or DD statements. If you use DD statements to control stacking, be sure that the label sequence number of each change accumulation DD statement specifies the same order in which the groups will be processed--collating sequence by change accumulation group name. BMC recommends that you use dynamic allocation when stacking change accumulation data sets.

If you use dynamic allocation, you can specify that you want to generate stacked output data sets by using either of the following methods:

• Specify one or more STACK control statements. For a change accumulation data set, refer to a STACK control statement with the CA keyword. For an image copy data set, refer to a STACK control statement with the IC keyword.
• For a change accumulation data set, specify the STKCA keyword instead of the CA keyword. For an image copy data set, specify the STKIC keyword instead of the IC keyword.

In all cases, the utility dynamically allocates each output data set and writes it to the specified stack. All output data sets that use the same stack name are written to the same tape volume.

This section contains the following topics: