Temporary data sets (work files)

The Batch Command Server uses temporary data sets (work files), as described in z/OS Batch of the Command Server documentation. Temporary data sets are used throughout the JCL examples included in the Batch Command Server installation.

Temporary data set names must begin with &&, which indicates a temporary data set. They can use VIO or NON-VIO and can be statically or non-statically (dynamically) allocated.

When running IBM® Transformation Extender maps, the following recommendations for using temporary data sets might improve the performance of batch jobs running under the Batch Command Server:

• All required temporary data sets should be statically allocated using VIO, unless you are reusing work files.
• Static temporary data set allocations must be defined using RECFM=FBS (Fixed Block Standard).
• Static temporary data set allocations should specify LRECL=32760.
• Static temporary data set allocations should not specify a block size.

Using the recommendations stated above will provide the most optimal I/O performance for the Batch Command Servers' work files.

For an example JCL, see the SYSTMP01 (temporary data set) data definition (DD) fragment from the DTXBMJCL JCL that is included in the Batch Command Server installation.

See the Command Server documentation for more information about statically allocated temporary data work files.

See DFSMS: Using Data Sets and theDFSMS: Implementing System-Managed Storage documentation for additional information.