Working with the queue file

The only task required to set up the queue file is to allocate space using the IDCAMS utility with the specifications shown in Figure 1. See the VSAM Administration Guide if you need more information about allocating VSAM data sets.

Be sure to use the RECORDSIZE, SHAREOPTIONS, and KEYS values as defined. The size of the queue file will be volatile. Adjust FREESPACE based on experience with the files.

Figure 1. Sample of queue file allocation

   DEFINE CLUSTER (NAME(TCPIP.QUEUE) VOLUMES(WRKLB2) -
        CYLINDERS(1 1)   -
        IMBED -
        RECORDSIZE(870 1000) FREESPACE(0 15) -
        INDEXED SHAREOPTIONS(4 3) -
        UNIQUE NOWRITECHECK) -
        DATA ( -
         NAME(TCPIP.QUEUE.DATA) -
         KEYS(62 0) ) -
        INDEX ( -
         NAME(TCPIP.QUEUE.INDEX) )

After the space has been allocated, the NPF capture point applications will create queue file records and the NPF queue manager will delete them at the appropriate time.