CA Dynam for VSE User Guide

Using Automatic Multifile (AMF) Data Sets
Creating a new multifile set in multiple steps:
// TLBL OUT,'filea',STACK=*
// EXEC pgm
// TLBL REF,'filea',STACK=*
// TLBL OUT,'fileb',STACK=*
// EXEC pgm
// TLBL REF,'fileb',STACK=*
// TLBL OUT,'filec',STACK=*
// EXEC pgm
Using Automatic Multifile (AMF) Data Sets
CA Dynam/T incorporates a special feature to automatically generate multifile
data set names at output open time. The system adds another data set to the
multifile set if both the following conditions are satisfied:
• The first data set on the multifile set was cataloged with this option.
• The special data set for the file is in the TLBL.
Generating AMF File Numbers
Three asterisks (***) in the TLBL's DSN indicate to CA Dynam/T that this
could be an automatic multifile (AMF) data set. CA Dynam/T replaces the three
asterisks with a three-digit number if the following conditions are satisfied:
• If you are opening the file as output, CA Dynam/T generates this number
by adding one to the number of the previous file in the AMF set.
• If the file is opened as input, CA Dynam/T retrieves this number from the
Catalog. The number is determined by any one of the following, in the
same order of priority shown here:
1. File sequence number from the TLBL
2. Version number from the TLBL or the relative generation
3. Three numbers of the last-created AMF data set
Creating an Automatic Multifile Data Set
Create automatic multifile data sets with the DYNCAT DEFINE command. The
parameter MF=AUTO in the DEFINE statement indicates this is an AMF data
set. The PREVFILE parameter is not permitted. The DSN must contain three
asterisks (***), or it will be rejected. This defines the base data set name for
the AMF set. This name should permanently reside in the Catalog.
Chapter 2: Maintaining Tape Files 2–69