CA Dynam for VSE User Guide

Changing File Characteristics
Concatenated Data Sets
CA Dynam/FI provides an input data set concatenation facility. This facility
allows multiple input data sets to be read as if they were a single data set, in
response to a single open issued by the application. Concatenation is invoked
by specifying the CONCat option on the label of each data set which is to be
concatenated.
Multiple concatenated input files may be processed concurrently; that is, an
application that issues opens for several different data sets may use
concatenation for one or all of them. In the case of tapes, the data sets to be
concatenated may be single file data sets or part of multifile data sets, and
may each consist of a single or multiple volumes. Input data sets to be
concatenated may have different attributes. Data sets may be concatenated
without regard to disk or tape residence, varying record formats, blocksizes, or
logical units, as these attributes are resolved as part of normal CA Dynam/FI
processing in a manner transparent to the application. The following sample
JCL demonstrates concatenation:
// JOB CONCATEX
/*
/* PROCESS MONTHLY A/P TRANSACTIONS
/*
/* INPUT: 1 CONCATENATED DATASET
/* CONSISTING OF 2 TAPE DATASETS
/* AND 2 DISK DATASETS
/*
// TLBL INPUT,'TRANS.TAPE.OLDEST',,CONCAT
// TLBL INPUT,'TRANS.TAPE.OLDER',,CONCAT
// DLBL INPUT,'TRANS.DISK.OLD',,,CONCAT
// DLBL INPUT,'TRANS.DISK'
// EXEC APMTHLY
/&
Where other CA Dynam products are installed, the concatenated data sets may
be either controlled, uncontrolled, or a mixture of the two. All processing
options supported by the other products in the CA Dynam family are supported
for use in conjunction with concatenation.
In addition, all versions of a particular data set may be read by using
CONCAT=ALL or the first nn versions may be concatenated by using
CONCAT=nn on the TLBL or DLBL.
Additional Examples
In this example, COBOL program COBTEST is originally written to read from a
card reader (DTFCD) and write the output to a line printer (DTFPR). However,
with CA Dynam/FI, the program will read from a tape file labeled 'CARD-
INPUT' and write to a tape file labeled 'PRINT-OUTPUT'.
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