CA Dynam for VSE User Guide

Direct Access File Independence Facility (VCKD)
MAP={T|R}
Defines track-mapping or record-mapping access to the file. For more
information, see Mapping FBA disk files.
Default: Track mapping
CYL=xxx
Defines the file's cylinder offset to be used by VCKD. ("xxx" is the cylinder
number of the original CKD file.) Programs that access the file using the old
CKD extents (for example, programs that have hard-coded the cylinder/head
address) can continue to function without program modification. VCKD
internally converts the address and maintains address compatibility.
Default: Offset is not used. File starts at cylinder 00, head 0
KL=xxx
Provides support for programs accessing DA files containing keys when the
following parameters have been omitted from the Assembler DTF or COBOL
select statements:
KEYLEN=
ACTUAL KEY IS
for Assembler
for COBOL
The parameter tells VCKD that the file was created with keys and that VCKD
should allow any program omitting the above parameters to receive only the
data portion of each record.
Default: Key length is taken from the user program DTF
Examples
Indicates record mapping.
// DLBL FBAFILE,'NEW.FBA.FILE.MAP=R',,DA
Indicates cylinder offset to start at cylinder 210.
// DLBL FBAFILE,'NEW.FBA.FILE.CYL=210',,DA
Indicates a file that contains a key length of 4 characters.
// DLBL FBAFILE,'NEW.FBA.FILE.KL=4',,DA
Chapter 6: Controlling File Independence 6–45