CA Dynam for VSE User Guide

Changing File Characteristics
The input tape file is FISYSIN and the output tape file is FISYSLS. The output
file generated is a standard labeled tape. Logical unit SYS001 is used for the
SYSIN file and SYS002 for the SYSLST file.
// JOB TEST1
// TLBL FISYSIN,'CARD-INPUT',,SYS001
// TLBL FISYSLS,'PRINT-OUTPUT',,SYS002,FIOPT=(SL)
// ASSGN SYS001,TAPE
// ASSGN SYS002,TAPE
// EXEC COBTEST,SIZE=100K
The file name is derived from:
• DTFname in Assembler programs
• File SELECT in COBOL programs.
By default, the logical unit name is used.
Example
// DLBL SYS001, ...
Recalculate the block size of an output disk file. Note that the block size of the
disk file is calculated based upon the OPTBLKS value defined in the DYNAM/FI
option record at installation time. For fixed-length records, the block size value
is always a multiple of the record size value specified.
// DLBL OUTPUT,'DISK-FILE',,SD,BLKSZ=OPT
Reblock a tape file and set the options. The file below is reblocked on a tape to
8000 bytes, and double buffering is specified (DB). In addition, a rewind and
unload operation is performed on the tape when it is closed (RUN).
// TLBL OUTPUT,'TAPE-FILE',,BLKSZ=8000,FIOPT=(RUN,DB)
Create a tape file and change the logical unit. Logical unit SYS018 is used to
override the logical unit specified in the user's program.
// TLBL TAPDISK,'TAPE-DISK',,SYS018
Read a disk file created with reblocked size. Note that if the block size operand
were omitted, the block size value would default to the one in the user's
program. In many cases, however, this can cause a wrong-length record error
to occur.
// DLBL DISK,'MASTER',,SD,BLKSZ=OPT
Create a SYSLST disk file when SYSLST is program-defined as a printer. Note
that the SYSLST file is created on disk with a block size of 1210 bytes and the
file name FISYSLS is used. The SYS001 assignment overrides the use of
SYSLST.
Chapter 6: Controlling File Independence 6–25