CA Dynam for VSE User Guide

Disk File Maintenance Utilities
This control statement has the following format:
OPEN FILE=dtfname [ UNIT=SYSxxx ]
[ MODE=INPUT|OUTPUT ]
[ TYPE=DA|SD|IS ]
[ DISK=dvctyp ]
OPEN
FILE=dtfname
DISK=
MODE=
TYPE=
UNIT=SYSxxx
Preopens a disk data set.
Defines the dtfname to be used for the file. This name must be the same as
the dtfname specified on the file's DLBL statement.
Optional operand. Defines the disk device type of the file. Valid parameters are
2311, 2314, 3310, 3330, 3340, 3350, 3370, 3375, 3380, 3390, and 9345. The
default is 3330.
Optional operand. Specifies if the file is to be input or output. INPUT causes
the existing file to be located. A specification of OUTPUT causes the file to be
allocated. This parameter defaults to INPUT.
Optional operand. Defines the file's access method: SD (sequential), DA
(direct access), or IS (indexed sequential). The default value is SD.
Optional operand. Defines the logical unit to be used for the file. It can be
specified as either a programmer or system logical unit:
where xxx must be less than 255
SYS001 is the default.
Notes about the OPEN control statement:
• The input values are used to construct a DTF table for the appropriate
access method.
• DYNOPEN prints control statements upon SYSLST only if // OPTION LOG is
in effect.
• DYNOPEN normally reads its input from SYSIPT. The use of UPSI 001
causes DYNOPEN to read its input from SYSRDR instead.
Examples of Opening Files:
Open an SD input file using Catalog Management:
// DLBL MASTER,'PAYROLL.MASTER'
// EXEC DYNOPEN
OPEN FILE=MASTER UNIT=SYS011 MODE=INPUT TYPE=SD
/*
Chapter 5: Supporting Disk File Management 5–9