HP 3000 Manuals HP 3000 Manuals
Appendix M System Limits and Programming Restrictions
COBOL System Limits
This appendix gives information on the maximum size or number that can be
used for various parameters. The COBOL system limits equal, or exceed,
all those listed in the X/Open CAE, COBOL Language (XPG4).
Specifications
* Maximum size of:
Data Division 256 Mbytes
Procedure Division 16 Mbytes per COBOL segment
(up to 50 segments plus root
segment)
* Maximum file sizes (bytes):
Sequential file No limit
Line sequential file No limit
Relative file No limit
Indexed sequential file No limit
If record locking is used:
Relative file No limit
Indexed sequential file No limit
* Maximum file sizes (records):
Sequential file depends on record size and file
size
Line sequential file depends on record size and file
size
Relative file depends on record size and file
size
Indexed sequential file any
* Maximum record sizes (bytes):
Fixed Variable
Sequential files 65526 65526
Line sequential files 65526 N/A
Relative files 65526 65526
Indexed files 32767 65526
* Index keys:
Maximum keys per file 255
(including split-key
components)
Maximum length of any one key 1016
(bytes) (performance best
below 512)
Maximum number of records 64K
containing the same duplicate
key value
Maximum number of components 62
in a split key
Maximum number of alternate 254
keys
* Maximum open files:
Sequential files/ 255 or your operating system
Line Sequential files limit, whichever is the smaller
Relative files/ 128 or half your operating system
Indexed sequential files limit, whichever is the smaller
* Maximum length of:
PROGRAM-ID name 30 characters
Programmer defined words 30 characters
Path names 100 characters
File-names (including program 14 characters
source files, copy file-names
and .ext file-names)
Literals 160 bytes
Entry point names 30 characters
Contents of dd _environment up to the maximum operating system
variables size for each path
* Maximum number of:
Table subscripts 16
Arguments in a CALL statement 255
USING parameters per entry 255
point
Literals No limit
* Maximum number of:
Records in a file (all file No limit
types)
Record locks Operating system dependent
File locks Operating system dependent
* Maximum length of data items:
Alphanumeric 256 Mbytes
Alphanumeric Edited/ Consist of 32 parts,
Numeric Edited each of which can contain up to 16
occurrences of a single edited
character type
Numeric 18 digits
ANSI ACCEPT 103 characters
ANSI DISPLAY No limit
Full screen DISPLAY One screen less one character (the
last character position on the
screen is not usable)
Full screen ACCEPT One screen less one character (the
last character position on the
screen is not usable)
* Maximum nesting:
IFs (compiled code only) 255
PERFORM statements in .int 100
programs
PERFORM statements in .gnt no limit other than the size of
programs the system stack
PERFORM n times 22
* Maximum table dimensions:
(that is, maximum number of subscripts) 16
* Maximum program size: No limit
* Sort keys:
Maximum sort key size (with 1016
RTS)
Maximum sort key size (with 1016
EXTSM)
Maximum number of sort keys 25
* Maximum number of data- and procedure-names: 64K
* Maximum size of an external data item: 64K
* Maximum OCCURS in Screen Section:
This is limited by the number of fields and/or the levels
of occurrence. It is not possible to give an actual limit,
but exceeding the limit will result in an error when you
compile your program.
* Maximum number of files in a MERGE file-name GIVING/USING phrase:
10