IBM System/360 20 User Manual

MESSAGES
During execution, the Sortj.Merge program
causes a number of messages to be listed on
the printer. Heading, diagnostic, and
information messages may be printed.
The messages that may occur and their
meaning are described in the SRL publica-
tion IB~~Y§lgmL12Q~Q~gl_2QL~i§1 an~1~E~
R£Qg£~milling_~Y§!~ill§L_1~E§~Q£1L~§~~~gro~
gram, Form C26-3804.
DESCRIPTION OF OUTPUT
The output of the TPS Sort/Merge program is
produced on the tape drive assigned to SYS-
000 and, if an alternate output device is
used, on the ta~e drive assigned to SYS001.
For a sorting job as well as for a merging
job, the output consists of one sorted file
on one or more tape reels.
CHECKPOINT AND RESTART PROCEDURE
If the operand field of a SORT statement
contains CKPT, the program periodically
writes checkpoint records on the current
(output) work tape during External Sorting.
This option enables the user to
a) interrupt the sorting jot at any time
during External Sorting by pressing the
stop key on the CPU console,
b) restart the job later at the beginning
of the pass during which it was
interrupted.
External Sorting begins when the message
**END OF PHASE 1** has been printed. It is
completed when the message **END OF SORT**
is printed.
The execution of the program cannot be
interrupted and restarted in this manner
during Assignment, Internal Sorting, or
Merging.
A message is printed at the beginning of
each external sorting level. The message
printed is
LEVEL nnnn
where nnnn is the level number.
The number in the right-hand portion of
the LEVEL message is updated at the begin-
ning of each level. When the last level is
to begin, the message printed is
LAST LEVEL
To
restart the interrupted sorting job,
perform the following steps:
1. If the card-resident system is to be
used, place the Job Control program (if
used) into the hopper of SYSEtR.
2. Submit any jot control statements
required to set up the system exactly
as it was set up for the original job
(the same VCL and TEIAB statements,
ASSGN statements to make the same
device assignments, and any other job
control statements originally sub-
mi tted). If the card-resident system
is to be used, place the cards contain-
ing the job control statements between
phase 02 and phase 03 of the job con-
trol program.
3. Remove the CPTION card (if any) from
the deck containing the Sort/Merge con-
trol statements originally submitted.
Insert an OPTION card that contains the
(additional) oper and BESTABT=n. In
this operand, n must be 1 if the ori-
ginal jeb was interrupted before the
message LAST LEVEL was printed; n must
be 2 if the job was interrupted after
the message LAST LEVEL was printed.
4. If the card-resident system is used,
place the program deck in its original
arrangement behind the job control
cards. If the tape-resident system is
used, place the cards containing the
Sort/Merge control statements as well
as user routines (if any) behind the
job control cards.
5. Place any data to be read by user rou-
tines in the appropriate hopper(s}.
6. Press the Start keyes) of the card
reading devi ce (s) use d.
7. Mount the tapes that were used in the
original job on the appropriate drives.
If the job was interrupted during
execution of the last level and the
output file is a multi-volume file,
mount the first volume for the file on
SYSOOO and, if alternate output has
been specified, the second volume for
the file on SYS001.
8. Press the Load-Eewind key and the start
key of each tape drive used.
9. Press the Reset key and the Start key
of the frinter.
10. Press the Load key on the CPU console
to restart the jot.
Processing is bypassed until the begin-
ning of the sorting level during which the
original job was interrupted has been
reached.
Use of Language Translators and ether IBM-Supplied Processing Programs 37

IBM System/360 20 Specifications

General

Brand	IBM
Model	System/360 20
Category	Storage
Language	English