This document provides information about IMSDB command codes and processing options. It lists the command codes A through Z, describing what each command code does when accessing an IMS database. It also indicates which command codes can be used with different processing options like GU, GHU, GN, etc. Finally, it defines some common processing options like G, R, I, D, and describes special options for DEDB and Fast Path databases like GON, GONP, GOT, and GOTP.

1. IMSDB-COMMAND CODES & PROC OPTIONS
WWW.SRINIMF.COM
Copyright 2014

2. Command Codes
A Clear positioning and start the call at the beginning of the database.
C Use the concatenated key of a segment to identify the segment.
D Retrieve or insert a sequence of segments in a hierarchic path using
only one call, instead of using a separate (path) call for each segment.
F Back up to the first occurrence of a segment under its parent when
searching for a particular segment occurrence. Disregarded for a root segment.
G Prevent randomization or the calling of the HALDB Partition Selection
exit routine and search the database sequentially.
L Retrieve the last occurrence of a segment under its parent.
M Move a subset pointer to the next segment occurrence after your
current position. (Used with DEDBs only.)
N Designate segments that you do not want replaced when replacing
segments after a Get Hold call.Typically used when replacing a path of
segments.
Copyright 2014

3. Command Codes
P Set parentage at a higher level than what it usually is (the lowest-level SSA
of the call).
Q Reserve a segment so that other programs cannot update it until you have
finished processing and updating it.
R Retrieve the first segment occurrence in a subset. (Used with DEDBs only.)
S Unconditionally set a subset pointer to the current position. (Used with
DEDBs only.)
U Limit the search for a segment to the dependents of the segment
occurrence on which position is established.
V Use the hierarchic level at the current position and higher as qualification
for the segment.
W Set a subset pointer to your current position, if the subset pointer is not
already set. (Used with DEDBs only.)
Z Set a subset pointer to 0, so it can be reused. (Used with DEDBs only.)
- Null. Use an SSA in command code format without
specifying the command code. Can be replaced during
execution with the command codes that you want.
Copyright 2014

4. Command Code Eligibility
Command Code GU GHU GN GHN GNP GHNP REPL ISRT DLET
A X
C X X X X
D X X X X
F X X X X
G X
L X X X X
M X X X X X
N X
P X X X X
Q X X X X
R X X X X
S X X X X X
U X X X X
V X X X X
W X X X X X
Z X X X X X X
- X X X X X X
Copyright 2014

5. Proc Options
G -Your program can read segments.
R -Your program can read and replace
segments.
I -Your program can insert segments.
D -Your program can read and delete
segments.
A -Your program can perform all the processing
options. It is equivalent to specifying G, R, I, and
D.
Copyright 2014

6. Proc Options…
 GON,GONP –When invalid pointer, IMS
encounters GG status code, IMS will use
different path to access data. For DEDB
database
 GOT,GOTP – IMS will retry, when encounters
invalid pointer. For Fast Path Database.
Copyright 2014

7. THANKYOU
Copyright 2014
WWW.SRINIMF.COM