Disp=mod to append data in the file

P.RAJESH · New User Joined: 20 Mar 2008 Posts: 54 Location: chennai

hi,

//P111 EXEC PGM=ICEGENER,COND=(4,LT)
//SYSOUT DD SYSOUT=*
//SYSPRINT DD SYSOUT=*
//SYSIN DD DUMMY
//SYSUT1 DD DISP=OLD,DSN=TSCH088.CYAD010.SQL
//SYSUT2 DD DSN=TSCH088.BCH.IF.TEST6,DISP=MOD

I want the data inside TSCH088.CYAD010.SQL ps come at start not to append to TSCH088.BCH.IF.TEST6.

please hlep me...

enrico-sorichetti · Posted: Fri Mar 21, 2008 12:23 pm

do not use "disp=mod"

check the manuals

jcl reference
jcl guide

from the manuals link at top of the page

P.RAJESH · New User Joined: 20 Mar 2008 Posts: 54 Location: chennai

i got my requirement by using GDG'S but now don't wnat to use GDG'S

they need it by using flat files.

i tried with disp=shr,old,pass etc.. but i didn't achieve the result.

please suggest me which dis position i can use.

enrico-sorichetti · Posted: Fri Mar 21, 2008 12:40 pm

GDG' s are flat files

just the allocation preamble is different, generating funny looking names

SHR,OLD,NEW will yield the desired result, once You abide to the allocation rules[/b]

the_gautam · Posted: Fri Mar 21, 2008 2:57 pm

i you want to get the data to be at the top and not at the bottom, then you should not use DISP=MOD as it will append the data at the bottom only.

Bill Dennis · Posted: Fri Mar 21, 2008 6:12 pm

[quote="P.RAJESH"]I want the data inside TSCH088.CYAD010.SQL ps come at start not to append to TSCH088.BCH.IF.TEST6.
quote]Do you want to keep the existing data in TSCH088.BCH.IF.TEST6 and put the new records at the front?? This cannot be done using JCL disposition. You can create a workfile and then copy the workfile and old file together in the desired sequence.

mmwife · Super Moderator Joined: 30 May 2003 Posts: 1592

Enrico,

Please don't shout and screech (I guess that's what the bolding does).

enrico-sorichetti · Posted: Fri Mar 21, 2008 6:28 pm

Hi Jack

that was not shouting and screeching...
it was a desperate rant

I was trying to make a point about everybody considering GDG as something different
from normal datasets as far as I/O is concerned

and thinking that the program might behave differently when reading/writing a gdg dataset
instead of a non GDG PS dataset

It was not a personal shout ( I do know what bolding and character size means )
but rather speak to one so that many might listen and understand and learn

shankar.v · Posted: Fri Mar 21, 2008 11:01 pm

Hi p.rajesh,

Please check with the following code for your requirement.

mmwife · Super Moderator Joined: 30 May 2003 Posts: 1592

Only kidding, Enrico. I like shouting; I'm hard of seeing.

Bill Dennis · Posted: Sat Mar 22, 2008 2:04 am

PLEASE DO NOT use the JCL suggested by shankar and write into your same input file! If you're foolhardy, you can do this with a SORT where all input I/O completes prior to any output I/O. ICEGENER, however, will corrupt your file because it reads and writes at the same time.

dick scherrer · Posted: Sat Mar 22, 2008 2:12 am

Hello,

To add a bit to Bill's excellent point - it is a very bad practice to write over the input data in a step.

If there are any problems, the data is most likely destroyed and creates even more of a problem. The input needs to be re-created in addition to resolving the original problem.

P.RAJESH · New User Joined: 20 Mar 2008 Posts: 54 Location: chennai

Hi all,

Thank you very much for all your valuable suggestions.

Thanks & Rgd's
rajesh

mk_kumar315 · New User Joined: 21 Nov 2005 Posts: 10

Hi,

I think we can concatenate the 2 files into TEMP. file and then loading the second file from the data of TEMP file.

Pls let me know if my assumption is wrong.

Thanks,
Kumar.