reblock or change the logical record length of a dataset

mkssampathkumar · New User Joined: 31 Aug 2006 Posts: 57 Location: chennai

Hi
How to rreblock or change the logical record length of a dataset in Mainframe

anybody give example?

UmeySan · Posted: Fri Jan 12, 2007 1:33 pm

Hi !

Easiest way is to use a IEBGENER and copy the Dataset to a new desired
dataset. You could also use ICEMAN, Fileaid, TSO 3.3 or whatever you have.

Regards, UmeySan

Copy FB/LRECL=40 to VB/max Lrecl=44

STEP90 EXEC PGM=IEBGENER
SYSPRINT DD SYSOUT=*
SYSIN DD DUMMY
*
SYSUT1 DD DISP=SHR,DSN=IER1337.MDL00890.OUTPUT.SOND07
*
SYSUT2 DD DSN=IER1337.MDL00890.FZ022.I421,
DISP=(,CATLG,),UNIT=WORK,SPACE=(CYL,(10,10)),
RECFM=VB,LRECL=044
*

mkssampathkumar · New User Joined: 31 Aug 2006 Posts: 57 Location: chennai

Hi

Thanks for ur reply.
i cant understand ur code.
I am not asking to copying
I want to reblock or change the logical record length of a dataset>the code which u gave is for copying the dataset.I also saw in TSO 3.3 option , it has only to copy the dataset.
am not finding anything to change or reblock the dataset.
Even though u specifying DD parameter after the SYSIN DD DUMMY statement.i cant understand ur code becz am a fresher for mainframe.Please reply me detail.

Thanks

William Thompson · Posted: Fri Jan 12, 2007 3:16 pm

When a dataset is copied, each record is picked up off the old dataset and layed down on the new dataset. In that process the recfm and lrecl can be changed, you just can't wave a wand and proclaim "Change foul blocksize...begone evil recfm".....

Bitneuker · Posted: Fri Jan 12, 2007 5:06 pm

It can be adjusted but will be empty, and what the use of that is

If you try to REPRO it will fail because of invalid length. File MOD1 was originally 910 in length.

dick scherrer · Posted: Fri Jan 12, 2007 9:31 pm

Hello,

Copy the file you want reblocked to a second file.

Delete (or rename) the original file.

Rename the "new" file with the attributes you want.

TaDaa your file is "reblocked"