How to perform MASS DELETE using JCL

Vidhya Karthi · New User Joined: 28 Aug 2007 Posts: 12 Location: Chennai

Hi All,
Can anyone explain me how to perform MASS DELETE using JCL?
I have a PS file with 1000 records , which are to be deleted from the table.
Can this be done thru JCL. Please help out.

dick scherrer · Posted: Mon Apr 21, 2008 7:40 pm Post subject:

Hello,

You could process the PS file and generate sql delete statements for each "key" to be deleted.

As there are only 1000, you could easily do this by editing also.

Prajesh_v_p · Active User Joined: 24 May 2006 Posts: 104 Location: India

1) Using IKJEFT01

-> Reformat the data to be appended to an 'IN' clause in delete the query(Can get lot of ex for this from DFSORT forum)
-> Use IKJEFT01 to run the delete query(sysin should have the delete query and reformated data append)
-> Should have a primary key column here. Otherwise it will be difficult.

2) Using QMF Proc

-> Reformat the data in QMF format and QMF header,
-> import the data to a temporary table
-> Run a delete query against your table and tem table
-> Erase tem table

Please correct me If I am wrong.

Thanks,
Prajesh

Vidhya Karthi · New User Joined: 28 Aug 2007 Posts: 12 Location: Chennai

Hi,
I don't understand reformatting data. Can you please provide the sample JCL for doing mass delete?

Prajesh_v_p · Active User Joined: 24 May 2006 Posts: 104 Location: India

Suppose you have the emp numbers inthe file as below:
12003
12323
34344

create a DSN DSN2 in the following format:

12003,
12323,
34344);

Have a permanent DSN DSN1 as below:

Delete from emp_tbl
where emp_no in(

Now append DSN1 and DSN2 to the sysin of your IKJEFT01 step:

Please see the post http://ibmmainframes.com/viewtopic.php?t=19045&highlight=query for further info.

Thanks,
Prajesh

Vidhya Karthi · New User Joined: 28 Aug 2007 Posts: 12 Location: Chennai

Hi Prajesh,
Still i'm not clear with this...

create a DSN DSN2 in the following format:

12003,
12323,
34344);

I can append a comma to each record thru syncsort. But, How can we append the ); in the last record. Can u plz help with sort card?

Thanks in advance.

Prajesh_v_p · Active User Joined: 24 May 2006 Posts: 104 Location: India

Use a sort with below sort card:

INREC IFTHEN=(WHEN=INIT,OVERLAY=(6:C',',8:SEQNUM,3,ZD)),
IFTHEN=(WHEN=(8,3,CH,EQ,C'001'),OVERLAY=(6:C');'))
SORT FIELDS=(8,3,CH,D)
OUTREC BUILD=(1,7)

Input:
12003
12323
34344

Output:
34344,
12323,
12003);

Thanks,
Prajesh V P

Vidhya Karthi · New User Joined: 28 Aug 2007 Posts: 12 Location: Chennai

Hi Prajesh,
Thanks for u'r help.