Copying a member of PDS

karthikr44 · Posted: Tue Aug 16, 2011 2:29 pm

Hi,

I have one PDS TEST.UNIT.DBRMLIB. When i am using PRINT IDS command for one member of that PDS it is sayng DATASET IN USE for most of the time.

So what i am doing is copying that member to my personal PDS TEST.U0031.DBRMLIB (TESTPGM). After some processing i will read next member of TEST.UNIT.DBRMLIB and replacing same member TESTPGM in
TEST.U0031.DBRMLIB.

But here the problem is even though i am copying and replacing same member, the allocation of space is growing and i am getting SB37 abend for the PDS TEST.U0031.DBRMLIB.

Is anybody have better approach, i need to process TEST.UNIT.DBRMLIB member by member.

Thanks in advance
R KARTHIK

Bill Woodger · Posted: Tue Aug 16, 2011 2:33 pm

If you keep putting stuff in, your PDS will keep growing until it runs out of space. When you delete a member, or change a member (when "saved" the member gets an entirely new location) no space is recovered.

If you want to recover the space, have to "compress" the PDS.

dbzTHEdinosauer · Posted: Tue Aug 16, 2011 3:07 pm

or join the 20th century and use PDS-E.

Garry Carroll · Posted: Tue Aug 16, 2011 3:49 pm

dbzTHEdinosauer · Posted: Tue Aug 16, 2011 4:22 pm

i was trying to be sarcastic (if you can believe)
since it is now the 21st century (for about a decade)

Marso · Posted: Tue Aug 16, 2011 5:34 pm

Is this a manual process or is it part of a tool ?
Batch or online ?
Is there a particuliar reason for using PRINT ?

Anuj Dhawan · Posted: Tue Aug 16, 2011 7:26 pm

Compress it or COPY this PDS to a new-PDSE (TYPE=LIBRARY) and get rid of your old PDS.

PDS and PDSE are two completely different animals. You do not need to compress a PDSE where you do need to compress a PDS, as has been said. The number of directory blocks is fixed within a PDS but dynamic within PDSE.

karthikr44 · Posted: Wed Aug 17, 2011 10:39 am

HI all,

I am using it in REXX. I am invoking LMCOMP ISPF service to compress
the dataset after replacing the member. It is working fine and i am not getting space abend.

Thanks for all your suggestions.

Now i understood what happens while compress and also i will try to use PDS-E dataset and see what happens (Space should not grow while replacing same member) without using LMCOMP service.

Thanks
R KARTHIK

dbzTHEdinosauer · Posted: Wed Aug 17, 2011 10:52 am

you can not compress a pds-e.

Garry Carroll · Posted: Wed Aug 17, 2011 11:38 am

dbzTHEdinosauer · Posted: Wed Aug 17, 2011 11:49 am

karthikr44,

read about the diffence between PDS and PDS-E here

if you really want to understand, read Partitioned Data Set Extended Usage Guide

karthikr44 · Posted: Wed Aug 17, 2011 12:57 pm

HI,

Thanks Dick Brenholtz for your help. And appreciate Garry for your sense of humor

.

R KARTHIK

dick scherrer · Posted: Wed Aug 17, 2011 2:30 pm

Hello,

Why would believe the post from Garry was humor? The post from Garry was not humor - it is a fact. . .

How do you think the system will "replace" a 500-byte member with a 2000-byte member? It will use more space. . .