Difference between PDS and PDSE

devaswamidoss · New User Joined: 22 Aug 2003 Posts: 4

what is the difference between PDS and PDSE?

mdtendulkar · Active User Joined: 29 Jul 2003 Posts: 237 Location: USA

Hello devaswamidoss,

Partitioned Data Set Extended (PDSE)

The partitioned data set extended (PDSE) is a storage management subsystem formatted data set.
Externally, the PDSE is very similar to a PDS. Internally, the PDSE contains a new directory structure, member format, and record format.

A PDSE is indistinguishable from a PDS through most interfaces used to access a PDS directory or member. All ISPF functions support the PDSE.

You can concatenate a PDSE library with a PDS library if they have consistent record formats and logical record lengths.

All functions in the Library Utility (option 3.1) support PDSEs with the exception of the compress function.

Hope this helps you,

Regards

Mayuresh Tendulkar

bluebird · Active User Joined: 03 Feb 2004 Posts: 127

and PDSE do not need be compressed for space to be reclaimed

srinathangya · New User Joined: 19 Dec 2005 Posts: 77

1.PDSE cannot be compressed! If this is the case, then why do we need to have a PDSE?
2.Internally, the PDSE contains a new directory structure, member format, and record format. - What does this mean? In what it helps the User?

Thank You in advance

Reg,
Srinath.

agkshirsagar · Posted: Mon Sep 10, 2007 9:05 am

Dear Srinath,

srinathangya · New User Joined: 19 Dec 2005 Posts: 77

Hi Thanx a lot. Ok, if there is no need to compress a PDSE, then why do we need to use PDS, why not we use only PDSE? May be my questions may be ridicule, I am just asking this just to learn things.

Hey! You didnt answered to my second question. And more importantly both the questions I asked earlier are taken from the answers given by two other users at the top. So the root cause for my getting these doubts are the answers given by those two users :-).

Reg,
Srinath.

srinathangya · New User Joined: 19 Dec 2005 Posts: 77

Sorry it seems U hav answered to my second question already. Sorry :-)

agkshirsagar · Posted: Mon Sep 10, 2007 9:45 am

I am glad that I could be of some help to you..

srinathangya · New User Joined: 19 Dec 2005 Posts: 77

Buddy, One more question. When there are so many advantages of PDSE over PDS, why most of them / us are using only PDS and not PDSE?

agkshirsagar · Posted: Tue Sep 11, 2007 2:28 pm

Maybe, because of the training program we go through at start of our carriers. They never ever uttered a word about 'PDSEs'.

When I discovered about PDSEs I try to use it wherever possible.

Manikandan Sivakumar · New User Joined: 21 Sep 2007 Posts: 6 Location: Hyderabad

What are the consideration we need to take care when PDSE file is in the current LNKLST during implementing product rollout.

If i need to empty and compress the PDSE library what utility we need to use. What are the important factors need to consider?

ofer71 · Posted: Thu Nov 15, 2007 11:46 am

It's all in the fine manual.

O.

Manikandan Sivakumar · New User Joined: 21 Sep 2007 Posts: 6 Location: Hyderabad

what is the significance of Load Library being as PDSE? In my shop previously one of our product which in PDS format. Now the vendor told that the current new version have PDSE format. For this i need to convert from PDSE to PDS. Can you explain on this? Thanks in advance.

krisprems · Posted: Thu Nov 15, 2007 8:33 pm

Manikandan Sivakumar

Manikandan Sivakumar · New User Joined: 21 Sep 2007 Posts: 6 Location: Hyderabad

More questions.... Thanks for your patience

1. Must a PDSE library be SMS-managed?
2.Is there any special handling for PDSE link/loadlibs type libraries?
3.Can i allocate the new PDSE libraries as Non SMS?

Thank you.

krisprems · Posted: Fri Nov 16, 2007 3:29 pm

dbzTHEdinosauer · Posted: Fri Nov 16, 2007 5:07 pm

you could read the documentation concerning pdse's. ibm redbooks have three documents I would suggest reading the first.

ruodeer · New User Joined: 06 Jul 2007 Posts: 58 Location: home

Here is the Link

Aaru · Posted: Thu Sep 18, 2008 12:26 pm

ruodeer,

Hope you are aware that you had replied to a year old topic.

vab987 · New User Joined: 01 Dec 2006 Posts: 29 Location: S.A

Thanks a lot guys, this discussion is really helpful.

Two quick questions :

1) How to check whether the existing library is a PDS or PDSE. ( except compressing them, as the compressed one will be the PDS)

2) While allocating a PDSE what are the options and values that we have to provide.

Regards,
V

expat · Posted: Wed Sep 24, 2008 6:31 pm

1) using 3.4
Data set name type : LIBRARY

2)
Take a look at the JCL manual

vab987 · New User Joined: 01 Dec 2006 Posts: 29 Location: S.A

Thanks , I got everthing on this mannual.

What extent means in context of PDSE and PDS.
Manual say that number of extents that a PDSE can have is 123 whereas a PDS can have 16 only.

Regards,
Vab

expat · Posted: Wed Sep 24, 2008 7:19 pm

An extent is a physical extent of the dataset on the DASD volume.