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Difference between PDS and PDSE
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devaswamidoss

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PostPosted: Fri Aug 22, 2003 2:08 pm    Post subject: Difference between PDS and PDSE
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what is the difference between PDS and PDSE?
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mdtendulkar

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PostPosted: Fri Aug 22, 2003 2:26 pm    Post subject:
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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
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bluebird

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PostPosted: Tue Feb 03, 2004 5:36 pm    Post subject:
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and PDSE do not need be compressed for space to be reclaimed
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srinathangya

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PostPosted: Mon Sep 10, 2007 8:52 am    Post subject:
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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.
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agkshirsagar

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PostPosted: Mon Sep 10, 2007 9:05 am    Post subject:
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Dear Srinath,
Quote:
why do we need to have a PDSE?

instead the question should have been 'why do we need to compress pds at first?'
We compress pds to reclaim the used space due to frequent edition of PDS members. Whenever we edit a member and save our changes, system allocates a different space (like a different version) in the pds and the space allocated to old version is still there. Compress will reclaim 'that' space. In case of PDSE we dont need to do this because system does it..

Also the post above yours says 'Do not need to be compressed' not that 'it can not be compressed'.

2.
Only help that it to user that user need not care about estimating and allocating directory blocks. System takes care of it. Also the maximum number of secondary extents PDSE can have is 123 and for PDS it is 16..

I will suggest you to go through manual for more information, it is explained very well...
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srinathangya

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PostPosted: Mon Sep 10, 2007 9:37 am    Post subject:
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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.
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srinathangya

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PostPosted: Mon Sep 10, 2007 9:39 am    Post subject:
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Sorry it seems U hav answered to my second question already. Sorry :-)
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agkshirsagar

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PostPosted: Mon Sep 10, 2007 9:45 am    Post subject:
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I am glad that I could be of some help to you.. icon_smile.gif
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srinathangya

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PostPosted: Mon Sep 10, 2007 9:48 am    Post subject:
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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?
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agkshirsagar

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PostPosted: Tue Sep 11, 2007 2:28 pm    Post subject:
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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. icon_smile.gif
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Manikandan Sivakumar

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PostPosted: Wed Nov 14, 2007 9:18 pm    Post subject: Reply to: difference between PDS and PDSE
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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?
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ofer71

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PostPosted: Thu Nov 15, 2007 11:46 am    Post subject:
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It's all in the fine manual.

O.
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Manikandan Sivakumar

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PostPosted: Thu Nov 15, 2007 8:10 pm    Post subject: Reply to: difference between PDS and PDSE
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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.
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krisprems

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PostPosted: Thu Nov 15, 2007 8:33 pm    Post subject:
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Manikandan Sivakumar
Quote:
If you get message IEW2641S on a linkedit, it means the module is so
big that it cannot be saved as a load module in a PDS. The solution is to
make the SYSLMOD library a PDSE, so the module will be saved as a Program
Object (or make the module smaller).
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Manikandan Sivakumar

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PostPosted: Thu Nov 15, 2007 9:01 pm    Post subject: Reply to: difference between PDS and PDSE
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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.
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krisprems

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PostPosted: Fri Nov 16, 2007 3:29 pm    Post subject:
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Quote:
You can allocate PDSEs only in an SMS-managed environment.
Know PDSE
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dbzTHEdinosauer

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PostPosted: Fri Nov 16, 2007 5:07 pm    Post subject:
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you could read the documentation concerning pdse's. ibm redbooks have three documents I would suggest reading the first.
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ruodeer

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PostPosted: Thu Sep 18, 2008 12:02 pm    Post subject: Reply to: difference between PDS and PDSE
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Here is the Link
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Aaru

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PostPosted: Thu Sep 18, 2008 12:26 pm    Post subject: Reply to: difference between PDS and PDSE
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ruodeer,

Hope you are aware that you had replied to a year old topic.
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vab987

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PostPosted: Wed Sep 24, 2008 6:15 pm    Post subject: Reply to: difference between PDS and PDSE
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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
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