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Why DB2 is supporting only LDS and not any other


IBM Mainframe Forums -> DB2
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usha.ushaa

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Joined: 12 Dec 2006
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Location: Trivandrum

PostPosted: Mon Jun 04, 2007 4:00 pm
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Can anyone explain why DB2 is supporting only LDS and not any other
VSAM datasets.
Thanks in Advance,
Usha
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usha.ushaa

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Joined: 12 Dec 2006
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PostPosted: Mon Jun 04, 2007 4:03 pm
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Actually tablespace is an LDS and an index is also an LDS . How these
two are correlated(for eg: if I delete a table the index is also deleted)
how this happens?
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dick scherrer

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Joined: 23 Nov 2006
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Location: Inside the Matrix

PostPosted: Mon Jun 04, 2007 10:18 pm
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Hello,

What you are asking about is the IBM design of DB2. These are not something dba/programmer/etc people have any control over.

There is no good reason for these - it is just they way db2 was implemented.

DB2 is designed to only work on "tables" and the other types ov files are not db2 tables. . .

If this is not what you wanted, please let us know.
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Craq Giegerich

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Joined: 19 May 2007
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PostPosted: Mon Jun 04, 2007 11:43 pm
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If you don't like the way DB2 operates you can always write your own version.
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pavchau1

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Joined: 05 Jul 2019
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PostPosted: Wed Jul 17, 2019 10:39 pm
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Hi Dick Scherrer,

Yeah I understand Db2 is designed in such way so it uses only LDS, but back in old days, Db2 used ESDS and now LDS is standard, so my question is what is the reason so Db2 switched to LDS from ESDS. LDS has any benefit over ESDS or something else?


Thanks,
Pavan Chauhan
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dneufarth

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Joined: 27 Apr 2005
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Location: Inside the SPEW (Southwest Ohio, USA)

PostPosted: Wed Jul 17, 2019 11:15 pm
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I believe Mr Scherrer passed away.
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pavchau1

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PostPosted: Wed Jul 17, 2019 11:38 pm
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i am sorry
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pavchau1

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PostPosted: Wed Jul 17, 2019 11:39 pm
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anyone else can answer my question?
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Robert Sample

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Joined: 06 Jun 2008
Posts: 8700
Location: Dubuque, Iowa, USA

PostPosted: Wed Jul 17, 2019 11:42 pm
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Yes, Mr. Scherrer passed away about 5 years ago.

IBM does not provide any rationales for why they do things, but I would guess the byte-oriented nature of LDS and its lack of record structure compared to ESDS may have something to do with why they switched. However, unless you work for IBM's DB2 group it is EXTREMELY unlikely that you will ever find out the precise reasons for the change.
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Rohit Umarjikar

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Joined: 21 Sep 2010
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PostPosted: Thu Jul 18, 2019 5:58 pm
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Pavan, Btw it’s DB2 and not Db2 unless yours belongs to IbM.

www.redbooks.ibm.com/redpapers/pdfs/redp4187.pdf
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John Poulakos

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Joined: 13 Jun 2012
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Location: United States

PostPosted: Thu Jul 18, 2019 9:47 pm
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ESDS datasets are extremely unstable and don't follow standards dictated by the Access Control Block architecture.
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vasanthz

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Joined: 28 Aug 2007
Posts: 1744
Location: Tirupur, India

PostPosted: Fri Jul 19, 2019 1:41 am
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Quote:
Pavan, Btw it’s DB2 and not Db2 unless yours belongs to IbM.


It is Db2 not DB2 anymore. IBM rebranded a lot of stuff - www-01.ibm.com/common/ssi/ShowDoc.wss?docURL=/common/ssi/rep_ca/7/899/ENUSLP18-0047/index.html&request_locale=en

Db2 is correct.
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Rohit Umarjikar

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Joined: 21 Sep 2010
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PostPosted: Sat Jul 20, 2019 4:13 am
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No more old school philosophy, that’s great to know thanks
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