Re: VSAM Question

Thread View: comp.lang.asm370

1 messages

[T] Back to Threads [V] Tree View [G] Group Articles

1 total messages Started by Dave Andrews Wed, 30 Sep 1992 15:00

#522

Author: Dave Andrews
Date: Wed, 30 Sep 1992 15:00

32 lines
1950 bytes

In article <9209291218.AA25935@nettlerash.berkeley.edu> IBM 370 Assembly
 Programming Discussion List <ASM370%UGA.BITNET@cmsa.Berkeley.EDU> writes:
>Hello All,
>   We have MVS/ESA 4.2 and Assembler H v2.0.
> I'm trying to read a VSAM user catalog and then extract the
>cluster names and put them on a separate file, same as IDCAMS
>LISTCAT command then after that I want to check if the cluster
>names is a KSDS or ESDS structure if so I want to check CI and
>number of extent for that cluster, I've used the SHOWCAT and SHOWCB
>Macros but with out any sucesseded .

Assuming that your VSAM user catalog is ICF, it is possible for you
to open the user catalog directly as a KSDS and read the cluster
record yourself.  This has a tremendous speed advantage over having
to post-process IDCAMS listings.

Unfortunately, the DFP documentation these days neglects to point out
that you can do this.  Also, IBM has ceased distributing the record
layouts for ICF catalogs.  If you have access to older (DFP1) catalog
PLMs then you can find the descriptions of the records.

At SHARE, IBM is none-too-subtly discouraging us from directly reading
ICF catalogs, but they haven't given us any alternative yet.

If this interests you, contact me and I'll tell you what I can.

- David Andrews
  A. Duda and Sons, Inc.
  1975 W. Broadway
  Oviedo, FL  USA
  407-365-2153
  dandrews@bilver.oau.org

Thread Navigation

This is a paginated view of messages in the thread with full content displayed inline.

Messages are displayed in chronological order, with the original post highlighted in green.

Use pagination controls to navigate through all messages in large threads.

Back to All Threads