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Shared catalog

 
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ananth86

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Joined: 10 Jun 2009
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Location: Hyderabad

PostPosted: Tue Apr 12, 2011 8:46 pm    Post subject: Shared catalog
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Hi Whenever I see a catalog in a sysplex any system, I am seeing three components of it. I know usually for a catalog we have a catalog component and an Index component.
But I was confused abt the third component, The Listcat of the extra component gives the same result as the catalog component.
Code:

Command - Enter "/" to select action                  Message           Volume
-------------------------------------------------------------------------------
         RDC3CAT                                                        LIBP01
         RDC3CAT                                                        LIBP01
         RDC3CAT.CATINDEX                                               LIBP01
***************************** End of Data Set list ****************************


Any idea or thoughts about it? I am seeing this strange thing only for the catalogs in the sysplex.
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expat

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Joined: 14 Mar 2007
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PostPosted: Tue Apr 12, 2011 9:10 pm    Post subject:
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What do you see when you perform a LISTCAT against the catalog.

Beware - there is a difference between this and a straight LISTCAT, so please reference the IDCAMS manual before doing the LISTCAT operation.
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nevilh

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PostPosted: Wed Apr 13, 2011 1:40 pm    Post subject:
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One can witness this phenomenon on zos systems if the usercatalog is defined to multiple systems and the master catalog from system B is defined as a usercatalog on system A and the MLA is set to greater than 1.
(MLA = Multi Level ALias). It also depends on the search criteria given on the 3.4 panel. To put it simply if the master catalogs from other systems in the sysplex are defined as usercatalogs on the system where you issue the list command, it is possible that all the master catalogs will be searched.
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ananth86

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PostPosted: Thu Apr 14, 2011 9:10 pm    Post subject:
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[quote="nevilh"]One can witness this phenomenon on zos systems if the usercatalog is defined to multiple systems and the master catalog from system B is defined as a usercatalog on system A and the MLA is set to greater than 1.
quote]

Yes you are correct. But I was quite confused with what I saw in 3.4
Code:

Total Tracks:      13694 non-x:      13694 Data Sets:        3 non-x:        3
-------------------------------------------------------------------------------
Command - Enter "/" to select action                  Message           Volume
      Tracks  %     XT Device  Dsorg Recfm Lrecl Blksz  Created    Referred   
          Catalog                                                             
-------------------------------------------------------------------------------
         RDC3CAT                                      LISTC    RC=0     LIBP01
        6825   ?   104 3390     VS   ?         ?     ? 1997/06/08 2011/04/14   
          RDC3CAT                                                             
-------------------------------------------------------------------------------
         RDC3CAT                                      LISTC    RC=0     LIBP01
        6825   ?   104 3390     VS   ?         ?     ? 1997/06/08 2011/04/14   
          SYSMCAT.X21
-------------------------------------------------------------------------------
         RDC3CAT.CATINDEX                                               LIBP01
          44   ?     2 3390     VS   ?         ?     ? 1997/06/08 ***None***   




The issued a Listcat line command for both the instances of "RDC3CAT " I got the same result. Hope that is because the Listcat command pulls the information from the MasterCatalog of the current system.
But the confusion starts here :
If u see the first occurence of "RDC3CAT " shows the In-catalog as "RDC3CAT " itself. why is that so?
Any reference to know MORE about these things in detail?

Thanks in Advance
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expat

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PostPosted: Thu Apr 14, 2011 9:24 pm    Post subject:
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Post the code that you used for the LISTCAT
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Pete Wilson

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PostPosted: Tue May 17, 2011 3:59 pm    Post subject:
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I think it's because Usercatalogs unlike normal VSAM files have a self describing record in their catalog entry
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expat

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PostPosted: Tue May 17, 2011 4:06 pm    Post subject:
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Pete, that was the point I was trying to get the OP to realise
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