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Changing the length (LRECL) of an exsting file in Mainframe


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Swetalina

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Joined: 11 Nov 2008
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PostPosted: Wed Nov 12, 2008 3:00 pm
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Hi,

Can we change the record length of an existing file in mainframe? Like suppose the LRECL is 100, can we make it to 300? If yes, how? icon_confused.gif
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enrico-sorichetti

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PostPosted: Wed Nov 12, 2008 3:14 pm
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by using an utility &SORT ( for example )
copy it to a new dataset with the required record lenght and a proper filling...

search the forums for examples

NO, it cannot be done in place
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Swetalina

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PostPosted: Wed Nov 12, 2008 4:26 pm
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OK.That means we can't change LRECL directly. We need to use the copy and sort option. My doubt is solved..Thanks.. icon_smile.gif
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Anuj Dhawan

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PostPosted: Thu Nov 13, 2008 2:29 am
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Hi,

Pardon my ignorance - what is resolved here.. icon_neutral.gif . What does this
Quote:
That means we can't change LRECL directly
mean ? Were you thinking that the information shown under "Data Set Information" (when we use "I" or "S" to get the DSN info on 3.4) is editable or not.. icon_confused.gif
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dick scherrer

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PostPosted: Thu Nov 13, 2008 2:54 am
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Hi Anuj,

Quote:
That means we can't change LRECL directly. We need to use the copy and sort option. My doubt is solved..
It all needs to be read together, not broken apart.

Swetalina confirmed understanding that lrecl of an existing file cannot be edited/changed. To accomplish an lrecl change, the file needs to be re-created (i.e. sort)
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Anuj Dhawan

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PostPosted: Fri Nov 14, 2008 11:01 am
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Hi Dick,

Seems "these stupid meetings" in office are still having their impact on me..

Sorry to bother you Swetalina.

-Ad
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dick scherrer

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PostPosted: Fri Nov 14, 2008 11:21 am
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Quote:
Seems "these stupid meetings" in office are still having their impact on me..
Meetings - the curse of the technical class. . . icon_rolleyes.gif

d
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srvk_2k2

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PostPosted: Fri Nov 14, 2008 2:56 pm
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why can't we use DSRESIZE command from ISPF?
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enrico-sorichetti

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PostPosted: Fri Nov 14, 2008 3:02 pm
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probably because ISPF does not provide such command icon_smile.gif

just to be sure I didn' t skip some ISPF release
could You please post the link to the ispf manuals where the command is described?
thank You

anyway inferring from the name the most You might get from such a command
is to change the allocation parameters, a smarter version of the free unallocated space
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srvk_2k2

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PostPosted: Fri Nov 14, 2008 3:07 pm
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My ISPF version is 5.8 and i'm using this command often.
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enrico-sorichetti

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PostPosted: Fri Nov 14, 2008 3:11 pm
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looks like IBM search engine on the ISPF bookshelf disagrees

Quote:

Search results for shelf: ISPZPM70 "z/OS V1R10.0 ISPF"
0 documents have matches for: DSRESIZE
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Gnanas N

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PostPosted: Fri Nov 14, 2008 3:17 pm
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Hi,

Perhaps, DSRESIZE is in-house option/tool.

We have CHGALLOC to change the allocation parameters.

Code:
                             Change or Allocate                                 
                                                                               
 Type the new value for the desired fields and press Enter.                     
                                                                               
       Old dataset name: 'GNANAS.$FIRST.INFO'                                   
       New dataset name: 'GNANAS.$TEST.INFO'                                   
                                                                               
            Space units: T  B. Blocks        Record format: 6  1. F      5. V   
                            T. Tracks                          2. FB     6. VB 
                            C. Cylinders                       3. FBA    7. VBA
                                                               4. U      8. VBM
       Primary quantity: 1                                                     
     Secondary quantity: 15                  Data blocking: N                   
       Directory blocks:            Blocking record length:                     
             Block size: 32004                                                 
          Record length: 32000                                                 
                                                             --Current Size--   
          Volume serial: DSS047                              Allocated   Used   
            Device type: 3390              # of TRACKS    :    1         1     
           Organization: PS                 Directory blks:                     
          Creation date: 05-30-2008                Extents:    1               
        Expiration date: 0                         Members:               
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srvk_2k2

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PostPosted: Fri Nov 14, 2008 3:18 pm
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It may be avilable as a system extra/special private standards..I'm not sure...
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enrico-sorichetti

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PostPosted: Fri Nov 14, 2008 3:34 pm
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general consideration on

please post only things you are sure about

nobody should expect that a command invoked thru ISPF
is a standard ISPF command,

there are lots of addons to ISPF ( free or fee )
and not all of them are available to everybody,

so the best advice is to post commands available in the base IBM products
in order to avoid any useless back and forth of the type...

Quote:
use this
i tried and i got abend s806
in what library is
it' s in "FOO.BAR"
I do not have, how do I get it
......
37 more useless messages


P.S.
did You notice my signature, before posting I always search, TO BE SURE
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dick scherrer

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Joined: 23 Nov 2006
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PostPosted: Sat Nov 15, 2008 1:30 am
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Hello,

Quote:
My ISPF version is 5.8 and i'm using this command often.
Yes, many site-specific tools are used often (which is why they were created/bought).

Many people who have not worked on multiple computers come to "know" that what they do is what everyone (even elsewhere) can do.

Many of the site-specific tools never mention that they are not part of the standard tso/ispf environment. They are invoked just as though they were "standard".
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