Robert A. Rosenberg wrote:
At 08:22 -0500 on 01/08/2011, Bob Rutledge wrote about Re: can I
dynamically increase tso size:
Robert A. Rosenberg wrote:
At 15:13 -0500 on 01/07/2011, Bob Rutledge wrote about Re: can I
dynamically increase tso size:
Krishnan wrote:
Hi All
I am having a similar problem. I am unable to edit a dataset and
instead am getting the 'browse substituted message'
The ISPF edit was attempted for a dataset with following
characteristics
- RECFM=VB, LRECL=5000. - DSORG=PS
- BLOCKSIZE=27998
- It's total size is 31MB and has 1003372 records
TSO regions size is max - 2096128 specified in the login screen
Tried again by choosing the option - Preserve VB record length, but
did not help
ISPF Edit assumes it will need LRECL bytes for each record when it
reads your dataset into memory. Even ignoring overhead (links in
memory), 5000 * 1003372 isn't going to fit.
Bob
That is only true if the RECFM is FB. Since it is VB the 5000 is the
maximum record size only. It does not mean that all the records are
5000 bytes long. Given that the file size is 31MB (32505856) and
there are 1003372 records, the average record size is 33 bytes
including the record length. Given the region size mentioned (which I
assume is in K not bytes) there should be more than enough room for
the file in memory.
Try it.
Or search the archives of ISPF-L where you will find...
"The amount of storage required by the ISPF editor approximates to the
following equation:
(Number of records * (40 + record length))
Note that sites can limit the amount of storage available to ISPF
edit/view
users through the MAXIMUM_STORAGE_ALLOWED_FOR_EDIT setting in the ISPF
configuration table. The default for this setting is 0, which allows edit
to use as much storage as is available.
Regards, Peter
Peter Van Dyke
ISPF"
Bob
That formula seems to assume RECFM=FB. Since the RECFM is VB, the
formula would seem to me to actually be (Number of records*40) +
File-Size. Since the average file size is 33 bytes not 5000 bytes, that
FB formula yields 70MB (which is also what my version yields).
Here's an example, admittedly a pathological one:
- Allocate a dataset RECFM=VB, LRECL=27000
- Populate it with 75,000 5-byte records (one data byte)
You'll end up with a seven-track dataset which is too big for the ISPF editor.
Bob
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