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.
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