At 10:55 -0800 on 12/07/2013, Jon Perryman wrote about Re: Something
to Think About - Optimal PDS Blocking:
The JCL manual under RECFM says spanned: VS indicates that the
records are variable length and spanned. VBS indicates that the
records are variable length, blocked, and spanned, and that the
problem program must block and segment the records. Apparently
spanned records is not part of the access method because the manual
says the problem program must block/segment records. As you say,
many of the IBM utilities can handle VBS because they built it in.
Having to do it yourself applies to BSAM/BPAM. If you use QSAM this
is done for you under the covers. IOW: Your input buffer is filled
with a full record when you read and and the record in your buffer is
segmented (if needed) when the output block(s) are created.
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