All of the discussions recently about the impact of BUFNO and the Benchmarks that Chuck Hopf and I have conducted have been for the QSAM Access Method, which does have a default of 5 buffers and a fixed upper limit of BUFNO=30, (and, for larger blocksizes, you won't even get that many with QSAM).
We have not repeated those experiments with BSAM, but we know that there is no similar limit to BUFNO with BSAM, and we found years ago, that for files with small records, like the online TMC/CA1- Catalog dataset, read with BSAM can benefit from large BUFNO. Specifically, this nearly 10-year old Change noted: Change 13.308 Setting BUFNO=220 on the //TMC DD statement can make a TYPETMS5 dramatic reduction in elapsed time. A fifteen-minute run Jan 8, 1996 ran in under 4 minutes with increased buffers. Thanks to Freddie Arie, Lone Star Gas, TEXAS. because the //TMC DD was read with a SAS Infile Statement, and SAS uses the BSAM Access Method to read and INFILEs (and BSAM to write to FILE statements) under z/OS. So the answer, as usual, is, it all depends. Barry Merrill ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
