Hi all, We have a highly used randomly accessed read-only VSAM KSDS that is managed by Hiperbatch during the Production batch window. Unfortunately, some of the jobs that use it are still seeing unacceptably high I/O counts and long elapsed times.
I have been asked to improve the performance of these jobs in my application area. I think I need to determine if Hiperbatch is still the best way for our programs to access this file, or whether BLSR or the newer SMB buffering will produce better results overall. Many tens, perhaps hundreds, of jobs probably access this file over the course of the batch window. My experience so far is that I can get proveably better performance than Production gets from an individual job by using BLSR or SMB in place of Hiperbatch, but I have no handle on how exchanging one central memory repository (Hiperbatch) for tens or hundreds of jobs buffering the file themselves will affect overall system performance and thus the performance of all the jobs that use the file. I also haven't got test access to Hiperbatch (yet), so it's kind of hard to run comparison tests myself at the moment. That may change, but it will take a while before I can think about having that access. Is there a way for an individual job to "opt out" of letting Hiperbatch manage a particular file? Without stopping other jobs from continuing to use it? Advice, pointers to redbooks or whitepapers, any help at all gratefully accepted. Peter P.S. -- I do NOT have access to SMF records, I do NOT have access to DCOLLECT, nor any other real performance measurement tools. I'm just the programmer trying to improve the job's performance based on what I see in the JESMSGLG and JESYSMSG outputs. This message and any attachments are intended only for the use of the addressee and may contain information that is privileged and confidential. If the reader of the message is not the intended recipient or an authorized representative of the intended recipient, you are hereby notified that any dissemination of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by e-mail and delete the message and any attachments from your system. ---------------------------------------------------------------------- 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
