Lizzette, I just checked some parms from my last shop that was a very large DB2 shop, 6 LPARS and we had USEZOSV1R9RULES( NO) set BMC - CONTROL-X product suite - no issues at all . hth's some
Carmen ----- Original Message ----- From: "Lizette Koehler" <stars...@mindspring.com> To: IBM-MAIN@LISTSERV.UA.EDU Sent: Friday, October 27, 2017 10:36:02 AM Subject: Question on some z/OS Tuning Parms USEZOSV1R9RULES and MEMDSENQMGT Dear List - I have been reviewing some parms that have been around in z/OS for a few years/decades? USEZOSV1R9RULES VSM USEZOSV1R9RULES(NO|YES): YES causes GETMAIN and STORAGE OBTAIN behavior to be unchanged from its historic behavior. NO causes GETMAIN and STORAGE OBTAIN behavior for user-region private area subpools that are both below and above the line to be implemented. Thus DQEs can be merged where possible. The default is YES to provide a seamless migration. However, IBM recommends that you specify USEZOSV1R9RULES(NO) to obtain a performance benefit for applications with long DQE/FQE chains for user-region private area subpools. To Display: D DIAG MEMDSENQMGT Allocation enhancement - MEMDSENQMGMT (Memory-based data set ENQ management) - ENQs managed in private storage instead of SWA blocks. Job will be non-restartable. - Enable via parmlib member or MVS command: . ALLOCxx: SYSTEM MEMDSENQMGMT(ENABLE) . SETALLOC SYSTEM,MEMDSENQMGMT=ENABLE - Exploit with DB2 APAR PM17542 (closed September 2010) To display: D ALLOC,OPTIONS I was wondering two things 1) How many are using the new algorithms these two parms brought in? 2) When you changed to the new functions, did you see any issues? Any products that need TLC? Are there any other that might also be helpful? Thank you Lizette Koehler statistics: A precise and logical method for stating a half-truth inaccurately ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
