On Mon, 2 Mar 2009 17:28:55 -0600, David Speake wrote: >I have a customer with what they perceive as a memory problem, Reviewing >their JCL I feel otherwise. There are some VSAM BLSR values that I >seriously question. I have written a response but am now having insecurity >issues - its been a while and although "VSAM Demystified" and "DFSMS Using >Data Sets" seem to confirm most of my material, I'd sure like to see a z/OS >R1.9 VSAM PLM for a few hours. > >I have my beach towel handy in case the egg on my face get real deep. >Comments and pointers appreciated. > >Cut/Paste > > 90 XXH99NMODF DD SUBSYS=('BLSR','DDNAME=BLSRMODF', *MOD FILE * > XX 'BUFSI=4096,BUFSD=8192', > CISIZES --------------1536 ------4096 > DATA CI/CA----------------180 > KEYLEN---------------------14 > XX 'BUFNI=7972,BUFND=272', > XX 'RMODE31=ALL','MSG=I', > XX 'SHRPOOL=01') > 91 XXBLSRMODF DD DSN=&V1..HBBMA.YW&PL.MODS, * MODIFIER FILE * > XX DISP=(SHR,KEEP,KEEP) > IEFC653I SUBSTITUTION JCL - dsn=tm2v....@.hbbma.yw88mods,DISP=( > 92 XXH99NPFLG DD SUBSYS=('BLSR','DDNAME=BLSRPFLG', *PFLG FILE * > XX 'BUFSI=4096,BUFSD=8192', > CISIZES --------------1536 ------4096 > DATA CI/CA----------------180 > KEYLEN-----------------8 > XX 'BUFNI=4070,BUFND=532', > XX 'RMODE31=ALL','MSG=I', > XX 'SHRPOOL=01') > 93 XXBLSRPFLG DD DSN=&V1..HBBMA.MW&PL.PFLG&NODE, *PROC STUB FILE* > XX DISP=(SHR,KEEP,KEEP) > IEFC653I SUBSTITUTION JCL - dsn=tm2v....@.hbbma.mw88pflg,
I assume you're perceiving a performance problem with this. Personally, I wouldn't specify BUFSI, BUFSD, BUFNI nor BUFND. Let BLSR figure it out for itself. It is my experience that a micromanaged specification is obsoleted soon after it's made. But if you must, use BUFNI and BUFND only. I limit my interference with BLSR to one specification; DEFERW=YES ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html