Depends on how much <twisted logic> you have... Seriously, I would guess that your bottleneck is disk access.
Are you using basic SELECT and READNEXT ? Is your list in sorted order (SSELECT) or not (SELECT). Processing the updates in group order will minimize the I/O. I don't think the READU overhead on today's machines are anything that would slow it down. I just tested 100,000 records with and without locking and I get six seconds both ways. Because it was cached data, my test eliminates disk i/o and measures the lock overhead which seems to be negligible on universe 11.1.1. -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Dave Laansma Sent: Monday, April 30, 2012 5:33 PM To: [email protected] Subject: [U2] READU vs READ If I don't HAVE TO lock a record before modifying it writing it back, will a program run significantly faster if I just WRITE it back without locking it first? I'm updating about 700,000 records and it's just taking TOO long. I DO understand the risks of other users changing the record's content during so let's not go down that road. I'm interested in the SPEED dialog. Thank you folks! Sincerely, David Laansma IT Manager Hubbard Supply Co. Direct: 810-342-7143 Office: 810-234-8681 Fax: 810-234-6142 www.hubbardsupply.com <http://www.hubbardsupply.com> "Delivering Products, Services and Innovative Solutions" _______________________________________________ U2-Users mailing list [email protected] http://listserver.u2ug.org/mailman/listinfo/u2-users _____________________________________________________________________________ Scanned by IBM Email Security Management Services powered by MessageLabs. For more information please visit http://www.ers.ibm.com This email is intended only for the use of the party to which it is addressed and may contain information that is privileged, confidential, or protected by law. If you are not the intended recipient you are hereby notified that any dissemination, copying or distribution of the email or its contents is strictly prohibited. If you have received this message in error, please notify us immediately, by replying to the message and deleting it from your computer. WARNING: Internet communications are not assured to be secure or clear of inaccuracies as information could be intercepted, corrupted, lost, destroyed, arrive late or incomplete, or contain viruses. Therefore, we do not accept responsibility for any errors or omissions that are present in this email, or any attachment, that have arisen as a result of e-mail transmission. _____________________________________________________________________________ _______________________________________________ U2-Users mailing list [email protected] http://listserver.u2ug.org/mailman/listinfo/u2-users
