nuno-- what level are you trying to scale it to? how long will you hold the locks? I used it last year because only one process could run at a time.
seemed to have similiar over head to 'select for update'. If you look at the PL/SQL Packages book by Fuerstein et al(not a real popular book, but I like it)... there is a nifty wrapper for DBMS_LOCK. I based my code off of that. > > From: "Carel-Jan Engel" <[EMAIL PROTECTED]> > Date: 2004/01/21 Wed AM 08:24:25 EST > To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]> > Subject: Re: Has anyone done any scalability work on dbms_lock? > > > As in: does it present an inherent or hidden performance > > problem when a lot of sessions try to lock/release the same > > lock? > Will serialize perfectly! > > > Or how many lock/release per second. Or some other > > idea of how efficient it is? > Depends on the work done between acquiring the lock and releasing it. > > > > > Need to use it in a design, but not sure of any potential > > performance hits or scalability issues. Any ideas? > When sessions acquire the same lock (as asked), only one session can do > the work in a given moment. So, it doesn't scale. There will be overhead, > but that also is relative to the duration of the work done while the lock > is held. > > Maybe AQ can help, by doing the work asynchronously in the background and > so lift the serialization from the primary proces(ses)? > > > Regards, Carel-Jan > > === > If you think education is expensive, try ignorance. (Derek Bok) > === > > > > > TIA. > > Cheers > > Nuno Souto > > [EMAIL PROTECTED] > > -- > > Please see the official ORACLE-L FAQ: http://www.orafaq.net > > -- > > Author: Nuno Souto > > INET: [EMAIL PROTECTED] > > > > Fat City Network Services -- 858-538-5051 http://www.fatcity.com > > San Diego, California -- Mailing list and web hosting services > > --------------------------------------------------------------------- > > To REMOVE yourself from this mailing list, send an E-Mail message > > to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in > > the message BODY, include a line containing: UNSUB ORACLE-L > > (or the name of mailing list you want to be removed from). You may > > also send the HELP command for other information (like subscribing). > > > > > > > -- > Please see the official ORACLE-L FAQ: http://www.orafaq.net > -- > Author: Carel-Jan Engel > INET: [EMAIL PROTECTED] > > Fat City Network Services -- 858-538-5051 http://www.fatcity.com > San Diego, California -- Mailing list and web hosting services > --------------------------------------------------------------------- > To REMOVE yourself from this mailing list, send an E-Mail message > to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in > the message BODY, include a line containing: UNSUB ORACLE-L > (or the name of mailing list you want to be removed from). You may > also send the HELP command for other information (like subscribing). > -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: <[EMAIL PROTECTED] INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
