Just as a possible quick tip: Have you disabled DML_LOCKs on the most commonly accessed tables ? Is it possible to do so on at least some of them ?
Under OPS, some activity which is usually local latching activity turns into global lock acquisition. If you have excessive parsing, with dml_locks enabled, this would be one possible reason for excessive waits on the dlm resource hash lists. (This is one of the areas where RAC has introduced a change of strategy that improves performance). Regards Jonathan Lewis http://www.jlcomp.demon.co.uk Coming soon one-day tutorials: Cost Based Optimisation Trouble-shooting and Tuning Indexing Strategies (see http://www.jlcomp.demon.co.uk/tutorial.html ) ____UK_______March 19th ____USA_(FL)_May 2nd Next Seminar dates: (see http://www.jlcomp.demon.co.uk/seminar.html ) ____USA_(CA, TX)_August The Co-operative Oracle Users' FAQ http://www.jlcomp.demon.co.uk/faq/ind_faq.html -----Original Message----- To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]> Date: 13 February 2003 17:57 Hi all: I'm tuning an OPS env. and the things are getting quite deep, DLM latch issues and so on (e.g. lots of waits on "dlm resource hash list"). So I was wondering if any of you know of any site or doc. which could help me on this (OPS tuning specific and very deep information). Of course the first steps in the process was to submit the statspack report to oraperf and so on .... , but right now we are dealing with some issues that surpass the obvious things. So if any you could provide any tip or site to look for a tip I´ll be very glad. thanks in advance -------------------------------- Rui Galamba Marreiros Solution Consultant - HP Services, Consulting & Integration Quinta da Fonte , Edificio D. Sancho I, 2780 Porto Salvo, Portugal Telf: +351 214828500 Fax: +351 21 4838431 [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]> -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: MARREIROS,RUI (HP-Portugal,ex1) 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: Jonathan Lewis 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).
