Hello, Sorry about the screw-up in the subject. It should be "locks". Dreaming about the week-end, I suppose.
Thank you, Paul Sherman DBA Elcom, Inc. voice - 781-501-4143 (direct #) fax - 781-278-8341 (secure) email - [EMAIL PROTECTED] -----Original Message----- Sent: Friday, May 10, 2002 11:34 AM To: Multiple recipients of list ORACLE-L Hello, Has anyone ever tried setting dml_locks to zero or disabling table locks on an OPS (2-node, 8.1.7.2.1, 32-bit; HP 11.0, 64-bit) as a way of reducing contention and freeing up resources ? We currently use 7,250 dml_locks/instance. Oracle's OPS Admin manual (8i) had the following to say: Obtaining table locks, such as DML locks, for inserts, deletes, and updates can diminish performance in Oracle Parallel Server. Locking a table in Oracle Parallel Server is undesirable because all instances holding locks on the table must release those locks. Consider disabling these locks entirely using one of the two methods described under the following headings: Disabling Table Locks Setting DML_LOCKS to Zero We found, of our 200MB shared pool, that 108MB was taken up by State objects, gc_*, and dlm shared memory (100,000 gc_releasable_locks), frequently leaving us with just 3-6MB of shared pool free and getting occasional 4031's, so next week, plan on reducing the granularity considerably by setting gc_files_to_locks as 1=500R:2-600=100REACH, and gc_releasable_locks to roughly 30,000 (doing the math, you get 22,600 for the 1 system datafile and 221 other datafiles; we added 7,400 locks for 74 datafiles future growth). Adding up non-PCM and PCM locks would result in needing 120,123 for lm_ress and 180,185 for lm_locks. Any assistance would be both informative and appreciated. Thank you, Paul Sherman DBA Elcom, Inc. voice - 781-501-4143 (direct #) fax - 781-278-8341 (secure) email - [EMAIL PROTECTED] -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Sherman, Paul R. INET: [EMAIL PROTECTED] Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists -------------------------------------------------------------------- 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.com -- Author: Sherman, Paul R. INET: [EMAIL PROTECTED] Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists -------------------------------------------------------------------- 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).
