I wish now that I hadn't deleted what I composed this morning... It was this:
People probably get sick of seeing me say the same thing over and over and over... You have some interesting information from the truss that you've done. But you can't tell how long something took by counting how many times it happened. The easiest way to determine what's consuming the most *time* is to use extended SQL trace (event 10046 level 8). The resulting trace file will tell you exactly where your time has gone, and it will enable you to determine whether your performance problem is a result of the kaio calls or not. You'll probably find that the system is doing what you suspect: issuing an async write call, failing, and then calling a synchronous write call. However, without knowing the impact of this behavior upon response time, it's hard to know whether the time you invest into "checking" stuff and "fixing" stuff is worth anything. The worst feeling is to invest your time into fixing something, succeeding, and then finding you've made no impact because the thing you fixed accounts for only a small amount of response time. ...Find out what activity is consuming the largest chunk of your response time, and then try to figure out how to do that thing less. The cheapest, fastest, most error-free way that I know to do that is to collect the 10046 level-8 data. Cary Millsap Hotsos Enterprises, Ltd. http://www.hotsos.com Upcoming events: - RMOUG Training Days 2003, Mar 5-6 Denver - Hotsos Clinic 101, Mar 25-27 London -----Original Message----- [EMAIL PROTECTED] Sent: Tuesday, February 25, 2003 2:45 PM To: Multiple recipients of list ORACLE-L I did this and its taking the same amount of time. The difference this time is that it does not do the KAIO call. But the time has not improved. Its still doing pwrite calls. TIA Babu John Kanagaraj <[EMAIL PROTECTED] To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]> ds.com> cc: Sent by: Subject: RE: performance issues on sun [EMAIL PROTECTED] 02/25/03 01:04 PM Please respond to ORACLE-L Babu, > I think it is trying to do a KAIO call and failing. Then it attempts a > synchronous PWRITE call. > > But our SAs are not able to help us to confirm this. Have any > of you seen > this issue? I think you have hit the nail on the head. By default, the Oracle port on Solaris sets 'disk_async_io' to TRUE. Set this to FALSE by introducing such an entry in init.ora. Let us know if tihis solves your issue... John Kanagaraj Oracle Applications DBA DBSoft Inc (W): 408-970-7002 I don't know what the future holds for me, but I do know who holds my future! ** The opinions and statements above are entirely my own and not those of my employer or clients ** -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: John Kanagaraj 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). 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If you received this communication in error, please notify the sender immediately by replying to this message and delete it from your computer. -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: 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: Cary Millsap 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).
