Can't remember where this came from but the following events can be safely ignored. Sorry it's just a starter but my understanding of this isn't what it should be.
Iain Nicoll client message SQL*Net message from client SQL*Net more data from client rdbms ipc message pipe get Null event pmon timer smon timer parallel query dequeue -----Original Message----- Sent: 02 October 2001 23:50 To: Multiple recipients of list ORACLE-L Yes, you are right, but my pupils... they WANT TO KNOW THE MEANING... >From: Greg Moore <[EMAIL PROTECTED]> >Reply-To: [EMAIL PROTECTED] >To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]> >Subject: Re: Meaning of V$WAITSTAT statistics >Date: Tue, 02 Oct 2001 14:13:38 -0800 > > > The Oracle 8i Reference manual Appendix A > >While it describes the wait events, it doesn't tell you which ones you can >safely ignore when using waits for tuning. > >Even if you know which ones to focus on, the descriptions are pretty >inadequate. We are informed that a "db file sequential read" means the >session is waiting "while a sequential read from the database is being >performed." On the other hand, a "db file scattered read" is "similar to db >file sequential read, except that a session is reading multiple data >blocks." > >Worse, suppose one of these two waits is twice as significant in my >database >than the other. Does that mean I have a problem and should start using the >wait interface methodologies to track down the SQL that's causing the wait >event to be high? Or is it normal that in a well tuned database that the >one will be higher than the other by a factor of two? Or in fact is it >typical in a well tuned database that the one that appears to be the least >significant should actually be much lower, so I should focus on that? Or >is >there really no such thing as a typical profile for a well tuned database, >because various wait events might be high on your system and low on mine >simply because of the way they're used, so no one really has any idea what >to focus on at any given time? > >-- >Please see the official ORACLE-L FAQ: http://www.orafaq.com >-- >Author: Greg Moore > 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). _________________________________________________________________ Descargue GRATUITAMENTE MSN Explorer en http://explorer.msn.es/intl.asp -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Alejandra Pazos Freire 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: Nicoll, Iain (Calanais) 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).
