But, I would like to know how this seemingly high wait for 'direct path write' is affecting the overall response time. (ResponseTime = WaitTime + ServiceTime)
If the 'CPU used by this session' is not considered in light of these wait times, aren't you getting ready to bark at the wrong tree? - Kirti --- John Kanagaraj <[EMAIL PROTECTED]> wrote: > Hans, > > Now let me guess.... Your disks are all RAID 5, right? And you possibly are > bottlenecking on CPU as well? It is clear from the Top 5 that writes are an > issue across the board, to TEMP (direct path write), Redo (log file sync) > and DB files (db file parallel writes). Creating a RAID 1 set of disks and > moving at least the TEMP, RBS, Redo (and Arch if present) to this will > definitely help. > > John Kanagaraj > Phone: 408-970-7002 (W) > Fax: 408 327 3086 (Call/Email prior to fax) > > > -----Original Message----- > Sent: Tuesday, July 29, 2003 8:54 AM > To: Multiple recipients of list ORACLE-L > > > Hi All, > > Please help me tune this i/o related wait event. This is my 8.1.6 statspack > top-5 wait list: > Top 5 Wait Events > ~~~~~~~~~~~~~~~~~ Wait % > Total > Event Waits Time (cs) Wt > Time > -------------------------------------------- ------------ ------------ > ------- > direct path write 304,867 35,925 > 49.83 > log file sync 145,015 23,441 > 32.52 > db file sequential read 11,370 3,684 > 5.11 > file open 981 3,326 > 4.61 > db file parallel write 1,893 3,115 > 4.32 > > You'll notice that 'direct path write' is the most expensive one in the > list. I cannot find enough info on the net about this wait event, therefore > I'm asking the real experts. > > What events in Oracle trigger this wait event? In what way is this event > different from "db file parallel write"? > I mostly read comments that suggest lots of sorting and parallallel queries. > > However, most sorts are done in memory and degree = 0 for all tables. > > Any suggestions are very welcome. > > Thanks, > Hans de Git > > __________________________________ Do you Yahoo!? Yahoo! SiteBuilder - Free, easy-to-use web site design software http://sitebuilder.yahoo.com -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Kirtikumar Deshpande 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).
