Hi Hans, direct path write cause would be writing temporary segments when sorts are too large to be performed in memory, direct path operations like INSERT /+ APPEND or LOB access. It's hard to guess which one is causing your problems, so I'd suggest you profiling the call having performance issues :
alter session set events = '10046 trace name context forever, level 8'; <do what is an issue> alter session set events = '10046 trace name context off'; Find trace file in udump directory and use tkprof then to identify SQL statement waiting on direct path write. You will need 9i tkprof (any platform is good) to report wait events, otherwise you could review raw trace file . HTH Vadim -----Original Message----- Sent: Tuesday, July 29, 2003 11:54 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 _________________________________________________________________ MSN Zoeken, voor duidelijke zoekresultaten! http://search.msn.nl -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Hans de Git 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: Gorbounov,Vadim 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).
