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Home -> Community -> Mailing Lists -> Oracle-L -> Ant: Re: Cancel of a long-running, latch-holding query takes long (8i) - why?
Thank you, Jared. I haven't thought of that view! But unfortunately it shows only the last db_file_scattered_read event before the cancel operation with rising 'seconds_in_wait'-column value.
In the meanwhile our tar was pointed to bugs about spinning processes when releasing child chain buffer cache latches. But in those cases the only workaround was a db-restart while in our case the cancel operation process just runs long.
Maybe the cancel operation of such a killer query isn't solved too well in 8i.
Peter
Jared Still <jkstill_at_gmail.com> wrote:
querying v$session_wait while waiting might offer up some clues.
Jared
On 6/29/05, Peter Alteheld <palteheld_at_yahoo.de> wrote:Hi List,
we had a cancelled query that held 'cache buffer chain' latches on some objects and took a lot of cpu consumption. The time for the cancel operation takes in our production db (8.1.7) about an hour, on a dev db (8.1.7) 30 min and on an upgraded db (10.1.0.2) only some seconds. While we are not able to upgrade production very soon, I am trying to figure out a solution for 8i.
-- http://www.freelists.org/webpage/oracle-lReceived on Thu Jun 30 2005 - 03:39:25 CDT
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