I know I'm late to the party so this might have been covered. Is this a single session update statement or multiple sessions? I was wondering about ITL waits if multiple sessions - but if it's a single session then I figure ITL waits shouldn't be an issue unless the free space in each block is really, really, low. While you're testing, grab some AWR reports (change your collection interval for 5-10 minutes from default 60 minutes) and check your wait events. (Yes, I know I'm probably preaching to the choir here - but just in case...) Chris -----Original Message----- From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Michael Dinh Sent: Thursday, December 27, 2012 12:51 PM To: rjamya@xxxxxxxxx Cc: oracle-l Subject: Re: OLTP compression slow update Thanks all for the ressponse. Still testing and will share results. -Michael. On Thu, Dec 27, 2012 at 4:52 AM, rjamya <rjamya@xxxxxxxxx> wrote: > I saw this first in early 10g versions of plain vanilla compression > (not fancy oltp etc). We were analyzing http/smtp logs collected > company-wide, Initially we had daily partitions. since it started > getting large quickly (we had open web at that time), I introduced > partition compression, it worked like magic. When updates (due to > occasional re-loads, corrections, ranking etc) to compressed > partitions took long, we redesigned our strategy. Kept 7 days worth of > parttions uncompressed, and everything older was compressed. That > worked out well in the end. I guess the update issue on compressed > data still needs work then :) Raj > > > -- > //www.freelists.org/webpage/oracle-l > > > -- //www.freelists.org/webpage/oracle-l -- //www.freelists.org/webpage/oracle-l