Update on this - Oracle Support and Dev is SO SLOW and this was a "Priority Handled Service Request"... 11.2.0.2 on RHEL 5.6 x86-64 with ASM Oracle states "The root cause of the problem is LOB index fragmentation". They term this as unfixable bug 13341274: SLOW LOB PERFORMANCE DURING INSERTS. There is no fix other than recreating the segment(s) - CTAS or expdp/impdp (unacceptable). This bug is "hittable" with any mix of DML (including 0) - just doing inserts (no update nor delete) might hit this bug. They suggest moving to Securefiles. I've asked for a previous bug reference or a note regarding this issue, however, I'm still awaiting a response. Anyone have any experience(s) with Securefiles? High concurrency (~100/sec) small (~2KB) LOB insert with Securefiles? How about lower concurrency (~10/sec) larger (~32KB) LOB insert with Securefiles? TIA, Rich On Thu, Oct 27, 2011 at 1:42 PM, Rich <richa03@xxxxxxxxx> wrote: > Thanks for the reply Grzegorz. > > I don't want to do anything which might potentially disrupt the issue > we have right now. > This issue is only on this instance and we cannot repro at will, yet. > So, process level tracing is out of the question currently as that has > potential to crash a process. > Also, this is a production instance (our staging area, so not very > heavy load in any respect), so I have to be somewhat careful. > > We can't switch to SecureFiles without a LOT of testing and I don't > think that's the direction we would/will take anyway. > > For me to be able to post AWR, I'd have to sanitize it which (at this > point) is too much trouble. > > As previously posted, no enqueue issues that I've seen throughout this issue. > > Thanks again, > Rich > > On Thu, Oct 27, 2011 at 10:36 AM, Grzegorz Goryszewski > <grzegorzof@xxxxxxxxxx> wrote: >> Hi, >> is there any chance You can use and share with us output from Tanel's >> ------------------------------------------------------------------------------------ >> -- >> -- File name: oStackProf.sql ( Oradebug short_Stack Profiler ) >> -- Purpose: Take target process stack samples and show an execution >> profile >> -- >> -- Author: Tanel Poder >> -- Copyright: (c) http://www.tanelpoder.com >> -- >> >> from http://files.e2sn.com/scripts/tpt_public_unixmac.tar.gz >> >> during slowness, we can see whats going on on calls level maybe that >> will help . >> Btw is there any chance You can switch to securefiles LOBS ? >> And can You show awr report from that period, maybe there is some HWM >> enqueue issue ? >> Disclaimer: >> Dont blame me for any production issues related to my advice :) >> Regards >> GregG >> >> >> ---------------------------------------------------------------- >> Konkurs: Wygraj nowoczesna suszarke do wlosow! >> Sprawdz >>> http://linkint.pl/f2a72 >> -- >> //www.freelists.org/webpage/oracle-l >> >> >> -- //www.freelists.org/webpage/oracle-l