And a follow-up, if it's not being used, are stats up to date on the table and all indexes? From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Jared Still Sent: Tuesday, July 14, 2009 7:42 PM To: nancy_iles@xxxxxxxxxxx Cc: oracle-l@xxxxxxxxxxxxx; cicciuxdba@xxxxxxxxx Subject: Re: Undo Usage and Read consistency - ORA-1555 On Tue, Jul 14, 2009 at 3:04 PM, Nancy Iles <nancy_iles@xxxxxxxxxxx<mailto:nancy_iles@xxxxxxxxxxx>> wrote: Yes, the there is an index on CONFIRMATION_NO and I have found that _OPTIM_PEEK_USER_BINDS=FALSE on all 6 RAC nodes. So, now on to research the other suggestions! Thanks to everyone for your input. My question was actually slightly different. The index exists, but is it being used? Jared Still Certifiable Oracle DBA and Part Time Perl Evangelist