Is your alert log any help? Is anyone issuing "alter system switch logfile" ? Possibly someone botched a cron issuing that before backups? This is all wild guessing, but if you haven't changed anything in Oracle on purpose, we're left with changes outside of Oracle, right? Good luck. Sure seems mysterious to me. _____ From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Weatherman, John Sent: Wednesday, February 20, 2008 5:33 PM To: Roman Podshivalov Cc: oracle-l@xxxxxxxxxxxxx Subject: RE: Rapid Log Switching archive_lag_target is 0. Nothing else is strange or has changed for months..I've been trying to make changes and can't get approval! <snip>