The schedule history table fills up rather quickly on our site with 25k + registered users.  We have users online enabled and every minute a record is logged indicating that the purge users job has run successfully.  Is there a way to not log this action?

Hi
Well it actually would log the same number of entries regardless of how many users are on the site. It has to do with the frequency the schedule is running. If you go into the edit screen of each scheduled task there is a retain history setting that can be made. You can and probably should also run "delete from schedulehistory", and "delete from eventlog" in your sql window. That will further clean up those areas. Dont run those if you want to save any of your event log or schedule history though as it will clean it all out. You can further reduce (I think) the number of history items by not running a retry time lapse but you may want to confirm with someone else.
Mike