I've got a SQL 2005 database which has some maintenance plans on it set up by someone else. One runs Update Statistics on all databases early in the morning. It seems this is causing tempdb to fill up and hence breaking some other maintenance tasks which are running at the time. It's not successfully run for at least a week now. I've got Auto Update Statistics set to true though, so do I even need to be running Update Statistics every morning? There are other maintenance plans including a nightly reindex job, I don't know if having that then requires that the statistics are updated.