Reapplying updates

iMIS lets you run update (patch) scripts repeatedly, with no ill effects. Why is it designed this way? Because iMIS DB Upgrader must work around differences in how updates are applied at different sites. Since iMIS needs all previous updates to be applied, it's safest for DB Upgrader to reapply the intermediate updates in order, whether needed or not. That way, if you've missed an update or two or even applied an earlier one over a later one, the upgrader will lay down the updates in order to ensure you end up with the proper changes. DB Upgrader can do this since updates can reinstall safely, multiple times. (Overlaying all updates adds almost no time to the upgrade process but greatly improves its robustness.)