-This unique approach to understanding and applying changes is what enables SQLMesh's virtual data mart technology. This technology allows SQLMesh to ensure complete isolation between environments while allowing it to share physical data assets between environments when appropriate and safe to do so. Additionally, since each model change is captured in a separate physical table, reverting to a previous version becomes a simple and quick operation (refer to [Virtual Update](#virtual-update)) as long as its physical table hasn't been garbage collected by the janitor process. SQLMesh makes it easy to be correct, and really hard to accidentally and irreversibly break things.
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