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If an inconsistency is found, an error message is returned and all accessed databases remain untouched (atomicity). For the user, this means that updates are only visible '''after''' the end of a snapshot.
It may be surprising to see <code>[[Database Module|db:create]]</code> on bottom in the lower part of this list. This means that newly created database cannot be accessed by the same query, which can be explained by the semantics of updating queries: all expressions can only be evaluated on databases that already exist while compiling and evaluating the queryis evaluated. As a resultconsequence, {{Code|db:create}} is mainly useful in the context of [[Commands#Basics|Command Scripts]], or [[Web Application]]s, in which a redirect to another page can be triggered after having created a database.
====Example====
