</pre>
It may be surprising to see [[Database Module|db:create]] on bottom of this list. This has to do with 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 have been created before running already exist while compiling and evaluating the query.
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.