Less used but still usefull database tasks are grouped in this menu. All actions introduced here requires deep understanding of the Sqlite internals – study its documentation, please.
Raise a dialog to compute the database statistics. You can drop, compute stats for the whole schema, or just select objects.
Raise a dialog to handle free space in the database file.
You can join another Sqlite database file into this session. You'll be able to use new objects in your selects etc. Use schema prefix then.