Database is derived from Data. Data is related to Information. Information is a type of Knowledge. Knowledge is related to Brain. 
Gravity is related to Nature. you are likely to find System in/at/on Nature. 
Database --DerivedFrom--> Data <--RelatedTo--> Information --IsA--> Knowledge <--RelatedTo--> Brain 
Gravity <--RelatedTo--> Nature <--AtLocation-- System 