I think its important to know what we mean by a "database" in this context.
In this context what is required is a comprehensive properly constructed electronic relational database that is maintained, searchable and up to date.
Attempting to overlay a "database" on old manual, fragmented ad hoc (often manual) systems is doomed to (abject) failure ( just look at ppars etc).
The Book of Kells is fine database but it is not maintained, searchable and up to date!
Im not a database designer but I do understand the importance of well designed planned and defined electronic systems to refelect reality in real time.
Proper data-entity relationship models need to be developed in which terms (and the relationship between them) need to be defined (owner, property, name address, household, unique identifier, geographic location, valuation, occupier etc)