A320 FMGC nav database

[Superpilot]

Is the nav database on the A320 FMGC customised to company specification with the ability to literally select which airports you'd like in the database? or split by country/region with everyone getting all the performance factored airports available to them within that particular country/region?

I ask because at the last operator I flew with, we constantly experienced missing airports (sometimes even major ones!) in a manner which followed no sensible logic. I.e. lesser airports within a 50 miles radius within the same country were in the database.

Thanks