two instance -- one database

I have a friend (no really, this isn't some lame way of telling you about me but trying to hide that by ... )

I have a friend, and at his company they have an Oracle database with tables and data. We'll call it Database A and they have another Database B that has views across dblinks to each of the tables in Database A. The data team says that this protects Database A from bad queries.

So can anyone think of any possible benefit from this arrangement? Will administration be easier, queries faster, performance more predictable? Anything?

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