[Ethereum] fat db in parity

parity

What does fat_db option in parity do? I don't understand its description from docs:

Build appropriate information to allow enumeration of all accounts and 
storage keys. Doubles the size of the state database.

What kind of information is meant here?
Which RPC requests become available if I run fatdb?

Is "Doubles the size of database" just an estimation or is it always two times bigger?

Thanks

Best Answer

Some rpc calls in parity module would be available:

https://wiki.parity.io/JSONRPC-parity-module

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