A method of operating a data exchange includes creating a first listing referencing data of a first database of a plurality of databases, wherein the first listing comprises access controls and a data share associated with a first user, the access controls defining portions of the first database that are accessible by a second user, receiving a request from the second user for a bidirectional share between the portions of the first database that are accessible by the second user and portions of a second database controlled by the second user, and receiving an instruction from the first user to perform a database operation referencing data of the bidirectional share between the portions of the first database that are accessible by the second user and the portions of the second database controlled by the second user.