METU INteroperable DBMS (MIND) is a multidatabase system based on OMG's distributed object management architecture. It is implemented on top of a CORBA compliant ORB, namely, DEC's ObjectBroker. In MIND all local databases are encapsulated in a generic database object. The interface of the generic database object is de ned in CORBA IDL and multiple implementations of this interface, one for each component DBMSs, namely, Oracle7, Sybase, Adabas D and MOOD are provided. MIND provides its users a common data model and a single global query language based on SQL. The main components of MIND are a global query manager, a global transaction manager, a schema integrator, interfaces to supported database systems and a graphical user interface. The integration of export schemas is currently performed by using an object de nition language (ODL) which is based on OMG's interface de nition language. MIND global query optimizer aims at maximizing the parallel execution of the inters...