Sensitive and confidential information is vulnerable to various kinds of misuse when data contained in, or transmitted to / from computer systems they may exposed to passive and / or active threats ....

A multi database consists of a collection of autonomous local databases. Systems used to manage multi databases are called multi database systems (MDBSs). In such a system global transactions are executed under the control of the MDBS. Independently local transactions are submitted directly to a local Database system (LDBS) by local applications....