Correctness criteria and concurrency control
Panos K. Chrysanthis, Krithi Ramamritham · 1998
Introduction Database systems have been widely incorporated in almost all aspects of the operations of large organizations. Database systems offer reliability guarantees concerning the correctness of data in spite of failures and concurrent accesses by multiple users. Similar guarantees are expected from multidatabase systems (MDBS) which logically integrate multiple pre-existing database systems providing uniform and transparent access to data stored in these databases. MDBSs respond to the needs of organizations to interoperate their databases already in service supporting new global applications that access multiple databases. An MDBS allows each local database system to continue to operate in an independent fashion. That is, an MDBS preserves the autonomy of the local database systems, meaning that the MDBS design does not require any changes to existing databases and applications, or to the local database management systems. Further, they