Contents I Database Management Systems 2

Contents I Database Management Systems 2 II Data Models 3 IIIDatabase Languages 8 IVAdvanced Models and Languages 12 V Distribution 14 VI Conclusions 17 Glossary Application A topic or subject for which information systems are needed, e.g., genomics. Conceptual model A data model that describes application concepts at an abstract level. A conceptual model for an application may be amenable to implementation using dierent database management systems. Concurrency control Mechanisms that ensure that each individual accessing the database can interact with the database as if they are the only user of the database, with guarantees as to the behavior of the system when many users seek to read from or write to the same data item at the same time. Database A collection of data managed by a database management system. Database management system A collection of services that together give comprehensive support to applications requiring storage of large amounts of data that is to be share