E. Radeke and M. H. Scholl. Framework for Object Migration in Federated Database Systems. In Proc. 3rd Int. Conf. on Parallel and Distributed Database Systems (PDIS'94), IEEE Computer Science Press, 1994.  Home/Search   Document Details and Download   Summary   Related Articles   Check

....systems. The aim is to obtain a federated database system in the sense of [SL90] Besides a uniform access to data stored in different database systems, migration of applications and data from one database system to another one is an additional motivation for building federated database systems [RS94]. The integration of heterogeneous databases is a well known problem. A large number of approaches for integrating the local schemata of such databases have been proposed up to now, e.g. SPD92, BFN94, RPRG94, GCS95] Unfortunately, most approaches do not take integrity constraints into ....

E. Radeke and M. H. Scholl. Framework for Object Migration in Federated Database Systems. In Proc. 3rd Int. Conf. on Parallel and Distributed Database Systems (PDIS'94), IEEE Computer Science Press, 1994.

....objects) which become the image of relational data stored in the root base. This is an advantage over a strict migration approach. 5 Related Work Several projects and approaches address the problem of database integration [39, 17, 24] which is closely related to that of database migration [11, 33]. Views are used in many of function body Evaluate Query For CONF EVENT:unique set(tuple(conf id:integer) f o2 unique set(tuple(conf id:integer) aux; context associate( select conf id from conference ) context define projection(aux,list( conf id ) context exec; context fetch(0) ....

E. Radeke and M. Scholl. Framework for Object Migration in Federated Database Systems. In Proc. Int'l Conf. on Parallel and Distributed Information Systems, Austin, Texas, September 1994.

....checking (without interest) the object representing the account stops playing the role of INTEREST CHECKING and starts a new role of REGULAR CHECKING. Recently, the notion of object migrations is emerging as an important functionality that should be supported by objectoriented database systems [1,17,19,22,23,29,30]. We use a simple semantic data model which includes object identifiers (OIDs) classes, inheritance hierarchies, and attributes ranging over printable values. The model can be viewed as a proper subset of many semantic models such as IFO, SDM, TAXIS, GSM (see [23] etc. In a class hierarchy, an ....

....objects to change class memberships during their life span. Such novel operations are unique for object oriented databases and application examples naturally justifies the need to support object migration. Indeed, implementation techniques have been considered for object oriented database systems [17,19,22,29,30]. In a class hierarchy, an object may belong simultaneously to a set of classes, called the role set of the object; it may also be migrated to a different role set later on. Under a fixed transaction schema, an object may pass through a sequence of role sets during its life span. Such a ....

E. Radeke and M. H. Scholl, Framework for object migration in federated database systems, in: Proceedings of the Third International Conference on Parallel and Distributed Information Systems, Los Alamitos, CA, (IEEE Comput. Soc. Press, Silver Spring, MD, 1994) 187--194.

....interface of the FDBS and is called object migration because we use a canonical object oriented data model. By object migration, objects can be migrated among arbitrary component database systems. The functionality for object migration in FDBS is based on the migration framework we developed in [13]. We summarize briefly its concepts in this section before deriving the migration functionality. Important characteristic is that compatibility to existing applications which access the global external interface of the FDBS is preserved, a change of data locality by migration will be transparent ....

RADEKE, E., SCHOLL, M.H. Framework for object migration in federated database systems. In Proc. Int'l Conf. on Parallel and Distributed Database Systems (Austin, USA), 1994.

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