Results 1 - 10 of 66

Retrieving And Integrating Datafrom Multiple Information Sources

by Yigal Arens , Chin Y. Chee, Chun-Nan Hsu, Craig A. Knoblock , 1993
"... With the current explosion of data, retrieving and integrating information from various sources is a critical problem. Work in multidatabase systems has begun to address this problem, but it has primarily focused on methods for communicating between databases and requires significant effort for e ..."
Abstract - Cited by 332 (31 self) - Add to MetaCart
With the current explosion of data, retrieving and integrating information from various sources is a critical problem. Work in multidatabase systems has begun to address this problem, but it has primarily focused on methods for communicating between databases and requires significant effort

An Extended SQL for Fuzzy Multidatabases

by Awadhesh Kumar Sharma, A. Goswami, D. K. Gupta
"... Many real world problems involve imprecise and ambiguous information rather than crisp information. Recent trends in the database paradigm are to incorporate fuzzy sets to tackle imprecise and ambiguous information of real world problems. Fuzzy query processing in multidatabases have been extensivel ..."
Abstract - Add to MetaCart
Many real world problems involve imprecise and ambiguous information rather than crisp information. Recent trends in the database paradigm are to incorporate fuzzy sets to tackle imprecise and ambiguous information of real world problems. Fuzzy query processing in multidatabases have been

A distributed rule mechanism for multidatabase systems. Springer-Verlag LNCS

by Vasiliki Kantere, John Mylopoulos, Iluju Kiringa , 2003
"... Abstract. We describe a mechanism based on distributed Event-Condition-Action (ECA) rules that supports data coordination in a multidatabase setting. The proposed mechanism includes an ECA rule language and a rule execution engine that transforms and partitions rules when they are first posted, and ..."
Abstract - Cited by 4 (1 self) - Add to MetaCart
Abstract. We describe a mechanism based on distributed Event-Condition-Action (ECA) rules that supports data coordination in a multidatabase setting. The proposed mechanism includes an ECA rule language and a rule execution engine that transforms and partitions rules when they are first posted

Exploiting Transaction Semantics in Multidatabase Systems

by Rajeev Rastogi, Henry F. Korth, Avi Silberschatz - IN PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON DISTRIBUTED COMPUTING SYSTEMS , 1992
"... Serializability is the traditionally accepted notion of correctness in most database systems. However, in a multidatabase system (MDBS) environment consisting of pre-existing and autonomous database systems, requiring schedules to be serializable could severely hurt performance. Besides, in a num ..."
Abstract - Cited by 9 (2 self) - Add to MetaCart
Serializability is the traditionally accepted notion of correctness in most database systems. However, in a multidatabase system (MDBS) environment consisting of pre-existing and autonomous database systems, requiring schedules to be serializable could severely hurt performance. Besides, in a

An Algebra and Calculus for Multidatabases with Integrity Constraints

by Kasim Candan Subrahmanian, Kasim S. C, V. S. Subrahmanian
"... Litwin et. al. have developed a language called MSQL for query multidatabases. Subsequently, Grant, Litwin, Roussopolous and Sellis have developed a calculus and algebra associated with MSQL that facilitates querying and interoperation in a multidatabase environment. In this paper, we build upon ..."
Abstract - Add to MetaCart
their framework by assuming that a set of integrity constraints must be satisfied. Even though each individual database in a multidatabase may satisfy the integrity constraints, the entire multidatabase itself may not satisfy the constraints. We propose three new data retrieval notions based on whether

An Algebra and Calculus for Multidatabases with Integrity Constraints

by Kasim S. Candan, V. S. Subrahmanian
"... Litwin et. al. have developed a language called MSQL for query multidatabases. Subsequently, Grant, Litwin, Roussopolous and Sellis have developed a calculus and algebra associated with MSQL that facilitates querying and interoperation in a multidatabase environment. In this paper, we build upon the ..."
Abstract - Add to MetaCart
their framework by assuming that a set of integrity constraints must be satisfied. Even though each individual database in a multidatabase may satisfy the integrity constraints, the entire multidatabase itself may not satisfy the constraints. We propose three new data retrieval notions based on whether

Resolving Inconsistencies in the Multiplex Multidatabase System

by Philipp Anokhin, Amihai Motro , 1999
"... With the development of the Internet and the on-line availability of large numbers of information sources, the problem of integrating multiple heterogeneous information sources requires reexamination, its basic underlying assumptions having changed drastically. Integration methodologies must now ..."
Abstract - Add to MetaCart
contend with situations in which the number of potential data sources is very large, and the set of sources changes continuously. In addition, the ability to create quick, ad-hoc virtual databases for short-lived applications is now considered attractive. Under these new assumptions, a single, complete

Conflict Resolution and Reconciliation in Multidatabase Systems

by Shi-ming Huang, Ming-yi Chen, Irene Kwan - International Journal of Information and Management Sciences , 2000
"... Systems A multidatabase system is built upon a number of existing database systems. It requires an interface to allow users to access global heterogeneous information within a reconciled platform as well as to maintain the data consistence and integrity among existing database systems. As a result, ..."
Abstract - Cited by 1 (1 self) - Add to MetaCart
Systems A multidatabase system is built upon a number of existing database systems. It requires an interface to allow users to access global heterogeneous information within a reconciled platform as well as to maintain the data consistence and integrity among existing database systems. As a result

Entity Join Optimization in Multidatabase Systems

by Pauray S. M. Tsai, Arbee L. P. Chen
"... Heterogeneities exist in a multidatabase environment. For example, a real world entity may be di erently represented in relations of di erent databases. In particular, keys of these relations may be incompatible. In this paper, we develop an entity join operator named EJ operator, which can be used ..."
Abstract - Add to MetaCart
uncertainty onthe join attributes. The EJ operator, NJ operator and the previously proposed extended relational operators can be combined to support a more powerful set of operations for a multidatabase system. We consider processing entity join queries in a wide area multidatabase environment where the query

Using Heterogeneous Equivalences for Query Rewriting in Multidatabase Systems

by Daniela Florescu, Louiqa Raschid, Patrick Valduriez , 1995
"... In order to have significant practical impact on future information systems, multidatabase management systems (MDBMS) must be both flexible and efficient. We consider a MDBMS with a common object-oriented model, based on the ODMG standard, and local databases that may be relational or object-oriente ..."
Abstract - Cited by 29 (4 self) - Add to MetaCart
-oriented. In this context, query rewriting (for optimization) is made difficult by schematic discrepancy, and the need to model mapping information between the multidatabase and local schemas. We address the flexibility issue by representing the mappings from a local schema to the multidatabase schema, as a set
Results 1 - 10 of 66