ACM Computing Surveys (CSUR)
Statistical profile estimation in database systems
ACM Computing Surveys (CSUR)
Linear programming problems and ranking of fuzzy numbers
Fuzzy Sets and Systems
Fuzzy linear regression analysis of fuzzy valued variables
Fuzzy Sets and Systems - Fuzzy information processing
Federated database systems for managing distributed, heterogeneous, and autonomous databases
ACM Computing Surveys (CSUR) - Special issue on heterogeneous databases
The concurrency control problem in multidatabases: characteristics and solutions
SIGMOD '92 Proceedings of the 1992 ACM SIGMOD international conference on Management of data
Federated database management system: requirements, issues and solutions
Computer Communications - Special issue on software aspects of future trends in distributed systems
On global multidatabase query optimization
ACM SIGMOD Record
SIGMOD '93 Proceedings of the 1993 ACM SIGMOD international conference on Management of data
Fuzzy system reliability analysis for components with different membership functions
Fuzzy Sets and Systems
Introduction to part 2: technology for interoperating legacy databases
Modern database systems
Query processing in multidatabase systems
Modern database systems
Adaptive selectivity estimation using query feedback
SIGMOD '94 Proceedings of the 1994 ACM SIGMOD international conference on Management of data
Fuzzy sets and fuzzy logic: theory and applications
Fuzzy sets and fuzzy logic: theory and applications
Fuzzy Multiple Attribute Decision Making: Methods and Applications
Fuzzy Multiple Attribute Decision Making: Methods and Applications
Using Tickets to Enforce the Serializability of Multidatabase Transactions
IEEE Transactions on Knowledge and Data Engineering
A Query Sampling Method of Estimating Local Cost Parameters in a Multidatabase System
Proceedings of the Tenth International Conference on Data Engineering
Query Optimization in a Heterogeneous DBMS
VLDB '92 Proceedings of the 18th International Conference on Very Large Data Bases
Query Optimization in Multidatabase Systems: Solutions and Open Issues
DEXA '99 Proceedings of the 10th International Workshop on Database & Expert Systems Applications
Schema management for large-scale multidatabase systems
Schema management for large-scale multidatabase systems
Distributed and Parallel Databases
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Advances in networking and database technology have made global information sharing a reality. Multidatabase systems (MDBSs) represent a promising approach to addressing the challenges of achieving interoperability among multiple pre-existing databases that are highly autonomous and possibly heterogeneous. The performance of an MDBS is greatly dependent on effectiveness of multidatabase query optimization (MQO). However, the unavailability of and uncertainty in the statistics essential to query optimization have made multidatabase query optimization (MQO) significantly more challenging than distributed query optimization. This research undertook to develop a fuzzy statistics-based MQO approach to addressing statistics estimation and uncertainty problems in an MDBS environment. We analyzed the statistics needed in an MDBS environment and classified them into three categories: point-based, distribution-function-based and dependency-based. Fuzzy numbers were adopted to represent point-based statistics, and a fuzzy polynomial regression method was developed for estimating distribution function-based statistics (i.e., attribute or join selectivity) from a set of subquery results. For dependency-based statistics, a fuzzy regression method was employed for estimating logical-parameter-based local cost functions. Furthermore, methods for ranking the fuzzy numbers that are fundamental to fuzzy-statistics-based MQO were also discussed. The proposed fuzzy statistics estimation methods were illustrated using examples to demonstrate its applicability in supporting MQO.