Now showing items 1-10 of 13
On Cost-effectiveness of a Semijoin in Distributed Query Processing.
The cost-effective reduction of relations by semijoins is the basis of the heuristic approach to distributed query processing. The cost-effectiveness of a semijoin was simply determined in the literature assuming that the ...
Trie Hashing with Controlled Load .
Trie hashing is an access methods to primary key ordered dynamic files. The key address is computed through a trie. Key search needs usually one disk access since the trie may be in core and needs two accesses for very ...
Interoperability of Multiple Autonomous Databases .
Database systems were a solution to the problem of shared access to heterogeneous files created by multiple autonomous applications. To make the data usage easier, one proposed to replace the autonomous files by a globally ...
Expert Database Systems: Efficient Support for Engineering Environments.
Manufacturing and Engineering processes use both large scale data and knowledge bases, and the use of expert systems in such environments has become a necessity. Expert Database Systems have evolved from conventional ...
Combining Joins and Semijoins in Distributed Query Processing.
A new approach to distributed query processing is proposed. In the conventional approach, a query is processed by the reducing phase and the joining phase. In the reducing phase, the relations referenced in the query are ...
Operational Specification of Update Dependencies.
Update dependencies are the basis of a new formalism for operational database specification.
PSQL: An Efficient Pictorial Database System.
Pictorial databases require efficient and direct spatial search based on the analog form of spatial objects and relationships instead of search based on some cumbersome alphanumeric encodings of the pictures. This paper ...
Using 2-way Semijoins in Distributed Query Processing.
In distributed query processing, the semijoin has been used as an effective operator in reducing relations referenced in the query to reduce the total amount of data transmission. In this paper, we propose a new relational ...
A database system should support a rich variety of meta-data describing and controlling the management and use of data. Few present database systems provide even rudimentary integrated meta-data management facilities.
High Performance Engineering Information Systems.
We present a framework for developing High Performance Engineering Information Systems (EIS) based on Incremental Computation Models. These models utilize results of previous computations stored in persistent cache structures ...