Titlebook: ICDT ‘90; Third International Serge Abiteboul,Paris C. Kanellakis Conference proceedings 1990 Springer-Verlag Berlin Heidelberg 1990 Autom

chuckle

机械

A comparative analysis of two-phase-commit protocols,can be twice as fast. The communication time of the decentralized algorithm is better than that of tree-commit, whereas tree-commit wins as far as communication cost is concerned. When comparing the communication-complexity of the two algorithms, namely the product of the communication cost and the communication time, tree-commit wins.

Gesture

公猪

relieve

联想记忆

Representing object identity in a pure functional language,the concept is intuitively clear, its precise semantics has not yet been well established. This seems to be a major obstacle to achieve a clean integration of object-oriented databases and other paradigms of database programming in a modern type system of a programming language. This paper attempts

CHECK

A class abstraction for a hierarchical type system,s usually enriched with the possibility of imposing a set-inclusion relation among different collections. We call “class” such a data structure characterized by its ability of collecting values and of being in a containment relation with other classes. In many languages the class notion is not reali

召集

Algebraic optimization of object-oriented query languages,res, e.g. arrays and quadtrees, and an integration with the object-oriented programming paradigm. Declarative object-oriented languages transfer the burden of choosing an efficient execution plan to the database query optimizer. The lack of a generally accepted object-oriented data model and the tre

Conspiracy

针叶树

Maintaining bounded disorder files in multiprocessor multi-disk environments,ng split. It guarantees good performance for single-key operations (e.g. search, insert, and delete), similar to that of hash based methods, and in addition, good performance for subrange operations, and reasonable performance for sequential-key operations. To obtain these capabilities, the index mu