Cooperative database systems

Cooperative Database Systems

In recent years, there has been considerable interest in techniques that enhance the cooperative behavior of database systems and many different techniques have been developed. These techniques approach the goal of cooperation in diverse ways; the differences may be in the specific task in which they offer cooperation, in the details of the solution, and even in the very interpretation of coope...

Cooperative Answers in Database Systems

Emulating Cooperative Transactions upon Standard Database Systems

Complex database applications like CAD/CAM or CASE introduce the need for long duration and/or cooperative transactions. Unfortunately, commercial DBMSs generally support a flat transaction model without cooperation. While many studies have been conducted on the management of more powerful transaction models on top of existing DBMSs (e.g., workflow management), few attention has been paid on tr...

A Framework for Cooperative Deductive Database Systems

In this paper, we address one important aspect of the problem of designing a cooperative deductive database system, namely, allocation of rules across the deductive database systems. We identify communication cost as the primary consideration in allocation of rules. The problem of optimal allocation of rules has been shown NP-complete, which has prohibitive execution times for large knowledge b...

CoSent: A Cooperative Sentinel for Database Systems

Active database systems have received increasing interest from both research and industrial communities. However, trigger conditions in the active rules are often dif-cult to specify, especially as the events and/or conditions complexities increase. To remedy this problem, we propose an active database system that supports rules with conceptual terms, approximate operators, and complex events. ...