«active database»
۳۹٬۹۶۶ نتیجهA Rewriting Technique for the Analysis and the Optimization of Active Databases
We propose a new formal semantics of active databases based on a transaction rewriting technique in the context of the relational model. A user deened transaction, which is viewed here as a sequence of atomic database updates forming a semantic unit, is translated by means of act
RBE: A Rule-by-Example Active Database System
In an active database system rules are used to monitor and respond to events that happen inside the database This paper presents the implementation of an active database system called RBE The system loosely couples OPS production system and INGRES database management system to e
Visualization of Rule Behaviour in Active Databases
One of the characteristics of database systems is the ability to efficiently handle large amounts of information. This characteristic must apply also when rules are introduced into database systems, resulting in so-called active database systems. Hence, active database systems ne
Analysis and optimization of active databases
We introduce a new formal semantics for active databases that relies on a transaction rewriting technique. A user de ned transaction, which is viewed here as a sequence of atomic database updates forming a semantic atomic unit, is translated by means of active rules into induced
The Theory of Active Databases vs. The SQL Standard
The concept of triggers has been used for almost thirty years. But taking into account the fact that the active database theory kept developing during the years, it is even more and more obvious that existing database management systems do not keep the pace with the theory i.e. t
Performance Evaluation of Active Database Management Systems Using the BEAST Benchmark
This paper presents the first comparative performance study of object-oriented active database management systems by using the BEAST benchmark. BEAST stresses the performance-critical components of active systems: event detection, event composition, rule retrieval, and rule firin
Deductive and Active Databases: Two Paradigms or Ends of a Spectrum?
This position paper considers several existing relational database rule languages with a focus on exploring the fundamental di erences between deductive and active databases. We nd that deductive and active databases do not form two discernible classes, but rather they delineate
The Dynamics of Active Database Rules: Models and Refinements
Semantics represents a major problem area for active databases inasmuch as (i) there is no formal framework for defining the abstract semantics of active rules, and (ii) the various systems developed so far have ad-hoc operational semantics that are widely different from each oth
Active Database Rules with Transaction-Conscious Stable-Model Semantics
Semantics represents a major problem area for active databases inasmuch as (i) there is no formal framework for defining the abstract semantics of active rules, and (ii) the various systems developed so far have ad-hoc operational semantics that are widely different from each oth
Enhancing ECA Rules for Distributed Active Database Systems
ECA (event/condition/action) rules have been developed for central active database systems. In distributed active database systems the problem of inaccessibility of partial systems raises and thus the undecidability of ECA conditions referring to remote systems. This work propose