Browsing by Subject "Active database systems"

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    Construction of trigger and dependency graphs using event and rule declarations of an active object-oriented database management system
    (1997-07) Tosun, Ali Şaman
    Traditional database systems are passive, meaning that they only react to explicit requests by users or applications. An active database S3^stem on the other hand, executes operations automatically when certain events occur and certain conditions are met. A database management system becomes cictive through the addition of rules. The main difficulties in the development of rule applications is the lack of design methods and suitable design tools. Confluence and termination are two important properties to be able to implement rule applications correctly. In this thesis, the construction of trigger and dependency graphs using class and rule declarations of an active object-oriented dcitabase system is described. The construction of these graphs provides that termination can be checked and a confluent rule execution can be achieved. Implementcition of a preprocessor that constructs trigger and dependency graphs is cilso provided.
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    Objective: a benchmark for object-oriented active database systems
    (1996) Çetintemel, Uğur
    Although much work in the area of Active Database Management Systems (ADBMSs) has been done, there have been only a few attempts to evaluate the performance of these systems, and it is not yet clear how the performance of an active DBMS can be evaluated systematically. In this thesis, we describe the OBJECTIVE Benchmark for object-oriented ADBMSs, and present experimental results from its implementation in an active database system prototype. OBJECTIVE can be used to identify performance bottlenecks and active functionalities of an ADBMS, and compare the performance of multiple ADBMSs. The philosophy of OBJECTIVE is to isolate components providing active functionalities, and concentrate only on the performance of these components while attempting to minimize the effects of other factors.