Object migration mechanisms to support updates in object-oriented databases

Proceedings. PARBASE-90: International Conference on Databases, Parallel Architectures, and Their Applications Pub Date : 1990-03-07 DOI:10.1109/PARBSE.1990.77163

M. El-Sharkawi, Y. Kambayashi

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引用次数: 13

Abstract

Updates in object-oriented database systems are studied. It is pointed out that, owing to the richness of the object-oriented data model, updating an object may affect the object's position in the class lattice. Three types of update operations on objects are considered: adding, dropping, and modifying instance variables. An update may cause object migration, that is, the updated object may change its current class. As the user may not be aware of the side effects of the update, the system has to take some actions to complete the user's update. Classes in a database schema are classified into three types: static, partially dynamic, and dynamic. This classification is based on the way in which an object in a class may migrate. It is shown that the notion of object migration affects answering queries in temporal object-oriented databases. The history of an object will be distributed among several classes in the scheme. Two approaches to determine the class of an object's version are presented.<>

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支持面向对象数据库更新的对象迁移机制

研究了面向对象数据库系统的更新。指出，由于面向对象数据模型的丰富性，更新对象可能会影响对象在类格中的位置。对象上有三种类型的更新操作:添加、删除和修改实例变量。更新可能会导致对象迁移，也就是说，更新的对象可能会更改其当前类。由于用户可能没有意识到更新的副作用，系统必须采取一些操作来完成用户的更新。数据库模式中的类分为三种类型:静态、部分动态和动态。这种分类基于类中的对象可能迁移的方式。在时态面向对象数据库中，对象迁移的概念影响查询的回答。对象的历史将分布在方案中的几个类中。给出了两种确定对象版本类的方法

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Proceedings. PARBASE-90: International Conference on Databases, Parallel Architectures, and Their Applications

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