View materialization techniques for complex hierarchical objects
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The MultiView project: object-oriented view technology and applications
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Hierarchical Materialisation of Method Results in Object-Oriented Views
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RIDE '96 Proceedings of the 6th International Workshop on Research Issues in Data Engineering (RIDE '96) Interoperability of Nontraditional Database Systems
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View materialization is known to be a valuable technique for performance optimization in relational databases, and much work has been done addressing the problem of consistently maintaining relational views under update operations. However, little progress has been made thus far regarding the topic of view materialization in object-oriented databases (OODBs). In this paper, we demonstrate that there are several significant differences between the relational and object-oriented paradigms that can be exploited when addressing the object-oriented view materialization problem. We can use the subsumption relationships between classes to identify branches of classes to which we do not need to propagate updates. Similarly, we can use encapsulated interfaces combined with the fact that any unique database property is inherited from a single location to provide a ``registration/notification'' service for optimizing incremental view updates. We have successfully implemented all proposed techniques in the MultiView system, which provides updatable materialized classes and virtual schemata on top of the GemStone OODBMS. We also report results from the experimental studies we have run on the MultiView system measuring the impact of various optimization strategies incorporated into our materialization update algorithms.