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The efficient execution of a method has a great impact on a system response time. Optimising access to data returned by methods is difficult as methods are written in high-level programming languages. Moreover, estimating a method's execution cost is another serious problem because of the complexity of a method's code. A promising technique to tackle the problem of optimising execution of methods is based on method materialisation. Within our project we developed, so called, hierarchical method materialisation technique. In this paper we present a prototype system for hierarchical materialisation of methods and for the management of their results in an object-oriented database.

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