Safe and Efficient Sharing of Persistent Objects in Thor (1996)
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BibTeX
@MISC{Liskov96safeand,
author = {B. Liskov and A. Adya and M. Castro and M. Day and S. Ghemawat and R. Gruber and U. Maheshwari and A.C. Myers and L. Shrira},
title = {Safe and Efficient Sharing of Persistent Objects in Thor},
year = {1996}
}
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Abstract
Thor is an object-oriented database system designed for use in a heterogeneous distributed environment. It provides highly-reliable and highly-available persistent storage for objects, and supports safe sharing of these objects by applications written in different programming languages. Safe heterogeneous sharing of long-lived objects requires encapsulation: the system must guarantee that applications interact with objects only by invoking methods. Although safety concerns are important, most object-oriented databases forgo safety to avoid paying the associated performance costs. This paper gives an overview of Thor's design and implementation. We focus on two areas that set Thor apart from other objectoriented databases. First, we discuss safe sharing and techniques for ensuring it; we also discuss ways of improving application performance without sacrificing safety. Second, we describe our approach to cache management at client machines, including a novel adaptive prefetching strat...
