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Database Support for Versions and Alternatives of Large Design Files

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2 Author(s)
Randy H. Katz ; Department of Computer Sciences, University of Wisconsin, Madison, WI 53706.; Department of Electrical Engineering and Computer Sciences, University of California, Berkeley, CA 94720. ; Tobin J. Lehman

We identify the roles played by design versions and alternatives in an engineering database. The obvious way to implement versions is to maintain each in a separate collection of files. Because several versions must be kept on line in a design environment, the approach leads to large disk requirements. We develop B-tree-based storage structures to encode versions as ``negative'' differential files. Our objective is to keep the disk requirements small. We discuss the effect of enormous amounts of cheap archival storage (write-once optical digital disks) on the proposed structures. We have implemented versions in the Wisconsin storage system (WiSS), an experimental database component developed at the University of Wisconsin-Madison.

Published in:

IEEE Transactions on Software Engineering  (Volume:SE-10 ,  Issue: 2 )