Abstract Fine-Granularity Signature Caching in Object Database Systems

In this paper, we present the SigCache approach. In contrast to traditional signature files where signatures are stored in separate files, signatures are in our approach stored together with their objects. In addition, the most frequently accessed signatures are stored in a main memory signature cache (SigCache). When using the signatures stored in the SigCache as a filter during perfect match queries, the number of objects that actually have to be retrieved during perfect match queries can be reduced. The increase in update cost is insignificant, because the signatures are much smaller than the objects. Key words: object database systems, signature files, buffer management, query processing