Dual-buuering Strategies in Object Bases

In this work, control strategies for combining two potentially powerful buuer management techniques in object bases were devised and evaluated: (1) buuer pool segmentation with segment-speciic replacement criteria, and (2) dual buuering consisting of copying objects from pages into object buuers. Two dimensions exist for exerting control on the buuer pool: (1) the copying time which determines at what time objects are copied from their memory-resident home page, and (2) the relo-cation time which determines when a (copied) object is to be transferred back to its home page. Along both dimensions, it is possible to diierentiate between an eager and a lazy strategy. The extensive experimental results indicate that lazy object copying combined with an eager relocation strategy is almost always superior and signiicantly outperforms page-based buuering in most applications.