Query result caching is an important mechanism for search engine efficiency. In this study, we first review several query features that are used to determine the contents of a static result cache. Next, we introduce a new feature that more accurately represents the popularity of a query by measuring the stability of query frequency over a set of time intervals. Experimental results show that this new feature achieves hit ratios better than those of the previously proposed features.
REF propose using the standard deviation of query frequency in static result caching.
Static query result caching revisited
In Proc. 17th Int’l Conf. on World Wide Web
Computer Science