Dynamic caches with miss tables

摘要: A middle-tier Web server (230) with a queryable cache (219) that contains items from one or more data sources (241). Items are included in the (223) on basis of probability future hits items. When source (241) determines an item has been changed, it sends update message to (230), which updates if is still cache. In preferred embodiment, database system and triggers used generate messages. access layer whether required by application program If is, obtains cache; otherwise, source. The includes miss table accelerates determination made up entries relate status query item. There three statuses: miss, indicating not cache, hit, unknown, known referenced, presented table. entry for instead attempting obtain attempts updated accordance result. copy added set indicate unknown.