Abstract: Methods and apparatuses that store two or more items in a persistent cache with time stamps indicating similarity of the items are described. In response to receiving a request, one of the items uniquely identified by the request may be retrieved from the persistent cache. The retrieved item may have a time stamp. In one embodiment, additional items may be searched from the persistent cache according to the time stamp. The search may identify the additional items having time stamps similar to the time stamp of the retrieved item. The additional items may be retrieved from the persistent cache and stored in a memory cache to allow faster retrieval of the additional items when requested.