The Historical Performance screen

Space Retained

Memory used by the cache over the past couple days. The time shown is a much longer period than the cache size graph on the Cache Summary tab, which only displays the past 15 minutes.

In this case, the x-axis represents the average values for each time period during each of the past eight days. This is to allow for comparison of cache behaviors against hourly trends.

Hits and Misses (stacked)                   

Number of hits (object was found in the cache) and misses (object was not found in the cache) and the miss percentage over the past day and past seven days.

Miss %                                                   

The percentage of cache read attempts in which the object was not found in the cache over the past day and the past seven days.

Number of Misses because item was evicted when cache was full                

The number of misses over the past day and the past seven days due to PolicyCenter having evicted an object from the cache because the cache was full.