1. A computer program product for retention of content in a cache memory supporting database operations, the computer program product comprising: a computer readable storage medium having program instructions embodied therewith, wherein the program instructions are executable by a computer processor to cause the computer processor to perform a method comprising: tracking a frequency of access requests of a first index and a second index of a database table, corresponding respectively to a first data page and a second data page of a plurality of data pages residing in cache memory; recording in a first data structure, each instance of access requests for the first index and the second index as a count of access requests, including a date and time of each respective instance of access request; determining whether the frequency of access requests of the first index corresponding to the first data page residing in cache memory, and the second index corresponding to the second data page residing in cache memory, respectively, exceeds a target of access request frequency, wherein the frequency of access request is calculated based on the count of access requests within a configurable period of time; responsive to determining the frequency of access requests of the first index exceeds the target of access request frequency, and the frequency of access requests of the second index fails to exceed the target of access request frequency, applying an attribute of priority to the first index to retain the first data page, corresponding to the first index within the cache memory, relative to the second data page that corresponds to the second index, wherein applying the attribute of priority to the first index corresponding to the first data page, further comprises adding the first index and a value of the frequency of access request associated with the first index to a second data structure that includes information associated with indices of respective data pages having frequency of access requests exceeding the target of access request frequency; determining a change to the frequency of access request of the first index as a start and an end of the configurable period of time progresses; and in response to determining an expiration of the attribute of priority to retain the first index within the cache memory, based on the frequency of access requests associated with the first index falling below the target of access request frequency as the start and the end of the configurable period of time progresses, removing the attribute of priority to retain the first index within the cache memory, by removing the information associated with the first index from the second data structure.