13. A non-transitory computer readable storage medium storing one or more programs, the one or more programs comprising instructions for: providing a usage tracking engine in an in-memory database and in communication with usage data of a data object of the in-memory database; causing the usage tracking engine to track access to the data object by a database user; causing the usage tracking engine to receive a ranking of the data object from a heuristic learning module in the in-memory database that considers, a geographic location of the database user, a time stamp of access to the data object by the database user, and prior manual placement of the data object in a shelf by the database user; causing the usage tracking engine to check a personalization setting reflecting a number of data objects to be located on the shelf in an application layer accessible to the database user, the number based upon a storage capacity available to the database user; and causing the usage tracking engine to displace the data object from the shelf based upon the ranking and the personalization setting.
16. The non-transitory computer readable storage medium of claim 13 wherein the usage information is stored in the in-memory database.