1. A parallel computer system comprising: an in-memory database in the memory of a plurality of fully functional compute nodes; a database loader for pre-loading the in-memory database to optimize database efficiency by clustering database attributes into the in-memory database, wherein clustering database attributes comprises placing data corresponding to a first attribute for a plurality of records together on a first compute node of the computer system and placing data corresponding to a second attribute for the plurality of records together on a second compute node of the computer system; and wherein the database loader clusters the database attributes based on a use flag in an SQL statement that indicates an anticipated access frequency of placing a record of the plurality of records in the in-memory database.