A system, method and article of manufacture for identification of mergeable data in a data processing system and, more particularly, for providing mechanisms for facilitating identification of correlated columns from one or more database tables. One embodiment provides a computer-implemented method for managing storage of data having an associated measurement unit in a database table. The method includes storing the data in a column of the database table and generating units metadata describing the measurement unit. The units metadata is associated with the column of the database table.