Patent ID: 8543553

Claim:
A method performed in a system for deleting data sets contained in a data list from a table system, comprising the following steps, said steps being carried out for all data sets of said data list: determining, in a system for importing and processing data, that a predetermined use period associated with a data list has expired; initiating, in the system, in response to the expired predetermined use period, a deletion process for the data list; performing a data-list level check that comprises: (i) determining, in the system, whether the data list has a predefined property of being rented; (ii) if the data list does not have the predefined property of being rented, maintaining the data list in the system, wherein individual determinations regarding whether data sets included in the data list have a predefined property of being rented are not performed in the deletion process; (iii) else, if the data list has the predefined property of being rented, reading each of the data sets; performing a data-set level check that comprises: (iv) determining, in the system, whether each of the read data sets have the predefined property of being rented; (v) if the data set does not have the predefined property of being rented, maintaining the data set in the system; and (vi) else, if the data set has the predefined property of being rented, deleting the data set in the system, and sending an indicator regarding the deleted data set to one or more sections in the table system.