FILE COMPRESSING SYSTEM BY WORK CHARACTERISTIC

摘要

PURPOSE:To compress a data quantity stored in a data base, by representing a work data generated in every period, by its transition state. CONSTITUTION:Assuming that a data shown in the figure has been generated, every transition of those data attributes is encoded, and held as a table in a center device 2. The transition of the data attribute is generated in the first period, the third period and the sixth period, the transition of the data attributes in the respective periods is replaced with a code, and its transition state is stored in a data base 3. In this state, in case the present period (the eight period) has been inputted, the data which has been stored in the data base 3 is read out, and by deriving a transition code of the data which has occurred in the end, from the transition table, it can be decided that the final data attribute of the previous period (the seventh period) is C, and the transition of the attribute is not generated in the first data of the eight period. Subsequently, a variation C A of the attribute which has been generated in the fourth data of the present period (the eight period) is encoded from the transition table, and the transition code is stored in the data base 3 together with the transition period.