The field management mode null in the large-scale knowledge

摘要

PURPOSE:To reduce the cost of maintenance by swapping out all instances belonging to a class whose access frequency is low and which has a possibility for releasing the large area at the time of releasing an area. CONSTITUTION:When a user generates an object and stores it in a data base, or when the object existing in an external storage device 2 is read into a main storage, it is necessary to secure the area for placing the object on the main storage. At that time, an area securing request 4 is inputted to an area securing means 5. The means 5 secures the area having capacity in which the object concerned can be stored on the main storage. When the main storage is filled with the other objects, and target capacity cannot be secured, an area releasing request 6 is inputted to an area releasing means 7 so that it releases the storage area of the object which is previously stored. The means 7 receiving the request 6 refers class unit area information, decides the area to be released and swaps out the area to the device 2.