Page map, metamap, and relation group file management supervised by

Abstract

A file storage management system for managing pages in a file, in which pages, data items belonging to a plurality of relations are stored. The file storage management system includes a data file for storing data items belonging to relations page by page, a page map file storing information representing positions at which data pages and empty pages are positioned in the file, a metamap file for storing metamap information representing whether or not the data empty pages and the data pages exist in each page map, relation group definition file for information representing whether relations are friendly relations or exclusive relations a page management unit for managing the data file, a page map management unit for managing the page map file, a metamap management unit for managing the metamap file, a relation group management unit for managing the relation group definition file, and page operation unit for operating the page management unit, the page map management unit, the metamap management unit, the relation group management unit so that a process for allocating data items belonging to relations to pages, and a process for searching for pages to be released from management in the system and for pages storing data items to be loaded into a main memory are carried out.