In a hierarchical storage management system, files are automatically archived when they have not been accessed for a specified period. With large database files, the file cannot be archived, even though only a small number of records has been used. In this invention an auxiliary database is maintained...http://www.google.de/patents/US5617566?utm_source=gb-gplus-sharePatent US5617566 - File portion logging and arching by means of an auxilary database
