A system and methods for rapid unloading and reorganization of hierarchical databases. Overflow and a window of blocks are progressively read into memory. Unloading proceeds as the scan cylinders window moves ahead. The reading of blocks stays about scan cylinders ahead of the unload. As a segment is...http://www.google.de/patents/US6622142?utm_source=gb-gplus-sharePatent US6622142 - Database utilities
