Database backup method
August 11, 2004. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3588839 3889237 3905023 Instruction retry mechanism for a data processing system Multi-processing system with a hierarchial memory having journaling and copyback System for facilitating the copying back of data in disc and tape units of a memory hierarchial system Microcomputer apparatus Cache/disk subsystem Store-in-cache processor means for clearing main storage Patent #: 4399506 InventorApplicationNo. 06/634460 filed on 07/26/1984US Classes:707/10, Distributed or remote access707/204Archiving or backupExaminersPrimary: Williams, Catherine S.Assistant: Munteanu, Florin Attorney, Agent or FirmInternational ClassesG06F 11/14 (20060101)H04Q 11/04 (20060101) AbstractA method of generating a backup copy of a database system. Modifications made to the database since the generation of a prior backup copy are summarized in a bit map on a page basis. When the next backup copy is made, only modified pages are transmitted and merged with the prior copy. Plural backup passes are made. New modifications are allowed to occur to the database on all but the last pass. Any database modification made at an address that has already been examined during a pass is backed-up during the next pass. Modifications are locked out at the beginning of the last pass to allow the final generation of a consistent and complete backup copy.Other References
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