Database backup method

Details Database backup method Database backup method

1984-07-26

1987-08-11

Williams, Archie E.

Boots, shoes, and leggings

364300, G06F 1300

Patent

active

046866205

ABSTRACT:
A 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.

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John Kaunitz et al, "Data Base Backup-The Problem of Very Large Data Bases," The Australian Computer Journal, vol. 13, No. 4, November 1981, pp. 136-142.
Houtan Aghili et al, "A Practical Guide to the Design of Differential Files for Recovery of On-Line Databases," ACM Transactions on Database Systems, vol. 7, No. 4, Dec. 1982, pp. 540-565.
D. J. Rosenkrantz, "Dynamic Database Dumping".

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