System and method for restoring a multiple checkpointed database

Details System and method for restoring a multiple checkpointed database System and method for restoring a multiple checkpointed database

1996-12-16

1999-01-26

Black, Thomas G.

Data processing: database and file management or data structures

Database design

Data structure types

707 7, 707201, 707202, G06F 1730

Patent

active

058648496

ABSTRACT:
For use with an active database stored in volatile memory for direct revision thereof, the active database having multiple checkpoints and a stable log, having a tail stored in the volatile memory, for tracking revisions to the active database to allow corresponding revisions to be made to the multiple checkpoints, the active database subject to corruption, a system for, and method of, restoring the active database and a computer system containing the same. The system includes: (1) a checkpoint determination controller that determines which of the multiple checkpoints is a most recently completed checkpoint and copies the most recently completed checkpoint to the volatile memory to serve as an unrevised database for reconstructing the active database and (2) a revision application controller that retrieves selected ones of the revisions from the stable log and the tail and applies the revisions to the unrevised database thereby to restore the active database. In an advantageous embodiment, the applied revisions include log records at an operation level (lower level of abstration than transactions), and the revision application controller, using memory locks while restoring the active database, releases ones of the memory locks as a function of applying ones of the log records.

REFERENCES:
patent: 5465328 (1995-11-01), Dievendorff
patent: 5469562 (1995-11-01), Saether
patent: 5481699 (1996-01-01), Saether
patent: 5592661 (1997-01-01), Eisenberg et al.

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