Method and apparatus for maintaining a redundant database system

Details Method and apparatus for maintaining a redundant database system Method and apparatus for maintaining a redundant database system

1994-11-30

1997-07-15

Beausoliel, Jr., Robert W.

395620, 395488, G06F 1108, G06F 1730

Patent

active

056490895

ABSTRACT:
In a redundant controller system having an active controller (112) with an active data base and a standby controller (115) with a standby data base, the active controller (112) operably coupled to the standby controller (115), the active data base including a plurality of records, the plurality of records subject to modification, a method of updating the standby data base to mirror the active data base including modifying a record, the record including a record checksum, incorporating the record checksum into a virtual checksum (322) for the active data base, communicating the record including the record checksum to the standby data base (324), incorporating the record checksum into a standby checksum (410, 412) for the standby data base, and comparing the standby checksum to the virtual checksum (312) to insure the standby data base mirrors the active data base.

REFERENCES:
patent: 4849978 (1989-07-01), Dishon et al.
patent: 4958270 (1990-09-01), McLaughlin et al.
patent: 5049873 (1991-09-01), Robins et al.
patent: 5261092 (1993-11-01), McLaughlin et al.
patent: 5271023 (1993-12-01), Norman

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