Storage control method for database recovery in logless mode

Details Storage control method for database recovery in logless mode Storage control method for database recovery in logless mode

2008-04-01

2008-04-01

Verbrugge, Kevin (Department: 2189)

Electrical computers and digital processing systems: memory

Storage accessing and control

Specific memory composition

C711S162000, C707S793000, C707S793000, C714S006130

Reexamination Certificate

active

11396644

ABSTRACT:
The present invention is constituted so as to enable the recovery of a database even when a log comprising a DB update history is not created. When executing a transaction in the logless mode, a logless-start log is created and written to a primary log VOL55A at the start of this transaction, and this logless-start log is also written to a secondary log VOL55B. Thereafter, batch processing is carried out for a DB of a primary DB VOL51A, and while this transaction is being executed, the pair-split state of the DB VOL is cancelled either prior to the start or after the end of the batch processing, and if the difference between the DB VOLs is eliminated subsequent to the end of batch processing, a logless-end log is created and written to the primary log VOL55A, and this log is also written to the secondary log VOL55B.

REFERENCES:
patent: 5640561 (1997-06-01), Satoh et al.
patent: 6912632 (2005-06-01), Mori
patent: 2004/0107325 (2004-06-01), Mori
patent: 2006/0129608 (2006-06-01), Sato et al.
“Transaction Processing: Concepts and Techniques,” by Jim Gray and Andreas Reuter, Morgan Kaufmann Publishers, 1993.

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