Data processing: database and file management or data structures – Database design – Data structure types
Reexamination Certificate
2005-09-20
2005-09-20
Bataille, Pierre (Department: 2186)
Data processing: database and file management or data structures
Database design
Data structure types
C711S159000
Reexamination Certificate
active
06947956
ABSTRACT:
A database manager selectively caches journal entries for certain database changes based on dynamic selection criteria. Preferably, a journal disk drive is provided for storing changes to the database. Database change entries are sequentially cached in a main memory journal buffer, awaiting journal write. When a buffer is filled, its buffer contents are written to the journal disk. However, certain change operations will cause the contents of the buffer to be written to the journal disk immediately, before filling the buffer. Certain database change entries selectively cause the buffer to be written, depending on dynamic selection criteria. Preferably, these selection criteria take into account both the estimated time to recover in the event of a system crash and the current level of activity on the system. Generally, the busier the system, the more data will be cached, and vice versa.
REFERENCES:
patent: 4228501 (1980-10-01), Frissell
patent: 4425615 (1984-01-01), Swenson et al.
patent: 5574897 (1996-11-01), Hermsmeier et al.
patent: 5625820 (1997-04-01), Hermsmeier et al.
patent: 5991835 (1999-11-01), Mashimo et al.
U.S. Appl. No. 10/074,889, “Method and Apparatus for Data Recovery Optimization in a Logically Partitioned Computer System,” filed Oct. 29, 2001.
Olstad Chad Allen
Ricard Gary Ross
Stallman Adam Thomas
Youngren Larry William
Bataille Pierre
International Business Machines - Corporation
Truelson Roy W.
Tsai Sheng-Jen
LandOfFree
Method and apparatus for selective caching of transactions... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for selective caching of transactions..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for selective caching of transactions... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3442738