The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 20, 2005
Filed:
Jun. 06, 2002
Chad Allen Olstad, Rochester, MN (US);
Gary Ross Ricard, Chatfield, MN (US);
Adam Thomas Stallman, Rochester, MN (US);
Larry William Youngren, Rochester, MN (US);
Chad Allen Olstad, Rochester, MN (US);
Gary Ross Ricard, Chatfield, MN (US);
Adam Thomas Stallman, Rochester, MN (US);
Larry William Youngren, Rochester, MN (US);
International Business Machines Corporation, Armonk, NY (US);
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.