Rebuilding “in-doubt” states reliably after...

Details Rebuilding “in-doubt” states reliably after... Rebuilding “in-doubt” states reliably after...

2005-05-17

2005-05-17

Beausoliel, Robert (Department: 2113)

Error detection/correction and fault detection/recovery

Data processing system error or fault handling

Reliability and availability

C714S021000

Reexamination Certificate

active

06895529

ABSTRACT:
A data processing system participating in two-phase transaction processing operations which, when a system failure occurs while one or more transactions are in process, can successfully rebuild “in-doubt” states even when another system failure occurs during an attempt to effect the rebuild. The system includes a file management system having exclusive access to reserved locations in the memory for reading and writing meta-data therein and physical file access logic selectively coupling the memory and the database access application, the physical file access logic incorporating file protections which are controlled by the file management system; such that, in the event of a failure, the local state of the transaction can be faithfully rebuilt after restart by accessing the meta-data. Upon restart after a failure, the results of incomplete non-“in-doubt” transactions are removed, the files which have been updated by “in-doubt” transactions are locked and normal access to the affected database is then permitted.

REFERENCES:
patent: 5734817 (1998-03-01), Roffe et al.
patent: 6182241 (2001-01-01), Ngai et al.
patent: 6510421 (2003-01-01), Ganesh et al.
patent: 6584582 (2003-06-01), O'Connor
patent: 6732124 (2004-05-01), Koseki et al.
patent: 6748550 (2004-06-01), McBrearty et al.

Affiliated with

Also associated with

Rating

Rebuilding “in-doubt” states reliably after... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Rebuilding “in-doubt” states reliably after..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Rebuilding “in-doubt” states reliably after... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3400026