Frederick M Perry

US Patent:

6526417, Feb 25, 2003

Filed:

Jan 25, 2000

Appl. No.:

09/491002

Inventors:

Frederick Stephen Perry - San Jose CA

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 1730

US Classification:

707202, 707204

Abstract:

The present invention establishes a merge end point in logs reflecting a sharing session with a common database. The merge end point is established at an earlier point to thereby reduce the number of unmergeable records. The system of the present invention includes a log archive module which determines the position of each log volume end-start point in the logs. A database recovery control module receives the positions of the log volume end-start points and determines the most recent log volume end-start point for each log. The database recovery control module next determines which of the most recent log volume end-start points has the earliest time value. This log volume end-start point is the latest identifiable point wherein all log records for all logs will be committed and is selected as the merge end point. A change accumulation utility is able to incorporate the merge end point in a CADS to separate unmergeable and mergeable log records.