US 7,321,907 B2
Method and system for managing multiple database storage units
Masashi Tsuchida, Machida (Japan); Nobuo Kawamura, Atsugi (Japan); and Nobuyuki Yamashita, Yokohama (Japan)
Assigned to Hitachi, Ltd., Tokyo (Japan)
Filed on Aug. 30, 2004, as Appl. No. 10/929,699.
Application 10/929699 is a continuation of application No. 09/944262, filed on Aug. 31, 2001, granted, now 6,829,623.
Application 09/944262 is a continuation of application No. 09/907049, filed on Jul. 17, 2001, granted, now 6,801,921.
Claims priority of application No. 2000-278671 (JP), filed on Sep. 08, 2000.
Prior Publication US 2005/0027759 A1, Feb. 03, 2005
Int. Cl. G06F 17/30 (2006.01)
U.S. Cl. 707—204  [707/104.1; 707/203] 4 Claims
OG exemplary drawing
 
1. A method of archiving data, comprising the steps of:
maintaining first data in a first database, the first format being chronological, the first data being divided into a first predetermined number of first data portions each representing a first consecutive time period;
maintaining second data in a second database, the second data being also chronological and being divided into a second predetermined number of second data portions each representing a second consecutive time period that is shorter than the first consecutive time period, the second predetermined number of the second consecutive data portions corresponding to one of the first data portions;
determining a point in time for a predetermined database management task to update the first data based upon the second predetermined number of the second data portions;
consolidating the second consecutive data portions into a corresponding one of the first data portions; and
subsequently updating the first database to reflect said consolidating step.