Inventor
USHIJIMA KAZUTOMO
JP25 patents
⚠️ This page may combine multiple inventors who share the name “USHIJIMA KAZUTOMO”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
HITACHI LTD
20 patentsUS6381601B1Apr 30, 2002
Grouping and duplicate removal method in a database
HITACHI LTD234 citations99
US7111019B1Sep 19, 2006
Data warehouse system and query processing method used in the system, and data collecting method and apparatus for the method, and charging method and apparatus in the system
HITACHI LTD43 citations92
US6014655AJan 11, 2000
Method of retrieving database
HITACHI LTD39 citations92
US5890150AMar 30, 1999
Random sampling method for use in a database processing system and a database processing system based thereon
HITACHI LTD50 citations92
US6832216B2Dec 14, 2004
Method and system for mining association rules with negative items
HITACHI LTD21 citations91
US8041685B2Oct 18, 2011
Method of changing system configuration in shared-nothing database management system
HITACHI LTD10 citations84
US7680813B2Mar 16, 2010
Information management system
HITACHI LTD8 citations84
US7617265B2Nov 10, 2009
Indexing method of database management system
HITACHI LTD10 citations84
US7370029B2May 6, 2008
Method of changing system configuration in shared-nothing database management system
HITACHI LTD14 citations84
US7966307B2Jun 21, 2011
Document search method and document search apparatus that use a combination of index-type search and scan-type search
HITACHI LTD11 citations83
US7228416B2Jun 5, 2007
Database access method and system capable of concealing the contents of query
HITACHI LTD17 citations82
US10366075B2Jul 30, 2019
Database management system and method
HITACHI LTD7 citations79
US6898594B2May 24, 2005
Integrated database system and program storage medium
HITACHI LTD7 citations72
US7899851B2Mar 1, 2011
Indexing method of database management system
HITACHI LTD5 citations63
US10515071B2Dec 24, 2019
Database management system and database management method using logical addresses and timestamps
HITACHI LTD1 citations62
US7167854B2Jan 23, 2007
Database control method
HITACHI LTD4 citations62
US10025675B2Jul 17, 2018
Log management method and computer system
HITACHI LTD1 citations47
US7526509B2Apr 28, 2009
Information lifecycle managing system and its data arrangement determining method
HITACHI LTD0 citations42
US10565190B2Feb 18, 2020
Index tree search method and computer
HITACHI LTD0 citations40
US7752216B2Jul 6, 2010
Retrieval apparatus, retrieval method and retrieval program
HITACHI LTD0 citations34