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1. (WO2013157099) DATABASE MANAGEMENT METHOD, DATABASE SYSTEM AND PROGRAM

Pub. No.:    WO/2013/157099    International Application No.:    PCT/JP2012/060496
Publication Date: Fri Oct 25 01:59:59 CEST 2013 International Filing Date: Thu Apr 19 01:59:59 CEST 2012
IPC: G06F 12/00
G06F 17/30
Applicants: Murakumo Corporation
株式会社Murakumo
YAMADA, Hiroyuki
山田 浩之
Inventors: YAMADA, Hiroyuki
山田 浩之
Title: DATABASE MANAGEMENT METHOD, DATABASE SYSTEM AND PROGRAM
Abstract:
The invention achieves a database management method that is capable of hierarchically constructing master nodes and of efficiently updating said master nodes. From a lower-level master node to a higher-level master node, the following are sent as a write set to the high-level master node: a shadow copy deployed in local memory; a heap tuple map; and a shadow index. The higher-level master node receiving said write set verifies whether an applicable update has already been executed and sends a record of the update as a transaction log to the lower-level master node, thereby enabling efficient database updating without a discrepancy, from the lower-level master node to the upper-level master node, and from the upper-level master node to the lower-level master node therebelow.