Patent ID: 7275072
Filing Date: 2007-09-25
Classification: G06F,Y10S

Abstract:
1. A database management method with selection of a database management node in a database system including an operating node, a plurality of database management nodes, and an external storage unit having data areas, comprising: arranging each database management node of said plurality of database management nodes; accessing a table of a database management node by said operating node without saving each reference request frequency of a data area in a reference table at each time referencing data of said data areas from said plurality of database management nodes accessed by said operating node, wherein the table in a data area of a plurality of data areas is allocated to the database management node; monitoring a referring status of each table of said tables to determine whether said each reference request frequency is greater or smaller than a predetermined threshold value to switch a table in the data area to a shared table or switch said shared table back to an ordinary table in an information table, in said operating node; in response to an access from an application in said operating node, determining whether or not a target table to be accessed from said application is the shared table based on contents of said reference table, determining if a type of a requested process is a reference or an update in a database management node that has been requested for accessing from said operation node, determining whether or not the target table is the shared table based on said information table,