Patent ID: 11954121
Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 10:
11. The selection method according to claim 10, wherein:
the database system duplicates data to a second database system at another site,
the selection device holds a write time and a read time of each of a plurality of nodes of the second database system, and
the selection method comprises:
extracting a given number of write times in descending order of length of the write times of the plurality of nodes of the second database system; and
when a requirement value of the write time is longer than a minimum write time among the extracted write time, selecting a case in which a completion response has been made from the second database system as the first response condition, and selecting a case in which data has been received from any of the plurality of nodes of the database system as the second response condition and, as a third response condition in which the second database system sends back a completion response in response to the data write request, selecting a case in which a completion response has been made from any of the plurality of nodes of the second database system.