| 摘要 |
A client connected to an IP network has a unit for adding an inquiry identifier when an inquiry is made to a DB server, and a unit for accumulating time information together with the inquiry identifier when the inquiry is transmitted and a result is received. A DB server connected to the IP network and a storage network has a unit for adding the received inquiry identifier when the result is transmitted to a client and the inquiry is received, and a unit for accumulating time information together with the inquiry identifier when the inquiry is received, when I/O is requested to the storage, when an I/O result is received from the storage, and when the result is transmitted to the client.
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