Abstract: The method for manufacturing a fin-tube heat exchanger includes the step of expanding each heat transfer tube extending through a corresponding tube insertion hole of a heat transfer fin with a tube expander inserted in heat transfer tubes. The expanding step includes a first sub-step of expanding the tube expander in a radial direction of the heat transfer tube to a radially expanded state while the tube expander is at rest in a first predetermined region to be expanded inside the heat transfer tube to bring the first predetermined region to be expanded into close contact with the tube insertion holes; and a second sub-step of releasing the tube expander from the radially expanded state to a radially contracted state and moving the tube expander to a second predetermined region to be expanded inside the heat transfer tube. The first and second sub-steps are alternately repeated.

Abstract: Database management involving obtaining a request of update of a record of a database including: (i) pages with records, each including data and transaction identification information (XID) that has a range that is divided by a predetermined range; and (ii) generation identification information (GID) that is increased when the XID's value exceeds the divided range, where the page includes a GID header indicating the earliest GID of the records of the page. Also, reading a page's GID header when switching pages, comparing the GID header with the present GID of the present XID, and performing a freeze process to the record having the XID included in the page's GID header when the GID header's value is less than the difference between the GID's value to which the present XID belongs and a predetermined value.

Abstract: A conductor transmits a commit processing request to directors in response to a commit request received from an application. Upon receipt of a response to the commit processing request from any one of the directors, the conductor notifies the application of a successful commit. If there is a pending transaction due to a failure in a director, the conductor instructs the director to process the pending transaction upon recovery from the failure. If a failure occurs in the conductor during transmission of the commit processing request and the commit processing request is not received by any of the directors, the conductor inquires the director whether there is a pending transaction after recovery from the failure, and instructs the director to process the pending transaction based on a processing result of the pending transaction obtained from another director.

Abstract: A data presentation device with a memory storage area being used without any futility is disclosed.

Abstract: According to an aspect of an embodiment, a method for managing a database for records of transactions, each of the transaction specifying an order of processing, and being associated with a value related to generation of the transaction, said database comprising a plurality of page data containing a plurality of records, each of the records comprising data and information indicative of the value of one of said transactions, the method comprising the steps of: reading out one of said page data containing a target record of request of a transaction associated with the target record from said database; evaluating each value associated with the transactions in the page data; and invaliding the record associated with a value greater than a predetermined value.

Abstract: A data presentation device with a memory storage area being used without any futility is disclosed.

Abstract: A conductor transmits a commit processing request to directors in response to a commit request received from an application. Upon receipt of a response to the commit processing request from any one of the directors, the conductor notifies the application of a successful commit. If there is a pending transaction due to a failure in a director, the conductor instructs the director to process the pending transaction upon recovery from the failure. If a failure occurs in the conductor during transmission of the commit processing request and the commit processing request is not received by any of the directors, the conductor inquires the director whether there is a pending transaction after recovery from the failure, and instructs the director to process the pending transaction based on a processing result of the pending transaction obtained from another director.