| 摘要 |
PURPOSE:To secure a message and reduce recovery log data by performing recovery processing not for a file stored with the message, but for a control table. CONSTITUTION:The file F2 consists of only a message storage area and the control table CT consisting of QT and QCT is provided newly. The QT of the control table CT consists of areas for pointing in-use QCT and free QCT; and the QCT corresponds to blocks of the file F2 stored with messages one to one and point information to the blocks is calculated relatively to the QCT. Further, the QCT consists of a status area for information on the head and tail, etc., of the message and an area for pointing the number of the next block. Therefore, the QT and QCT consist of several bytes. |
