Boots – shoes – and leggings
Patent
1991-05-16
1995-01-31
Black, Thomas G.
Boots, shoes, and leggings
364DIG1, 36422282, 3642653, 3642665, G06F 1540
Patent
active
053865545
ABSTRACT:
A data management system, which is equipped with a data file and a journal file and adapted to reserve the exclusive occupation for data and then update the data, is characterized by releasing the exclusive occupation of data prior to writing of a journal to the journal file and of corresponding updated data to the data file. When data on a data base is updated, the exclusive occupation states of data to be updated are reserved first and then updating of the data is executed on a data buffer placed on a main memory and journals on the updating of the data are collected. The collected journals are entered into a first-in first-out journal queue in units of transactions. The exclusive occupation states of data on a corresponding transaction is released after corresponding journals have been stored in the journal queue. The journals stored in the journal queue are written to the journal file in units of transactions in the order in which they are entered into the queue. Subsequently updated data is written to the data file. The data in the data file is restored using the journal file when a system failure occurs in the data base.
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Gray, J., "Notes on Data Base Operating Systems", Operating Systems, an Advanced Course, 1977 pp. 394-481.
Black Thomas G.
Kabushiki Kaisha Toshiba
Loomis John C.
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