发明名称 |
METHOD AND APPARATUS FOR LOGGING JOURNAL DATA USING A LOG WRITE AHEAD DATA SET |
摘要 |
<p>The invention provides a computing apparatus and method for maintaining a journal log. The computing apparatus includes volatile storage for storing a log buffer and a non-volatile storage for storing a journal log. Non-volatile storage means are provided for storing in a write-ahead data set a plurality of short data blocks. The log buffer contents are written to the write-ahead data set responsive to a process epoch occurring before the log buffer is filled. The log buffer contents are written to the journal log upon the log buffer being filled. The redoing or undoing of data base changes is made with reference to the write ahead data set only in the case of a system failure resulting in loss of log buffer data not yet written to the journal log; otherwise data base changes are redone or undone with reference to the log buffer or journal log.</p> |
申请公布号 |
EP0098928(A3) |
申请公布日期 |
1987.04.08 |
申请号 |
EP19830104295 |
申请日期 |
1983.05.02 |
申请人 |
INTERNATIONAL BUSINESS MACHINES CORPORATION |
发明人 |
GAWLICK, DIETER;GRAY, JAMES NICHOLAS;IIMURA, WALLACE MITSUO;OBERMARCK, RONALD LESTER |
分类号 |
G06F12/00;G06F7/22;G06F9/44;G06F9/46;G06F11/14;G06F11/34;G06F17/30;(IPC1-7):G06F11/00 |
主分类号 |
G06F12/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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