Title:
METHOD AND DEVICE FOR MAXIMUM USE OF UNDO LOG
Document Type and Number:
Japanese Patent JP2501152
Kind Code:
B2
Abstract:
PURPOSE: To minimize information to be recorded in an undo transaction at the time of the occurrence of a crash or a failure.
CONSTITUTION: It is discriminated whether a write block includes data which is not committed or not (1010) for the purpose of optimizing an undo log with a write-ahead log protocol. If it includes this data, an undo buffer is written in the undo log and a redo buffer is written in a redo log (1020). Thereafter or if it doesn't include this data (1010), the block is written in a permanent storage device (1030).
Inventors:
DEIUITSUDO BII ROMETSUTO
PIITAA EMU SUPIRO
ASHOOKU EMU JOTSUSHII
ANANTO RAGUHAAUAN
TEIRUMANJAANAMU KEI RENGARAJAN
PIITAA EMU SUPIRO
ASHOOKU EMU JOTSUSHII
ANANTO RAGUHAAUAN
TEIRUMANJAANAMU KEI RENGARAJAN
Application Number:
JP24286591A
Publication Date:
May 29, 1996
Filing Date:
June 14, 1991
Export Citation:
Assignee:
DIGITAL EQUIPMENT CORP
International Classes:
G06F12/00; G06F11/14; (IPC1-7): G06F12/00; G06F12/00
Domestic Patent References:
| JP62206645A | ||||
| JP63196958A |
Other References:
ｂｉｔ別冊ＡＣＭＣＯＭＰＵＴＩＮＧＳＵＲＶＥＹＳ’８３コンピュータサイエンス（１９８５）、Ｐ．１３７−１６４、共立出版
Attorney, Agent or Firm:
Minoru Nakamura (7 outside)