Data logging method, apparatus, system and computer program

Details Data logging method, apparatus, system and computer program Data logging method, apparatus, system and computer program

2005-10-25

2005-10-25

Alam, Shahid (Department: 2172)

Data processing: database and file management or data structures

Database design

Data structure types

C707S793000, C717S170000

Reexamination Certificate

active

06959311

ABSTRACT:
A technique of logging updates to a plurality of data records into discrete pages in non-volatile storage, wherein a page partially full of data is known as a partial page. Identical partial pages I and I+1 are established in the logging process as quickly as possible. Thereafter, in response to a data segment D larger than the remaining space of a most recent updated partial page I, D is partitioned into a first segment D1sufficient to fill the remaining space of page I and a second data segment D2.Page I is updated with a first write operation to its present contents concatenated with D1,and identical partial pages containing D2are created at I+1 and I+2 with a second write operation, whereby those pages become pages I and I+1 for the next logging operation.

REFERENCES:
patent: 5247672 (1993-09-01), Mohan
patent: 5418940 (1995-05-01), Mohan
patent: 6067550 (2000-05-01), Lomet
patent: 6490594 (2002-12-01), Lomet

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