Storage of multiple pre-modification short duration copies...

Details Storage of multiple pre-modification short duration copies... Storage of multiple pre-modification short duration copies...

2008-05-20

2008-05-20

Lewis, Cheryl (Department: 2167)

Data processing: database and file management or data structures

Database design

Data structure types

C707S793000

Reexamination Certificate

active

07376674

ABSTRACT:
A method and apparatus for storing snapshots (pre-modification copies of data) in short term memory is disclosed. In an embodiment, if short term storage is clogged, snapshot chains are copied to longer term memory. In an embodiment, snapshot chains that are older than any active transaction are discarded, and the storage space which the discarded snapshot chains occupy is reclaimed. In an embodiment, the snapshots are stored in chains in which the snapshots are ordered chronologically, and each snapshot is explicitly linked to the next oldest snapshot (if one exists) in the snapshot chain.

REFERENCES:
patent: 5956713 (1999-09-01), Bamford et al.
patent: 6829617 (2004-12-01), Sawdon et al.

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