History preservation in a computer storage system

Details History preservation in a computer storage system History preservation in a computer storage system

2011-07-26

2011-07-26

Alam, Hosain T (Department: 2166)

Data processing: database and file management or data structures

Database and file access

Database access control methods

C707S783000, C707S802000

Reexamination Certificate

active

07987197

ABSTRACT:
A method by which a disk-based distributed data storage system is organized for protecting historical records of stored data entities. The method comprises recording distinct states of an entity, corresponding to different moments of time, as separate entity versions coexisting within the distributed data storage system, and assigning expiration times to the entity versions independently within each of a plurality of storage sites according to a shared set of rules, before which times deletion is prohibited.

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