Managing copies of data

Details Managing copies of data Managing copies of data

2007-03-30

2010-06-08

Ehichioya, Fred I (Department: 2156)

Data processing: database and file management or data structures

Database or file accessing

Query processing

C707S999100, C707S999200

Reexamination Certificate

active

07734669

ABSTRACT:
A method in a computer system for retrieving data from one of multiple copies of the data is provided, referred to as the data management system. The data management system receives a request identifying at least one data object to be accessed. Then, the data management system queries a metabase to locate data copies that contain the identified at least one data object, wherein the data copies are created from similar source data, and wherein for each data copy the metabase contains an indication of the availability of the copy relative to other copies. Next, the data management system determines one of the located data copies to use to access the identified at least one data object, wherein the determination is made based on the indicated availability contained in the metabase for each of the located data copies. Then, the data management system accesses the identified at least one data object using the determined one of the located data copies.

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