Versioned database system with multi-parent versions

Details Versioned database system with multi-parent versions Versioned database system with multi-parent versions

2002-07-25

2010-11-16

Robinson, Greta L (Department: 2169)

Data processing: database and file management or data structures

Data integrity

Policy, rule-based management of records, files, and documents

C707S798000

Reexamination Certificate

active

07836028

ABSTRACT:
A versioned relational database system (VRDBS) in which versions of data contained in a relational database system are accessed by means of workspaces. Metadata in the VRDBS permits a workspace to have multiple parents. The multi-parented VRDBS performs operations including specifying that a workspace be made an additional parent of another workspace or that an additional parent be removed as a parent of the other workspace. The fact that a workspace may have multiple parents affects the manner in which merge and refresh operations are performed and the manner in which system-enforced constraints such as primary key constraints, unique key constraints, and referential integrity constraints are handled. The metadata for the VRDBMS includes a multi-parent graph for each workspace that has multiple parents. The multi-parent graph is used in the performance of the merge and refresh operations and in determining constraint violations.

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