System and method for physically versioning data in a main memor

Details System and method for physically versioning data in a main memor System and method for physically versioning data in a main memor

1998-01-05

2000-09-19

Black, Thomas G.

Data processing: database and file management or data structures

Database design

Data structure types

707204, 707100, G06F 1730

Patent

active

061226459

ABSTRACT:
For use with a database of data records organized into components, the database stored in a memory, a processing system for, and method of, physically versioning the database. In one embodiment, the processing system includes: (1) a component copier that creates a physical copy of an original component to be affected by an update transaction to be applied to the database, and that causes pointers in nodes of the physical copy to point to other nodes in the physical copy, (2) a data updater, associated with the component copier, that applies the update transaction to the physical copy to create therefrom a new physical version, the original component remaining unaffected by the update transaction and (3) a pointer updater, associated with the data updated, that employs an atomic word write to revise a component pointer, associated with the database, to cause the pointer to point to the new physical version.

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