Schema evolution in replication

Details Schema evolution in replication Schema evolution in replication

2007-01-09

2007-01-09

Shah, Sanjiv (Department: 2624)

Data processing: presentation processing of document, operator i

Presentation processing of document

Layout

C715S252000, C707S793000

Reexamination Certificate

active

09321594

ABSTRACT:
Schema evolution involves defining flavored object groups. Specifically, related collections of replicated tables and other database objects, which are defined as belonging to an object group, are given different “flavors.” A flavor describes different subsets of the objects and even different subsets of the columns in the master tables. In one embodiment, when one site in a distributed database system propagates changes to a replicated database object, the current flavor for the site is also transmitted, so that the destination site can make the necessary adjustments in the uploaded changes by dropping the values for obsolete columns and using default values for new columns.

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