April 1999
Intermediate to advanced
552 pages
15h 39m
English
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Chapter 12. Multi-Master Replication
Multi-master replication, also known as advanced replication orsymmetric replication, allows you to maintain multiple sets of identical data at various sites; Oracle can automatically synchronize all DDL and DML changes. Obviously, this functionality comes at the expense of additional planning and administrative tasks and introduces a new level of sophistication to the environment. This chapter describes how to create and maintain a replicated environment and how to assess its health.
Concepts and Terminology
As you embark down the road ofreplication, you will encounter several phrases repeatedly; these include:
Deferred transaction
Replication group
Quiescence
Master definition site
Master site
Replication support
Conflict
Propagation latency
Instantiation
The following sections briefly describe what these phrases mean.
Deferred Transaction
A deferred transaction is a transaction that is queued for delivery to one or more remote databases. If you use multi-master replication with asynchronous propagation, Oracle creates deferred transactions for all local DML activity against the replicated tables.
Replication Group
A replication groupis a collection of one or more replicated objects (typically tables) that are administrated together. Very generally speaking, the objects in a given replication group are logically related; for example, they are often the set of objects that a given application uses. Prior to Oracle Version 7.3, the concept of a replication ...
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