Oracle Data Guard: Difference between revisions

Revision as of 04:21, 27 April 2012

Revision as of 04:41, 27 April 2012

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== Disadvantages ==

Version 11.2.0.1.0 and earlier is somewhat unreliable and buggy when dealing with physical-standby operations.{{fact|date=April 2012}}

If the network link connecting primary and standby is over-subscribed, the redo logs are not applied in chronological order, which can result in large gaps appearing in the available redo at the standby. Such a condition results in the standby being behind the primary.

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Active Data Guard, an added-cost option bundled within "Enterprise Edition" of the version 11 [[Oracle RDBMS]], allows purely read-only access.<ref name="Oracle Active data Guard"/>

Substantial cost-savings are possible using Oracle Standard Edition (SE), Oracle Standard Edition One (SE1) or even Oracle Express (XE) with use of third-party products{{which?|date=April 2012}} to provide [[high availability]] for a database system.

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