Oracle Data Guard: Difference between revisions

Revision as of 07:11, 20 April 2012

Revision as of 04:21, 27 April 2012

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== Disadvantages ==

Version 11.2.0.1.0 and earlier is somewhat unreliable and buggy inwhen itsdealing physicalwith physical-standby incarnationoperations.{{fact}}

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.

Data Guard restricts use to like platform and to like Oracle RDBMS versions. <ref name="Oracle Database Options"/>

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

<ref name="Oracle Active data Guard"/>

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

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