From version 2012, SQL Server has a HA DR solutions, similar to Oracle (Active) Data Guard. Here is some (I would say Microsoft sponsored - oriented) comparison of these two solutions.
http://joedantoni.wordpress.com/2012/03/29/alwayson-versus-active-data-guard-a-value-proposition/
Also, one of the articles which describes complexity of Oracle RAC installation (team I have been working in has done it with Oracle 10g - so I could say that is correctly written - installing RAC on 10g was a nightmare) is
http://download.microsoft.com/download/C/D/C/CDCA80B2-FD63-49C5-AC66-8E3A179E31F7/SQL_Server_2012_Why_Oracle_RAC_Might_Not_Be_Suitable_For_You_Apr2012.pdf
and inside that document there is a link to the Oracle RAC installation overview
http://www.linxcel.co.uk/Whitepapers/Real-World%20Challenges%20for%20Oracle%20RAC%20Implementation-Issue%201.pdf
I am not preaching not for SQL Server nor for Oracle. Although these two documents are describing complexity of Oracle RAC installation and usage, if we are looking on the Oracle RAC not only as a DR solution but also as a platform with which You can scale up, than we could tell that Microsoft does not have that solution.
http://joedantoni.wordpress.com/2012/03/29/alwayson-versus-active-data-guard-a-value-proposition/
Also, one of the articles which describes complexity of Oracle RAC installation (team I have been working in has done it with Oracle 10g - so I could say that is correctly written - installing RAC on 10g was a nightmare) is
http://download.microsoft.com/download/C/D/C/CDCA80B2-FD63-49C5-AC66-8E3A179E31F7/SQL_Server_2012_Why_Oracle_RAC_Might_Not_Be_Suitable_For_You_Apr2012.pdf
and inside that document there is a link to the Oracle RAC installation overview
http://www.linxcel.co.uk/Whitepapers/Real-World%20Challenges%20for%20Oracle%20RAC%20Implementation-Issue%201.pdf
I am not preaching not for SQL Server nor for Oracle. Although these two documents are describing complexity of Oracle RAC installation and usage, if we are looking on the Oracle RAC not only as a DR solution but also as a platform with which You can scale up, than we could tell that Microsoft does not have that solution.
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