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Impact Of Unistalling AD on a Stand-Alone 2003 Server

Posted on 2008-06-25
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Last Modified: 2010-04-18
What impact will there be if AD was removed from a Stand-Alone server that is using the AD only for itself (no other servers or boxes are using AD on this box) and SQL 2005 was running on this server previous to the installation of AD? Will the box need to be rebuilt, and if so why.
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Question by:Robert Pollick
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Expert Comment

by:Christopher Martinez
ID: 21869740
At a high level, the directory database is deleted, all of the services required for Active Directory are stopped and removed, the local SAM database is created.

Pulled from Microsoft

2.5.12 Installing SQL Server 2005 on a Windows Domain Controller

Security Note:  
We recommend against running SQL Server 2005 on a domain controller.
 
It is possible to install SQL Server 2005 on a Windows domain controller; however, it cannot run on a Windows Server 2003 domain controller as Local Service or Network Service. SQL Server service accounts should run as Windows domain user accounts. It is also possible to install SQL Server service accounts to run as Local System, but this option is not recommended.

Do not change the role of the server after you install SQL Server 2005. For example, if you install SQL Server 2005 on a member server, do not use the Dcpromo tool to promote the server to a domain controller. Or, if you install SQL Server 2005 on a domain controller, do not use Dcpromo to demote the server to a member server. Changing the role of a server after you install SQL Server 2005 can result in loss of functionality and is not supported.
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Author Comment

by:Robert Pollick
ID: 21870020
So, if another DC was introduced with a different domain, the SQL instances on the box in question is pointed to this new domain, then the box in question were to be demoted, it is not known how SQL will react to this demotion of the DC where SQL is currently installed even though the security for SQL is pointing to this new domain. Am I completely understanding this correctly?
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Accepted Solution

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Christopher Martinez earned 2000 total points
ID: 21870229
You are correct. SQL doesnt like change. Modifying the DC can result in a loss of SQL functionality. Its unkown how it will react, just frowned upon by microsoft engineers. Sorry for the generality but its not always black and white with these things.
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Author Comment

by:Robert Pollick
ID: 21870301
I appreciate your assistance. Thank you.
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