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I have a SP2010 server farm but need to reinstall sp as I never set a sql alias.

If I do this, how do I restore the original farm/central admin and admin content db's?

I have the above DB's, web app db's, and user profile db's.

Also, I installed sharepoint 2010 sp1 + june cu. Does the uninstall wipe out the june cu?

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I think its a bit extreme looking to do a reinstall, just setup the SQL alias as you intend to do and you should be able to get away with a renameserver operation

stsadm -o renameserver -oldservername "OLD_SQL_INSTANCE" -newservername "SQL_ALIASNAME"

Further info here

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