STSADM PrepareToMove command and the Infrastructure Update
Must read if you have run or are use to running the STSADM preparetomove command when detaching/attaching content databases within or between farms and if the infrastructure update has been applied.
http://blogs.msdn.com/toddca/archive/2009/01/30/preparetomove-away-from-running-this-command.aspx
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