Monday, June 30, 2014

Unable to remove SQL Server 2008 after removing from cluster

I was unable to uninstall SQL Server after it was removed from Failover Cluster Manager. It was logging below error in application log:

Product: Microsoft SQL Server 2008 Database Engine Services — Error 25012. There was an error attempting to remove the configuration of the product which prevents any other action from occuring. The current configuration of the product is being cancelled as a result.

I had followed below steps to uninstall SQL Server:

1. Open Registry Editor (Start -> run -> type regedit)

2. Navigate to the following key:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft SQL Server\MSSQL10.MSSQLSERVER\ClusterState\SQL_Engine_Core_Inst

3. Change the value of this “SQL_Engine_Core_Inst” key from 1 to 0.

4. Uninstall as normal through Programs and Features

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