When you run queries in Microsoft SQL Server 2012 or SQL Server 2014, the queries may intermittently fail with a SHARING VIOLATION error on the CLR assembly Microsoft.SqlServer.Types.dll. Additionally, the following error message is logged in SQL Server Error log:

Error 6518, Severity 16, State 2
Could not open system assembly ''C:\Windows\assembly\GAC_MSIL\microsoft.sqlserver.types\\microsoft.sqlserver.types.dll'': 32(The process cannot access the file because it is being used by another process.).


The issue was first fixed in the following cumulative update of SQL Server:

Each new cumulative update for SQL Server contains all the hotfixes and all the security fixes that were included with the previous cumulative update. We recommend that you download and install the latest cumulative updates for SQL Server:


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

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