Symptoms
Consider the following scenario:
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You are using Microsoft SQL Server 2012 or SQL Server 2014 on a multi-core host.
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You keep the <gcServer enabled="true" /> default settings in the Dtexec.exe.config configuration file.
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You run the SQL Server Integration Services (SSIS) package that contains managed or custom tasks.
In this scenario, garbage collection is run in the default workstation mode, and the process takes a long time.
Cause
The issue occurs because the configuration is ignored if CLR is implicitly activated in the Dtexec.exe process. The garbage collector mode is the default workstation mode.
Resolution
The issue was first fixed in the following cumulative update of SQL Server.
Cumulative Update 1 for SQL Server 2012 SP2 /en-us/help/2976982
Cumulative Update 2 for SQL Server 2014 /en-us/help/2967546
Cumulative Update 10 for SQL Server 2012 SP1 /en-us/help/2954099
Each new cumulative update for SQL Server contains all the hotfixes and all the security fixes that were included with the previous cumulative update. Check out the latest cumulative updates for SQL Server:
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.