Symptoms
Consider the following scenario:
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You enable transparent data encryption (TDE) in SQL Server.
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You use asymmetric encryption keys to protect the backup of the SQL Server database.
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You store the asymmetric encryption keys in the SQL Server Extensible Key Management (EKM) provider.
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You restore the backup of the SQL Server database.
In this scenario, it may take a long time to complete the restore, due to unnecessary communications with the EKM provider.
Resolution
This issue is fixed in following cumulative updates
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Cumulative Update 8 for SQL Server 2016 SP1
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Cumulative Update 11 for SQL Server 2014 Service Pack 2.
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 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.
References
Learn about the terminology Microsoft uses to describe software updates.
