KB4089324 - FIX: Error 15665 when you call sp_set_session_context repeatedly with null key value in SQL Server 2016 and 2017

Applies To
SQL Server 2016 Service Pack 1 SQL Server 2016 Developer - duplicate (do not use) SQL Server 2016 Enterprise - duplicate (do not use) SQL Server 2016 Enterprise Core - duplicate (do not use) SQL Server 2016 Standard - duplicate (do not use) SQL Server 2017 Developer SQL Server 2017 Enterprise SQL Server 2017 Enterprise Core

Symptoms

Assume that you are using Microsoft SQL Server 2016 and 2017. When you run the sp_set_session_context stored procedure repeatedly (for example, more than 10 times) to set the KEY value parameter with a NULL value, you may receive an error message that resembles the following:

Note

Msg 15665, Level 16, State 1, Procedure sp_set_session_context, Line LineNumber [Batch Start Line LineNumber ]
The value was not set for key 'KeyName' because the total size of keys and values in the session context would exceed the 1 MB limit.

Resolution

This issue is fixed in the following cumulative update for SQL Server:

Cumulative Update 6 for SQL Server 2017

Cumulative update 8 for SQL Server 2016 SP1

About cumulative updates for 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. Check out the latest cumulative updates for SQL Server:

Latest cumulative update for SQL Server 2017
        
        Latest cumulative update for SQL Server 2016

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 that Microsoft uses to describe software updates.