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• DBCC TRACEON. This may increase the number of sessions that have a NULL batch handle and therefore increase the amount of Text N/A batches.
  Workaround: You can add DBCC TRACEON 2861 in the starting parameter of the SQL Server instance (-T 2861).
• DBCC INPUTBUFFER (if needed by the internal collector logic). This may limit the ability the retrieve the statement/batch text when the system encounters some known bugs in SQL Server.
• Metrics for not responding transactions. You will get an error in Alerts.
• Show statistics and Show config views enabled in index/table entities in the Objects tab. They will stop working.
• Recommendations. This may limit to get recommendation for objects and statements.

For more information, see Initializing see Start and Use the Database Engine Tuning Advisor on the MSDN website.