Frequently Asked Questions by customers, end-users, and integrators. Let us know if you have an unanswered question.
Trend history is running very slow from the database.
Make sure the date and time span is defined to return a subset of data instead of all of the data. You can also reindex the database in SQL Server to run faster. Reorganizing and Rebuilding Indexes https://msdn.microsoft.com/en-us/library/ms189858.aspx
