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Frequently Asked Questions

The following sections outline some of the most frequently asked questions when using the Historian OLE DB provider. These questions include:

How Are Historian Calculation Modes and SQL Aggregate Functions Different?
How Are the ihTrend and ihRawData Tables Different?
Can I Run Multiple Applications Using the OLE DB provider?
Can I Retrieve Data from Multiple Servers?
What Is a Session?
How Do the > and >= Operators Work With Timestamps?
How Do I Throttle Query Results?
When Should I Use Excel Instead of the Historian Excel Add-In?
Why Is the Raw Sample at the Start Time Not Returned?
What Username and Password Are Used if Not Specified in the Connect String?
What Is an Array Tag?
What Is a User-Defined Type?
What Is Not Supported?