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This packet data stream contains a client trace activity ID intended to be used by the server for debugging purposes, to allow correlating the server's processing of the request with the client request.
A client MUST NOT send a Trace Activity header when the negotiated TDS major version is less than 7.4. If the negotiated TDS major version is less than TDS 7.4 and the server receives a Trace Activity header token, the server MUST reject the request with a TDS protocol error.
Stream-Specific Rules:
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GUID_ActivityID = 16BYTE ; client application activity id ; used for debugging purposes ActivitySequence = ULONG ; client application activity sequence ; used for debugging purposes ActivityId = GUID_ActivityID ActivitySequence
Stream Definition:
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HeaderData = ActivityId