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MSSQLSERVER_32040

Topic Status: Some information in this topic is preview and subject to change in future releases. Preview information describes new features or changes to existing features in Microsoft SQL Server 2016 Community Technology Preview 2 (CTP2).

Product Name

SQL Server

Event ID

32040

Event Source

MSSQLSERVER

Component

SQLEngine

Symbolic Name

SQLErrorNum32040

Message Text

The alert for 'oldest unsent transaction' has been raised. The current value of '%d' surpasses the threshold '%d'.

This database mirroring event is issued on the principal server instance to indicate that the age of the oldest unsent transaction has reached a user-specified threshold value. Typically, this event occurs because the performance of the system has changed. Either the bandwidth between the two systems has decreased, or the load has increased.

The age of the oldest unsent transaction is a performance metric that can help you evaluate the potential for data loss as measured by the number of minutes of unsent transactions. This metric is especially relevant for high-performance mode sessions. However, this metric is also relevant for high-safety mode session when mirroring is paused or suspended because the partners become disconnected.

Check the loads on the principal and mirror server instances and their network connection for the cause.

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