The SQL Activity Trace can be scheduled in advance or run on demand.
SQL活动跟踪可以预先排定，也可以随需运行。
For more information about user-defined activity trace, please see the Extending Tracing sample.
有关用户定义的活动跟踪的更多信息，请参见扩展跟踪示例。
For more information about user-defined activity trace, please see the Extending Tracing sample.
有关用户定义的活动跟踪的更多信息，请参见扩展跟踪示例。
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