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。
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。
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。
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