要查看跟踪数据，必须转储缓冲区并进行格式化。
To examine the trace data, you must snap or dump and then format the buffers. The snapping of the buffers occurs automatically in any of the following scenarios.
例如，如果某个线程没有被调度，当转储缓冲区时它的跟踪信息仍然是可用的。
For example, if one particular thread is not being dispatched, its trace information is still available when the buffers are dumped or snapped.
收集选项包括打开或关闭跟踪；指定跟踪缓冲区大小；指定或更改跟踪选项；转储跟踪信息；以及清除跟踪缓冲区。
Collection options include turning a trace on or off; specifying the trace buffer size; specifying or changing trace options; dumping a trace; and clearing the trace buffer.
清单4和清单5显示了对循环缓冲区写入数据并且将其内容转储到文件的示例。
Listing 4 and Listing 5 show samples of writing the data to a ring buffer and dumping its contents to file.
一个非常好的做法是在循环缓冲器中维护最近几条消息的历史记录，当错误情况出现时，可以转储循环缓冲器。
One method that works very well is to maintain a history of the last few messages in a circular buffer that can then be dumped when an error condition occurs.
如果是在跟踪共享内存，跟踪缓冲区的大小将控制转储文件的大小。
If you are tracing to Shared memory, the size of the trace buffer controls the size of the dump file.
一旦接收到了转储数据的信号，将使用 is_dumping全局变量禁止其他的线程更改该缓冲区的内容。
The is_dumping global variable is used to stop other threads from changing the contents of the buffer once a signal has been received to dump data.
readfile 函数将把文件或Web页面的全部内容转储到默认的输出缓冲区。
The readfile function dumps the entire contents of a file or Web page to the default output buffer.
与预期一样，转储文件(dmp)大小约为8MB，跟db 2trc命令中指定的缓冲区大小相符。
As expected, the dump file (DMP) is approximately 8 MB in size, corresponding to the trace buffer size that was specified on the db2trc command.
与预期一样，转储文件(dmp)大小约为8MB，跟db 2trc命令中指定的缓冲区大小相符。
As expected, the dump file (DMP) is approximately 8 MB in size, corresponding to the trace buffer size that was specified on the db2trc command.
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