这将作为前台进程启动 MongoDB 数据库服务器。
This will start the MongoDB database server as a foreground process.
在测试阶段，将触发器监控器作为前台进程运行更方便，因为所有诊断消息将在命令会话窗口中可见。
It is much more convenient during the testing phase to run the trigger monitor as a foreground process because all of the diagnostic messages will be visible in the command session window.
一般而言，任何时刻前台进程都是为数不多的，只有作为最后的策略——当内存不足以维持它们同时运行时——才会被终止。
Generally, only a few foreground processes exist at any given time. They are killed only as a last resort-if memory is so low that they cannot all continue to run.
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