较大的日志文件很难使用，这是因为它们需要过滤大量的噪声才能找到有用的信号。

A large log file is difficult to use because you need to filter out a lot of noise to find the useful signal.

youdao

CPU负荷增长尽管(写)事务量没有变写日志个数没有变日志文件同步的往返信号传输时间就会延长。

When the CPU load goes up, the time taken for a log file sync round trip can increase even when the number of log file syncs and the volume of redo log generated doesn't change.

youdao

这个函数最后将获取和释放执行控制台信号，并将下一条日志消息发送到控制台(在release_console_sem中执行)。

At the end of this function, a gratuitous acquisition and release of the console semaphore is performed that emits the next log message to the console (performed within release_console_sem).

youdao