如果该比率很高，则它可能表明您所定义的页清除程序太少了。
If this ratio is high, it may indicate that you have too few page cleaners defined.
如果没有配置页清除程序，则应用程序可能会遇到不时发生的“日志已满”情况。
If no page cleaners are configured, your applications may encounter periodic "log full" conditions.
为了尽可能好地进行页清除。
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