If Open_tables is much lower than your table_cache setting, you have too many (some room to grow is never a bad thing, though).
如果Open _ tables比table_cache设置小很多，就说明该值太大了(不过有空间可以增长总不是什么坏事)。
Setting lamp: Offer certain brightness for whole room, foil atmosphere.
背景灯：为整个房间提供一定亮度，烘托气氛。
SETTING: Center Laboratory Room of Fenyang College of Shanxi University of Medical Science.
单位：山西医科大学汾阳学院中心实验室。
SETTING: Center Laboratory Room of Fenyang College of Shanxi University of Medical Science.
单位：山西医科大学汾阳学院中心实验室。
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