经过测试：
数据库设计时不一定要设计得很大容量，只要适合就行。
举例：
当一个姓名的列只需要6个字符，如果你放50个字符，如果数据在10万以后都不会觉得，当数据量超过20万的时候，你会明显感觉到数据搜索结果变慢。
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