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Mysqlexplain 100712043803-phpapp01
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MySQL 执行计划解读 胡中泉
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通过执行计划可以了解什么
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TIPS : key_len
显示的值为索引字段的最大可能长度,并非实际使用长度,即 key_len 是根据表定义计算而得,不是通过表内检索出的
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TIPS :覆盖索引( Covering
Index ) MySQL 可以利用索引返回 select 列表中的字段,而不必根据索引再次读取数据文件 包含所有满足查询需要的数据的索引称为 覆盖索引 ( Covering Index ) 注意: 如果要使用覆盖索引,一定要注意 select 列表中只取出需要的列,不可 select * ,因为如果将所有字段一起做索引会导致索引文件过大,查询性能下降
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Q&A
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谢谢
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