mysql索引使用率监控简析_MySQL
bitsCN.com
mysql索引使用率监控简析 show status like ‘Handler_read%’; 
Handler_read_first 代表读取索引头的次数，如果这个值很高，说明全索引扫描很多。Handler_read_key代表一个索引被使用的次数，如果我们新增加一个索引，可以查看Handler_read_key是否有增加，如果有增加，说明sql用到索引。 Handler_read_next 代表读取索引的下列，一般发生range scan。Handler_read_prev 代表读取索引的上列，一般发生在ORDER BY … DESC。Handler_read_rnd 代表在固定位置读取行，如果这个值很高，说明对大量结果集进行了排序、进行了全表扫描、关联查询没有用到合适的KEY。Handler_read_rnd_next 代表进行了很多表扫描，查询性能低下。 作者 gzh0222 bitsCN.com
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