MySQL数据库优化概述四_MySQL-Mysql Tutorial-php.cn

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MySQL数据库优化概述四_MySQL

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Jun 01, 2016 pm 01:59 PM

Database optimization

table type possible_keys key key_len ref rows Extra

tt    ALL    AssignedPC    NULL    NULL    NULL          3872 Using
             ClientID,                                        where
             ActualPC
et    eq_ref PRIMARY       PRIMARY 15      tt.ActualPC   1
et_1 eq_ref PRIMARY       PRIMARY 15      tt.AssignedPC 1
do    eq_ref PRIMARY       PRIMARY 15      tt.ClientID   1

　　请注意，EXPLAIN 结果中的 rows 字段的值也是MySQL的连接优化程序大致猜测的，请检查这个值跟真实值是否基本一致。如果不是，可以通过在 SELECT 语句中使用 STRAIGHT_JOIN 来取得更好的性能，同时可以试着在 FROM

　　分句中用不同的次序列出各个表

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