Mysql查询优化随笔记录
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select SQL_CALC_FOUND_ROWS * from (select * from oses_vehdata201606 union all select * from oses_vehdata201605) t where 1=1 and t.Check_Time between \'2016-06-23 00:00:00\' and \'2016-06-23 23:59:59\' order by Check_Time desc
结果：45.66 s 、36.5s
select SQL_CALC_FOUND_ROWS * from (select * from oses_vehdata201606) t where 1=1 and t.Check_Time between \'2016-06-23 00:00:00\' and \'2016-06-23 23:59:59\' order by Check_Time desc
结果：8s、9s
select SQL_CALC_FOUND_ROWS * from (select * from oses_vehdata201605) t where 1=1 and t.Check_Time between \'2016-06-23 00:00:00\' and \'2016-06-23 23:59:59\' order by Check_Time desc
结果：7s
select SQL_CALC_FOUND_ROWS * from oses_vehdata201606 t where 1=1 and t.Check_Time between \'2016-06-23 00:00:00\' and \'2016-06-23 23:59:59\' order by Check_Time desc
结果：0.176s、0.052
数据库优化博客http://www.ihref.com/read-16422.html
MySQL索引和查询优化
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