mysql全表扫描
[英]full table scan in mysql
问题描述
select *from REPT_AIR_PRY_HY1 RAP where (RAP.DATE_OF_ISSUE) BETWEEN "2017-10-01" AND DATE_ADD("2017-10-31", INTERVAL 1 DAY)
the explain plan of this query gives me 337243 but data s between these dates is only 55209 and there is even index is created on column DATE_OF_ISSUE .
这个查询的解释计划给了我337243但这些日期之间的数据只有55209并且甚至在列 DATE_OF_ISSUE 上创建了索引。 So, why it is scanning the whole table?那么，为什么要扫描整个表呢？ thanks in advance提前致谢
1 个解决方案
解决方案1
0 2018-03-03 01:55:50
Some possibilities:一些可能性：
- The optimizer thinks (correctly or incorrectly) that a non-trivial percentage of the table would be needed.优化器认为（正确或错误地）需要表的非平凡百分比。 How many rows in the table?表中有多少行？
- You are using MyISAM;您正在使用 MyISAM； switch to InnoDB.切换到 InnoDB。
- For some reason, the 'statistics' are stale.出于某种原因，“统计数据”已经过时。 Do
ANALYZE TABLE.做ANALYZE TABLE。
To discuss further, please provide SHOW CREATE TABLE .要进一步讨论，请提供SHOW CREATE TABLE 。
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