Question

我在MySQL（Sequel Pro）（6000 * 5,000,000）上执行了一个简单的连接查询，但它看起来无穷无尽，并且会永远运行。超过12个小时后，我取消了它。

create table westhamp_to_all_12449_crude_1
select rods_od_12449_crude_1.*, 12449_peak_extended.* from rods_od_12449_crude_1
inner join 12449_peak_extended
on rods_od_12449_crude_1.id=12449_peak_extended.prestigeid;

我发现该表已生成。表是对的吗？如果不对，为什么要生成一个？

由于

Answer 1

If you are using Engine=MyISAM, the table is generated as it goes. It is possibly incomplete.

If you are using Engine=InnoDB, I think (but am not sure) that it would not exist.

Please provide EXPLAIN select rods_od_12449_crude_1.*, 12449_peak_extended.* from rods_od_12449_crude_1 inner join 12449_peak_extended on rods_od_12449_crude_1.id=12449_peak_extended.prestigeid; so we can discuss the details.

Also, provide SHOW CREATE TABLE so we can check that you have an adequate index for that JOIN.

Sequel Pro（MySQL）执行连接查询（6000 * 5,000,000）

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