进行多个联接时，tmp表的MySQL错误密钥文件 [英] MySQL incorrect key file for tmp table when making multiple joins

问题描述

我通常不会来这里寻求帮助，但是对此我感到非常沮丧，我希望有人以前遇到过它.

I don't come here for help often but I am pretty frustrated by this and I am hoping someone has encountered it before.

每当我尝试使用多个联接从表中获取记录时，都会出现此错误:

Whenever I try to fetch records from a table using more than one join I get this error:

#126 - Incorrect key file for table '/tmp/#sql_64d_0.MYI'; try to repair it

因此此查询将产生错误:

So this query will produce the error:

SELECT * FROM `core_username`
INNER JOIN `core_person` ON (`core_username`.`person_id` = `core_person`.`id`)
INNER JOIN `core_site` ON (`core_username`.`site_id` = `core_site`.`id`)
ORDER BY `core_username`.`name` ASC LIMIT 1

但是这个不会:

SELECT * FROM `core_username`
INNER JOIN `core_person` ON (`core_username`.`person_id` = `core_person`.`id`)
ORDER BY `core_username`.`name` ASC LIMIT 1

这个也不会:

SELECT * FROM `core_username`
INNER JOIN `core_site` ON (`core_username`.`site_id` = `core_site`.`id`)
ORDER BY `core_username`.`name` ASC LIMIT 1

可能是什么原因造成的?我真的不知道如何修复tmp表，但是我真的不认为这是问题所在，因为每次都是新的tmp表.用户名表相当大(目前有233,718条记录)，但我怀疑这与它有关.

What could be causing this? I don't really know how to go about repairing a tmp table but I don't really think that's the problem as it is a new tmp table every time. The username table is fairly large (233,718 records right now) but I doubt that has anything to do with it.

任何帮助将不胜感激.

更新:经过进一步测试，看来该错误仅在我尝试订购结果时发生.也就是说，此查询将给我我期望的结果:

UPDATE: After some further testing, it appears that the error only happens when I try to order the results. That is, this query will give me what I expect:

SELECT * FROM `core_username`
INNER JOIN `core_person` ON (`core_username`.`person_id` = `core_person`.`id`)
INNER JOIN `core_site` ON (`core_username`.`site_id` = `core_site`.`id`)
LIMIT 1

但是如果我添加:

ORDER BY `core_username`.`name` ASC

错误被触发.这仅在我当前正在使用的特定Web服务器上发生.如果我下载数据库并在本地主机和其他服务器上尝试相同的操作，它将运行良好. MySQL版本是5.0.77.

The error is triggered. This is only happening on the specific webserver I am currently using. If I download the database and try the same thing on my localhost as well as other servers it runs fine. The MySQL version is 5.0.77.

知道这一点，我相当有信心正在发生的事情是正在创建的tmp表太大而MySQL阻塞了

Knowing this I am fairly confident that what is happening is that the tmp table being created is way too big and MySQL chokes as described in this blog post. I am still not sure what the solution would be, though...

推荐答案

有时临时表会发生此错误:

Sometimes when this error happens with temp tables:

#126 - Incorrect key file for table '/tmp/#sql_64d_0.MYI'; try to repair it

可能是因为/tmp文件夹空间不足.在某些Linux安装中，/tmp位于其自己的分区中，并且没有太多空间-大的MySQL查询将填满它.

It can be because the /tmp folder is running out of space. On some Linux installations, /tmp is in its own partition and does not have much space - big MySQL queries will fill it up.

您可以使用df -h检查\tmp是否在其自己的分区中以及为其分配了多少空间.

You can use df -h to check whether \tmp is in its own partition, and how much space is allocated to it.

如果它位于自己的分区中并且空间不足，则可以:

If it is in its own partition and short of space, you can either:

(a)修改/tmp，使其分区具有更大的空间(通过重新分配或将其移动到主分区中，例如不同的临时文件夹在另一个分区上，例如/var/tmp

(a) modify /tmp so that its parition has more space (either by reallocating or moving it to the main partition - e.g. see here)
(b) changing MySql config so that it uses a different temp folder on a different partition, e.g. /var/tmp

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