MySQL, Error 126: Incorrect key file for table

Question

I read the following question that has relevance, but the replies didn\'t satify me: MySQL: #126 - Incorrect key file for table

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The problem

When runn

Answer 1

If your /tmp mount on a linux filesystem is mounted as overflow, often sized at 1MB, ie

$ df -h
Filesystem      Size  Used Avail Use% Mounted on
udev            7.9G   12K  7.9G   1% /dev
tmpfs           1.6G  348K  1.6G   1% /run
/dev/xvda1      493G  6.9G  466G   2% /
none            4.0K     0  4.0K   0% /sys/fs/cgroup
none            5.0M     0  5.0M   0% /run/lock
none            7.9G     0  7.9G   0% /run/shm
none            100M     0  100M   0% /run/user
overflow        1.0M  4.0K 1020K   1% /tmp               <------

this is likely due to you not specifying /tmp as its own partition and your root filesystem filled up and /tmp was remounted as a fallback.

I ran into this issue after running out of space on an EC2 volume. Once I resized the volume, I ran into the /tmp overflow partition filling up while executing a complicated view.

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To fix this after you've cleared space/resized, just unmount the fallback and it should remount at its original point (generally your root partition):

sudo umount -l /tmp

_{Note: -l will lazily unmount the disk.}