MySQL incorrect key file for tmp table when making multiple joins

Question

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

Whenever I try to fetch records from a table

Answer 1

Check your MySQL tmpdir available space (/tmp in your case) while running the queries as it can eat hundreds of MBs when working with big tables. Something like this worked for me:

$ while true; do df -h /tmp; sleep .5; done