I meet this error too when I run a wordpress on my Fedora system.
I googled it, and find a way to fix this.
Maybe this will help you too.
-
check mysql config : my.cnf
cat /etc/my.cnf | grep tmpdirI can’t see anything in my
my.cnf -
add
tmpdir=/tmptomy.cnfunder[mysqld] -
restart web/app and mysql server
/etc/init.d/mysqld restart