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

It appears that your query is returning a large intermediate result set requiring the creation of a temporary table and that the configured location for mysql temporary disk tables (/tmp) is not large enough for the resulting temporary table.

You could try increasing the tmpfs partition size by remounting it:

mount -t tmpfs -o remount,size=1G tmpfs /tmp

You can make this change permanent by editing /etc/fstab

If you are unable to do this you could try changing the location of disk temporary tables by editing the "tmpdir" entry in your my.cnf file (or add it if it is not already there). Remember that the directory you choose should be writable by the mysql user

You could also try preventing the creation of an on disk temporary table by increasing the values for the mysql configuration options:

tmp_table_size
max_heap_table_size

to larger values. You will need to increase both of the above parameters

Example:

set global tmp_table_size = 1G;
set global max_heap_table_size = 1G;