MySQL/Writing file error (Errcode 28)

Question

I have the following error with one of our web applications -

Query3 failed: Error writing file \'/tmp/MY1fnqpm\' (Errcode: 28) ... INSERT MailList... (remo         


        

Answer 1

We have experienced similar issue, and the problem was MySQL used /tmp directory for its needs (it's default configuration). And /tmp was located on its own partition, that had too few space for big MySQL requests.

For more details take a look for this answer: https://stackoverflow.com/a/3716778/994302

Answer 2

This error occurs when you don't have enough space in the partition. Usually MYSQL uses /tmp on linux servers. This may happen with some queries because the lookup was either returning a lot of data, or possibly even just sifting through a lot of data creating big temp files.

Edit your /etc/mysql/my.cnf

tmpdir = /your/new/dir

e.g

tmpdir = /var/tmp

Should be allocated with more space than /tmp that is usually in it's own partition.

Answer 3

You can also try using this line if the other doesn't work:

du -sh /var/lib/mysql/database_Name

You may also want to check with your host and see how big they allow your databases to be.

Answer 4

Run the following code:

du -sh /var/log/mysql

Perhaps mysql binary logs filled the memory, If so, follow the removal of old logs and restart the server. Also add in my.cnf:

expire_logs_days = 3