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I am using " Nginx " on server, version is v4.7 Stable , i am continuously getting errors, forced to clean Nginx Temp files every hours. attaching the error page. Hoe to fix this issue. also from phpmyadmin , export sql leads to sql error at forum.

That error means there isn't enough disk space.

http://www.cyberciti.biz/faq/mysql-error...-solution/

no , enough disk space there, around 100 GB

To be specific, not enough disk space on the partition /tmp/.