Error Code: 2013. Lost connection to MySQL server during query

Question

I got the Error Code: 2013. Lost connection to MySQL server during query error when I tried to add an index to a table using MySQL Workbench. I noticed als

Answer 1

check about

OOM on /var/log/messages ,
modify innodb_buffer_pool_size value ; when load data , use 50% of os mem ; 

Hope this helps