Mysql – Lost connection to server executing ALTER TABLE

MySQLmysql-5.6

I'm trying to execute an ALTER TABLE statement in MySQL 5.6. Every time I run the query, it's creating a file with a name like #sql2-503-918bf.ibd taking full table size. I don't have enough disk space to run the query, because whenever I try to run it, another #sql… file will be created.

Query: 

ALTER TABLE kt_ticket_message 
    ADD COLUMN from_email varchar(255) NOT NULL COMMENT 'From email';

ERROR 2013 (HY000): Lost connection to MySQL server during query

Table size is 5 GB, database size is 6 GB.

These are parameters in the config file:

wait_timeout=30
interactive_timeout=60
max_allowed_packet=1M

Can I increase the timeout parameters?

Best Answer

Change specific timeouts value to 6000 it's available in all new versions of MySQL Workbench.

Open Edit → Preferences → SQL Editor → DBMS connection read time out (in seconds): 600

Changed the value to 6000.

Also unchecked limit rows as putting a limit in every time I want to search the whole data set gets tiresome.

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