文章讲述了尝试向表添加新列时遇到的errorcode:2013错误，原因是在30秒内与MySQL服务器连接丢失。解决方案是关闭所有后端服务器，确保数据库未被其他人使用。
I try to add new column to table, but I got a error called 'error code: 2013. lost connection to mysql server during query 30.000 sec'
solution: shutdown all of back end server(some thing connected to the database, key poin is make sure database is not by using from some one else)
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