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Error Code: 1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'Usage: mysqldump [OPTIONS] database [tables] OR mysqldump [OPTIONS] --databa' at line 1
报错： Error Code: 2006 - MySQL server has gone away
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mysql根据配置文件会限制server接受的数据包大小。
有时候大的插入和更新会受max_allowed_packet 参数限制，导致写入或者更新失败。
查看目前配置
SHOW VARIABLES LIKE '%max_allowed_packet%';
解决方法
SET GLOBAL max_allowed_packet=67108864;
SET GLOBAL net_buffer_length=10000;
注意：该值设置过小将导致单个记录超过限制后写入数据库失败，且后续记录写入也将失败