还原大文件sql备份，数据库报错：
ERROR 2013 (HY000) at line 1490: Lost connection to MySQL server during query
解决办法，编辑/etc/my.cnf 修改：
max_allowed_packet = 500M //默认比较小
保存重启。
ERROR 1153 (08S01) at line 57: Got a packet bigger than ‘max_allowed_packet’ //同样解决办法
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