mysql导出数据错误解决办法

mysqldum导出大数据表错误
[root@Centos-6-99 itop]# mysqldump -u root -p --opt itop >/home/itop/itop-backup.sql
Enter password:
mysqldump: Error 2020: Got packet bigger than 'max_allowed_packet' bytes when dumping table attachment at row: 1

解决办法：增加mysqldump的 max_allowed_packet
[root@Centos-6-99 itop]# mysqldump -u root -p --max-allowed-packet=64943040 --opt itop >/home/itop/itop-backup.sql
Enter password:
[root@Centos-6-99 itop]# ls
databases.sql itop-backup.sql