解決mysql 數據庫在遷移或還原數據過程中出現的如下報錯：
ERROR 1231 (42000): Variable 'time_zone' can't be set to the value of 'NULL' ERROR 1231 (42000): Variable 'sql_mode' can't be set to the value of 'NULL' ERROR 1231 (42000): Variable 'foreign_key_checks' can't be set to the value of 'NULL' ERROR 1231 (42000): Variable 'unique_checks' can't be set to the value of 'NULL' ERROR 1231 (42000): Variable 'character_set_client' can't be set to the value of 'NULL' Query OK, 0 rows affected (0.00 sec) ERROR 1231 (42000): Variable 'collation_connection' can't be set to the value of 'NULL' ERROR 1231 (42000): Variable 'sql_notes' can't be set to the value of 'NULL'
解決辦法：
修改mysql配置文件:max_allowed_packet=1024M
重啓mysql：
# systemctl restart mysql.service