问题：

HGMIGV4.4.1 工具，迁移mysql到V9.0.5 MySQL模式报错。

Packet for query is too large (4,462,199 > 4,194,304). You can change this value on the server by setting the ‘max_allowed_packet’ variable. 执行Insert写入行数据异常-1

解决：

V9.0.5数据库，登录5866端口修改数据库参数解决。

alter system set max_allowed_packet TO 1073741824  ; 
select pg_reload_conf(); 
show max_allowed_packet ;