在两个RDS(postgres)特定模式中表同步

【以下的回答经过翻译处理】 找到了解决方案。解决方案是在完整加载前手动删除外键约束，并在迁移任务结束后重新创建它们。

一个简单的脚本用于删除外键约束（摘自 https://dba.stackexchange.com/a/97047）

create table if not exists dropped_foreign_keys (
        seq bigserial primary key,
        sql text
);

do $$ declare t record;
begin
    for t in select conrelid::regclass::varchar table_name, conname constraint_name,
            pg_catalog.pg_get_constraintdef(r.oid, true) constraint_definition
            from pg_catalog.pg_constraint r
            where r.contype = 'f'
            -- uncomment the below line for current schema only:
            -- and r.connamespace = (select n.oid from pg_namespace n where n.nspname = current_schema())
        loop

        insert into dropped_foreign_keys (sql) values (
            format('alter table %s add constraint %s %s',t.table_name, t.constraint_name, t.constraint_definition));

        execute format('alter table %s drop constraint %s', t.table_name, t.constraint_name);

    end loop;

    
end $$;

重新创建删除的外键约束

do $$ declare t record;
begin
    -- order by seq for easier troubleshooting when data does not satisfy FKs
    for t in select * from dropped_foreign_keys order by seq loop
        execute t.sql;
        delete from dropped_foreign_keys where seq = t.seq;
    end loop;
end $$;