-更新备份端remoteemp update remoteemp set sal=:new.sal where empno=:new.empno

--更新备份端remoteemp update remoteemp set sal=:new.sal where empno=:new.empno;
数据的备份和同步


在主数据库上，给员工涨工资，新的工资拷贝到备份端


create or replace trigger syncsal
after update
on emp
begin


    --更新备份端remoteemp
    update remoteemp set sal=:new.sal where empno=:new.empno;


end;
/