每秒N条记录到数据库history表中.

思想：统计到history表中一秒中记录数，stamp为写入数据庫的系统时间。convert(varchar,stamp,20)，把系统时间转换为秒，SQL里的显示是微秒。在SQL里stamp最好加索引。增加查询速度。

SQL:
select top 100 convert(varchar,stamp,20) ,count(1) from history where stamp< getdate()-1 group by convert(varchar,stamp,20)

oracle:

select stamp,count(1) from history where stamp>SYSDATE-100 group by stamp order by count(1) desc