SQL查询在ASP.NET中花费25秒加载页面

Question

如何提高页面加载速度以尽早获取数据？

select B.bdregno, B.srno, B.bdbillno, B.bdfees as bdfees, B.bdqty as bdqty,
       B.bdrcode as bdrcode, B.bdtno as bdtno, B.bdvdate as bdvdate, T.TNAME as TNAME 
from dbo.[test] T full outer join 
     dbo.[billdet] B 
     on T.TCODE = B.bdtcode 
where" + qr + " bdregno='" + hdfregno.Value + "' 
order by bdvdate asc, srno

查询在SQL Server中快速运行，但是在ASP.NET应用程序中，加载页面大约需要25秒。

Answer 1

首先，我怀疑您是否真的想要完全外部联接。我猜一个left join就足够了：

select B.bdregno, B.srno, B.bdbillno, B.bdfees, B.bdqt,
       B.bdrcode, B.bdtno, B.bdvdate, T.TNAME 
from dbo.[billdet] B left join
     dbo.[test] T 
     on T.TCODE = B.bdtcode 
where b.bdregno = ?  --'" + hdfregno.Value + "' 
order by b.bdvdate asc, srno

对于此查询，您希望在billdet(bdregno, bdtcode)上建立索引。引擎仍然需要做麦芽汁。

请注意，您应该将值作为参数传入，而不要查询字符串。