Sql server 2005 SQL中的性能问题

嗨，朋友们，我有大麻烦了

我有一个疑问，执行过程大约需要20分钟。450亿美元的记录

这就是问题所在

  SELECT 
     a.cmddefinitionid,

     b.cmdinstanceid,

     b.mobileid,

     d.phonenumber,

     d.hardwareid,

     d.smsemail,

     a.cmdid,

     c.cmdname,

     c.cmdxmldesc,

     a.eventflag,

     a.recurrenceflag,

     a.paramflag,

     a.filename,

     a.paramname,

     a.VALUE,

     a.meterflag,

     a.gosilentflag,

     a.regurl,

     b.scheduleddate,

   --  e.TxnTypeID, -- Added 



    e.TxnID,-- Added

    e.StatusMsg,-- Added

    b.LastModified as TimeCreated,-- Added newly

    d.PanelistID -- Added newly

FROM   

 ( select CmdInstanceID, TxnTypeID, TxnID, StatusMsg

              from  ODM_TDCS.dbo.CMD_TXN

              where TxnTypeID < 3 

              and TxnID IN (

              select max(TxnID)

              from ODM_TDCS.dbo.CMD_TXN                 

              group by CmdInstanceID)

  ) AS e, 

  dbo.cmd_definition AS a, 
  dbo.cmd_instance AS b, 
  dbo.lu_cmd AS c,
  dbo.lu_mobile AS d
  WHERE  
  a.cmddefinitionid = b.cmddefinitionid 
  and 
  a.cmdid = c.cmdid and b.mobileid = d.mobileid and 
  b.cmdtypeid = 2 AND
  b.scheduleddate > Getdate() - 2 AND
  b.CmdInstanceID = e.CmdInstanceID

现在，除此之外：

select CmdInstanceID, TxnTypeID, TxnID, StatusMsg
            from  ODM_TDCS.dbo.CMD_TXN
            where TxnTypeID < 3 
            and TxnID IN (
            select max(TxnID)
            from ODM_TDCS.dbo.CMD_TXN           
            group by CmdInstanceID)

这需要5分钟以上的时间，但如果我删除此条件，查询将在中执行

0.17秒

有什么帮助或建议吗？？？

试试这个

挑选 a、 cmddefinitionid

 b.cmdinstanceid,

 b.mobileid,

 d.phonenumber,

 d.hardwareid,

 d.smsemail,

 a.cmdid,

 c.cmdname,

 c.cmdxmldesc,

 a.eventflag,

 a.recurrenceflag,

 a.paramflag,

 a.filename,

 a.paramname,

 a.VALUE,

 a.meterflag,

 a.gosilentflag,

 a.regurl,

 b.scheduleddate,

-e.TxnTypeID，-添加

e.TxnID,-- Added

e.StatusMsg,-- Added

b.LastModified as TimeCreated,-- Added newly

d.PanelistID -- Added newly

FROM   

 (Select * from (
select CmdInstanceID, TxnTypeID, TxnID, StatusMsg, 
ROW_NUMBER() over (partition by CmdInstanceID order by TxnID desc ) as Row
from  ODM_TDCS.dbo.CMD_TXN
where TxnTypeID < 3 
)as t where e.Row = 1

) AS e, 

  dbo.cmd_definition AS a, 
  dbo.cmd_instance AS b, 
  dbo.lu_cmd AS c,
  dbo.lu_mobile AS d
  WHERE  
  a.cmddefinitionid = b.cmddefinitionid 
  and 
  a.cmdid = c.cmdid and b.mobileid = d.mobileid and 
  b.cmdtypeid = 2 AND
  b.scheduleddate > Getdate() - 2 AND
  b.CmdInstanceID = e.CmdInstanceID

刚刚使用了行数函数，这将避免移动ODM_TDCS.dbo.CMD_TXN 反复

---

祝你好运。

您好，但我是一名java开发人员，遇到了一些问题，请我检查是否可以解决。我很少接触sql。这是现有的sql，我在其中根据CmdInstanceID条件从ODM_TDCS.dbo.CMD_TXN中添加select CmdInstanceID、TxnTypeID、TxnID、STATUSSMSG，其中TxnTypeID<3，从ODM_TDCS.dbo.CMD_TXN组中添加TxnID。我还检查了CMD_TXN表索引已经存在于该表中。