SQL Server:显示超时已过期的过程

我有一个程序，在这个程序中，我试图显示每一个科目的出勤率。问题是我正在使用旋转来完成所需的工作。我面临的问题是，在本地主机上，过程在本地数据库上运行正常，但在服务器上，我遇到以下错误：

超时已过期。操作完成前已过超时时间，或者服务器没有响应

我的程序如下所示：

ALTER PROCEDURE [dbo].[prStudentLoadFullAttendance]  
    @SemID int ,
    @CourseID int
AS
BEGIN
    -- SET NOCOUNT ON added to prevent extra result sets from
    -- interfering with SELECT statements.
    SET NOCOUNT ON;

    -- Insert statements for procedure here
    Declare @S  nvarchar(1024)
 Declare @Q nvarchar(Max)


set @S='' 

---code for semester wise attendance
 if(@SemID<>0)
 begin

Select   @S=@S+a.[Column] +',' from
(SELECT  distinct   ISNULL( dbo.tbSubjects.SubCode,'NoColumnName') as [Column] FROM         dbo.tbAttendance INNER JOIN
                      dbo.tbAttendanceMaster ON dbo.tbAttendance.MasterAID = dbo.tbAttendanceMaster.AtdID INNER JOIN
                      dbo.tbStudent ON dbo.tbAttendance.StID = dbo.tbStudent.StudentID INNER JOIN
                      dbo.tbSubjects ON dbo.tbAttendanceMaster.SubID = dbo.tbSubjects.SubID LEFT OUTER JOIN
                      dbo.tbSemester ON dbo.tbSubjects.SemID = dbo.tbSemester.SemID
                      where tbSemester.SemID=@SemID ) as a

 set @S=LEFT(@S,LEN(@S)-1)
 print @S

 set @Q='select Name,'+@S+',ODC'+',Percentage'+' from (SELECT  distinct tbStudent.Name,   dbo.tbSubjects.SubCode,
 dbo.fnAttendanceView(dbo.tbAttendanceMaster.SubID,dbo.tbStudent.StudentID) AS Total ,dbo.fnodc(dbo.tbStudent.StudentID) as ODC,
 left(dbo.fnCountTotalAttendance(dbo.tbStudent.StudentID),5) as Percentage

FROM         dbo.tbAttendance INNER JOIN
                      dbo.tbAttendanceMaster ON dbo.tbAttendance.MasterAID = dbo.tbAttendanceMaster.AtdID INNER JOIN
                      dbo.tbStudent ON dbo.tbAttendance.StID = dbo.tbStudent.StudentID INNER JOIN
                      dbo.tbSubjects ON dbo.tbAttendanceMaster.SubID = dbo.tbSubjects.SubID LEFT OUTER JOIN
                      dbo.tbSemester ON dbo.tbSubjects.SemID = dbo.tbSemester.SemID 
                      where tbSemester.SemID='+Cast(@SemID as nvarchar(10))+'
                      ) sq
                      pivot(min(Total)   for SubCode IN('+@S+') ) as pt

'
 Execute sp_Executesql @Q
end

---code for course wise attendance
else
 begin

Select   @S=@S+a.[Column] +',' from
(SELECT DISTINCT ISNULL(dbo.tbSubjects.SubCode, 'NoColumnName') AS [Column]
FROM         dbo.tbAttendance INNER JOIN
                      dbo.tbAttendanceMaster ON dbo.tbAttendance.MasterAID = dbo.tbAttendanceMaster.AtdID INNER JOIN
                      dbo.tbStudent ON dbo.tbAttendance.StID = dbo.tbStudent.StudentID INNER JOIN
                      dbo.tbSubjects ON dbo.tbAttendanceMaster.SubID = dbo.tbSubjects.SubID INNER JOIN
                      dbo.tbCourse ON dbo.tbSubjects.Course = dbo.tbCourse.CourseID
                      where tbCourse.CourseID=@CourseID ) as a


set @S=LEFT(@S,LEN(@S)-1)
 print @S
set @Q='select Name,'+@S+',ODC'+',Percentage'+' from (SELECT DISTINCT 
                      dbo.tbStudent.Name, dbo.tbSubjects.SubCode, dbo.fnAttendanceView(dbo.tbAttendanceMaster.SubID, dbo.tbStudent.StudentID) AS Total, dbo.fnOdc(dbo.tbStudent.StudentID) AS ODC, 
                      LEFT(dbo.fnCountTotalAttendance(dbo.tbStudent.StudentID), 5) AS Percentage, dbo.tbSubjects.Course
FROM         dbo.tbAttendance INNER JOIN
                      dbo.tbAttendanceMaster ON dbo.tbAttendance.MasterAID = dbo.tbAttendanceMaster.AtdID INNER JOIN
                      dbo.tbStudent ON dbo.tbAttendance.StID = dbo.tbStudent.StudentID INNER JOIN
                      dbo.tbSubjects ON dbo.tbAttendanceMaster.SubID = dbo.tbSubjects.SubID INNER JOIN
                      dbo.tbCourse ON dbo.tbSubjects.Course = dbo.tbCourse.CourseID
                      where dbo.tbCourse.CourseID='+Cast(@CourseID as nvarchar(10))+'
                      ) sq
                      pivot(min(Total)   for SubCode IN('+@S+') ) as pt
'
 Execute sp_Executesql @Q
end
END

---

在不了解更多关于这些表的信息的情况下，它们的结构是什么？其中存储了多少行？这些表上有什么索引？在没有看到执行计划的情况下-这是不可能回答的…为什么不使用内置的PIVOT？请看这些表使用的是默认索引方案。执行计划也是默认的，这是一个超时的简单过程。查询超时多长时间后？？SQL Server中没有默认索引。。。。。