Question

我的网页上有一个小搜索功能。

IF LEN(@firstName) < 1 OR @firstName IS NULL
set @firstName = '%'    


IF LEN(@lastName) < 1 OR @lastName IS NULL
set @lastName = '%'

IF LEN(@carrierId) < 1 OR @carrierId IS NULL
set @carrierId = '%'


IF LEN(@worksheetId) < 1 OR @worksheetId IS NULL
set @worksheetId = '%'  

SELECT TOP 1000 m.[Guid], m.WorksheetID, d.FirstName, d.LastName, m.VersionNum FROM Main m
INNER JOIN utl_Driver d ON m.DriverID = d.DriverID
    WHERE d.FirstName LIKE @firstName
    AND d.LastName LIKE @lastName
    AND d.CarrierID LIKE @carrierId
    AND m.WorksheetID LIKE @worksheetId
    AND m.Deleted = 0
    AND d.VersionNum = (SELECT MAX(VersionNum)
                            FROM Main B WHERE b.WorksheetID = m.WorksheetID)
    ORDER BY m.DateTimeStart DESC;

在SQL Server Management Studio中快速闪电，但在我的ASP.Net应用程序调用存储过程时表现奇怪。通过LastName搜索通常很快，但FirstName或WorksheetID超时。此外，删除'm.Deleted = 0'检查会使所有查询执行得非常快，但我显然需要检查。有什么建议吗？

Answer 1

此查询永远不会预先形成。你正在4个不同的领域进行表扫描。我也没有在查询中看到任何分页，这意味着返回所有结果。这将是大量数据的问题。

介绍webforms，现在你有了viewstate。网格/列表视图将整个结果集存储在viewstate中（即使您启用了客户端分页）。

这是我看到的3个主要瓶颈。 1.由于“喜欢”运算符导致查询性能不佳 2.结果集可能太大 3. webforms查看状态

Answer 2

请您尝试如下：感谢您的时间。

DECLARE @whereCondition NVARCHAR(1000)
SET @whereCondition = ' WHERE 1 = 1 '

IF @firstName <> '' AND @firstName IS NOT NULL
    SET @whereCondition = @whereCondition + ' AND d.FirstName LIKE  ''' + @firstName + ''''

IF @lastName <> '' AND @lastName IS NOT NULL
    SET @whereCondition = @whereCondition + ' AND  d.LastName LIKE  ''' + @lastName + ''''

IF @carrierId <> '' AND @carrierId<> 0 AND @carrierId IS NOT NULL
    SET @whereCondition = @whereCondition + ' AND  d.CarrierID LIKE  ''' + @carrierId + ''''

IF @worksheetId <> '' AND @worksheetId<> 0  AND @worksheetId IS NOT NULL
    SET @whereCondition = @whereCondition + ' AND  m.WorksheetID LIKE  ''' + @worksheetId + ''''

SET @whereCondition = @whereCondition + ' AND  m.Deleted = 0'
SET @whereCondition = @whereCondition + ' AND  d.VersionNum = (SELECT MAX(VersionNum)
                            FROM Main B WHERE b.WorksheetID = m.WorksheetID) '

EXEC('SELECT TOP 1000 m.[Guid], m.WorksheetID, d.FirstName, d.LastName, m.VersionNum FROM Main m
       INNER JOIN utl_Driver d ON m.DriverID = d.DriverID '
       + @whereCondition +
       ' ORDER BY m.DateTimeStart DESC; ' )

SQL搜索运行缓慢，仅在浏览器中运行

2 个答案: