用于具有多个连接的水果检查的 SQL Server 存储过程 - 超时

Question

存储过程因为太慢而超时，可能是因为它使用了outer full join

错误：

System.Data.SqlClient.SqlException (0x80131904)：超时。这 在操作完成之前经过的超时时间或 服务器没有响应。 ---> System.ComponentModel.Win32Exception (0x80004005): 等待操作超时 System.Data.SqlClient.SqlConnection.OnError（SqlException 异常， 布尔中断连接

根据我的研究，我认为增加超时可能会解决错误问题，但我也想减少执行时间，任何改进都会受到欢迎。如果需要，我会发布表格结构，但这会很多。另外我不确定增加超时是否是最好的解决方案

/* Stored procedure to get fruits checks that the user has access to*/
ALTER procedure [dbo].[Fruits_GetChecksForUser]
(
    @UserID VARCHAR(200),
    @CheckUrlFilter varchar(256)
)
AS

SELECT Distinct
    Fruits_Checks.*,
    ManagementCommittees.Title As CommitteeName,
    FruitCategories.ID As CategoryID,
    FruitCategories.Title As CategoryName,
    dbo.IsUserInGroup(@UserID, FruitCategories.FruitOfficerGroupID) AS IsUserFruitOfficer,
    dbo.IsUserInGroup(@UserID, Fruits_Checks.AllocatedGroup) AS IsUserCheckResponsible,
    Policies.CompanyID,
    Policies.ID As PolicyID

FROM Groups_UserAccess
INNER JOIN FruitCategories_GroupAccess ON FruitCategories_GroupAccess.GroupID = Groups_UserAccess.GroupID
INNER JOIN FruitCategories ON FruitCategories.ID = FruitCategories_GroupAccess.FruitCategoryID
INNER JOIN Policies ON Policies.ID = FruitCategories.PolicyID
LEFT JOIN Policies_AppSettings ON Policies_AppSettings.PolicyID = Policies.ID
LEFT JOIN Clients_AppSettings ON Clients_AppSettings.ID = Policies.CompanyID
FULL OUTER JOIN Fruits ON Fruits.CategoryID = FruitCategories.ID
INNER JOIN Fruits_Checks ON Fruits_Checks.FruitID = Fruits.ID
INNER JOIN ManagementCommittees on Fruits_Checks.CommitteeID = ManagementCommittees.ID

WHERE 
    Fruits.ID IS NOT NULL 
    AND Fruits_Checks.URL LIKE '%' + @CheckUrlFilter + '%' 

ORDER BY Fruits_Checks.EndDate

Answer 1

增加时间肯定不是解决办法。看起来不必要/可避免的完整外连接、不同的指令和可能的内联函数调用（也可以看看它们）会大大降低您的查询速度。 至少需要一个执行计划，才能为你提供更详细的答案。