Question

我需要检查/重构一个以表格为目标的现有存储过程（10多万行）。存储过程签名不能轻易更改，如下所示。

存储过程采用由管道分隔的两个字符串，并使用SQL函数（SplitDelimitedVarChar）将字符串拆分为临时表，然后在实际的select中使用。 array 字符串中的字符串数量范围为1到数千。

DateValue和TimeValue列包含行中时间戳的int表示。

我的问题是，如果任何人有任何想法，如果这是一个好的（最好的？）解决方案，或者它可以做得更好。主要问题是它是否可以针对速度进行优化？

由于该表只能通过此存储过程访问，因此索引是非聚类的WHERE列，并包含所有SELECT列。

感谢您提出任何建议或指示。

CREATE PROCEDURE [dbo].[spdata_Get_Ana]
@beginTime INT,
@endTime INT,
@subscribers VARCHAR(MAX),
@exchanges VARCHAR(MAX) = '1:',
@beginDateValue int, 
@endDateValue int,
@target int = 1
AS  
BEGIN
SET NOCOUNT ON;

CREATE TABLE #exch (Item Varchar(20) COLLATE database_default)
INSERT INTO #exch
SELECT Item FROM [SplitDelimitedVarChar] (@exchanges, '|') ORDER BY Item
CREATE CLUSTERED INDEX idx ON #exch (Item)

CREATE TABLE #subs (Item Varchar(20) COLLATE database_default)
INSERT INTO #subs
SELECT Item FROM [SplitDelimitedVarChar] (@subscribers, '|') ORDER BY Item
CREATE CLUSTERED INDEX idx ON #subs (Item)

SELECT 
   [Id]
  ,'' AS 'Name'
  ,[NameId]
  ,[Level]
  ,[Ne]
  ,[CallId]
  ,[Bg]
  ,[DateTime]
  ,[TimeStamp]
  ,[LogOwnerSnb]
  ,[TypeOfLog]
  ,[AbsenceCode]
  ,[AnswerTime]
  ,[CallForwardingReason]
  ,[CallForwardingToNumber]
  ,[CallTransferTime]
  ,[CallTransferReason]
  ,[SeizedSubscriberType]
  ,[SeizedSubscriberTime]
  ,[SeizedSubscriberNumber]
  ,[CalledSubscriberService]
  ,[InSubscriberType]
  ,[InSubscriberNumber]
  ,[CallDirection]
  ,[SubscriberService]
  ,[ClearingCause]
  ,[ClearingCauseTime]
  ,[OnHookTime]
  ,[OutAnswerSubType]
  ,[OutAnswerTime]
  ,[OutAnswerSubNum]
  ,[RingingStartedTime]
  ,[ReroutedToNumber]
  ,[InitiatedService]
  ,[B26]
FROM [dbo].[data_centrex_Ana] AS A
WHERE
    (A.[DateValue] BETWEEN @beginDateValue AND @endDateValue)
AND
    EXISTS(SELECT [Item] FROM #exch WHERE [Item] = A.[Level])
AND
    (A.[TimeValue] BETWEEN @beginTime AND @endTime)
AND
(
   (@target = 1 AND EXISTS(SELECT [Item] FROM #subs WHERE [Item] = A.[LogOwnerSnb]))
   OR
   (@target = 2 AND EXISTS(SELECT [Item] FROM #subs WHERE [Item] = A.[Bg]))
)
END

Answer 1

怀疑在索引中包含选择列有什么好处它只是一个大指数。

尝试加入

SELECT [Id]  
FROM [dbo].[data_centrex_Ana] AS A 
JOIN #exch   
 ON [Item] = A.[Level] 
JOIN #subs    
  ON (@target = 1 AND [Item] = A.[LogOwnerSnb])   
  OR (@target = 2 AND [Item] = A.[Bg]) 
WHERE
     (A.[DateValue] BETWEEN @beginDateValue AND @endDateValue) 
AND  (A.[TimeValue] BETWEEN @beginTime AND @endTime)

大表上的SELECT查询

1 个答案: