性能調優小T-SQL IF ELSE STATEment，運行數千次

Question

我試圖從這個查詢中擠出一些性能，任何幫助將不勝感激，我唯一能做的就是在第二個語句中刪除順序爲它是由主鍵

--SET STATISTICS TIME ON 

DECLARE    
     @MasterAdGroupId Int = 3469476, 
     @IncludeDeleted Bit = 1, 
     @Deleted Bit = 0, 
     @IncludeDirty Bit= 0, 
     @Dirty Bit =1, 
     @IncludeDupes Bit=0, 
     @OrderByText Bit= 1, 
     @UseInDisplayNetworkOnly Bit=0 

BEGIN 

SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED 
IF @OrderByText=1 
BEGIN 
    SELECT MasterKeywordId, Text, URL, MasterAdGroupId, mk.KeywordTemplateId, Dirty, mk.Deleted, Negative, Duplicate 
     FROM admanMasterKeyword_tbl mk 
INNER JOIN admanKeywordTemplate_tbl kt on kt.KeywordTemplateId = mk.KeywordTemplateId 
    WHERE MasterAdGroupId = @MasterAdGroupId 
     AND mk.Deleted = CASE WHEN @IncludeDeleted=0 THEN @Deleted ELSE mk.Deleted END 
     AND Dirty = CASE WHEN @IncludeDirty=0 THEN @Dirty ELSE Dirty END 
     AND Duplicate = CASE WHEN @IncludeDupes=1 THEN Duplicate ELSE 0 END 
     AND UseInDisplayNetwork = CASE WHEN @UseInDisplayNetworkOnly=1 THEN 1 ELSE UseInDisplayNetwork END 
    ORDER BY Text 
END 
ELSE 
BEGIN 
    SELECT MasterKeywordId, Text, URL, MasterAdGroupId, mk.KeywordTemplateId, Dirty, mk.Deleted, Negative, Duplicate 
     FROM admanMasterKeyword_tbl mk 
INNER JOIN admanKeywordTemplate_tbl kt on kt.KeywordTemplateId = mk.KeywordTemplateId 
    WHERE MasterAdGroupId = @MasterAdGroupId 
     AND mk.Deleted = CASE WHEN @IncludeDeleted=0 THEN @Deleted ELSE mk.Deleted END 
     AND Dirty = CASE WHEN @IncludeDirty=0 THEN @Dirty ELSE Dirty END 
     AND Duplicate = CASE WHEN @IncludeDupes=1 THEN Duplicate ELSE 0 END 
     AND UseInDisplayNetwork = CASE WHEN @UseInDisplayNetworkOnly=1 THEN 1 ELSE UseInDisplayNetwork END 
    ORDER BY MasterKeywordId 
END 

END 

Answer 1

這不會改變任何東西的性能明智的排序，但如果你要在兩個查詢變化是它們的排序方式（我看不出任何差異）您可以在ORDER BY中放置一個CASE語句，而不必重複自己或者根本不需要重複IF語句：

SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED 

    SELECT MasterKeywordId, Text, URL, MasterAdGroupId, mk.KeywordTemplateId, Dirty, mk.Deleted, Negative, Duplicate 
     FROM admanMasterKeyword_tbl mk 
INNER JOIN admanKeywordTemplate_tbl kt on kt.KeywordTemplateId = mk.KeywordTemplateId 
    WHERE MasterAdGroupId = @MasterAdGroupId 
     AND mk.Deleted = CASE WHEN @IncludeDeleted=0 THEN @Deleted ELSE mk.Deleted END 
     AND Dirty = CASE WHEN @IncludeDirty=0 THEN @Dirty ELSE Dirty END 
     AND Duplicate = CASE WHEN @IncludeDupes=1 THEN Duplicate ELSE 0 END 
     AND UseInDisplayNetwork = CASE WHEN @UseInDisplayNetworkOnly=1 THEN 1 ELSE UseInDisplayNetwork END 
    ORDER BY (CASE WHEN @OrderByText = 1 THEN Text ELSE MasterKeywordId END) 

該查詢的查詢計劃是什麼樣的？任何地方你可以創建索引？