--獲取批處理信息的腳本(優化器在處理批處理時所發生的優化器事件)
SET NOCOUNT ON;
DBCC FREEPROCCACHE;
--清空過程緩存
GO
--使用tempdb..Optstats表來捕獲執行幾次
IF ( OBJECT_ID(‘dbo.tempdb..Optstats‘) IS NOT NULL )
    DROP TABLE tempdb..Optstats;
GO
--創建臨時表tempdb..Optstats
SELECT  0 Run ,
        *
INTO    tempdb..Optstats
FROM    sys.dm_exec_query_optimizer_info;
 
GO
--該語句的計劃將被保存到過程緩存
--這樣下一次執行時不會產生任何優化器事件
--後面的Go用於確保下次執行這段腳本時可以重用Insert計劃
GO
INSERT  INTO tempdb..Optstats
        SELECT  2 Run ,
                *
        FROM    sys.dm_exec_query_optimizer_info;
GO
--清空臨時列表
TRUNCATE TABLE tempdb..Optstats;
GO
--存儲運行前的信息
GO
INSERT  INTO tempdb..Optstats
        
 
SELECT  1 Run ,
                *
        FROM    sys.dm_exec_query_optimizer_info;
GO
--執行批處理語句
SELECT  C.CustomerID ,
        COUNT(O.OrderID) NumOrders
FROM    dbo.Customers C
        LEFT JOIN dbo.Orders O ON O.CustomerID = C.CustomerID
WHERE   C.City = ‘London‘
GROUP BY C.CustomerID
 
HAVING  COUNT(O.OrderID) > 5
ORDER BY NumOrders;
GO
--保存到臨時表
INSERT  INTO tempdb..Optstats
        SELECT  2 Run ,
                *
        FROM    sys.dm_exec_query_optimizer_info;
GO
/*從臨時表中取出Run1和Run2之間Occurrence或Value值發生改變的所有事件
然後顯示執行批處理或查詢之前(Run1Occurrence和Run1Value)和之後所有這些事件(Run2Occurrence和Run2Value)的Occurrence和Value*/
WITH    X ( Run, Counter, Occurrence, Value )
          AS ( SELECT   *
               FROM     tempdb..Optstats
               WHERE    Run = 1
             ),
        Y ( Run, Counter, Occurrence, Value )
          AS ( SELECT   *
               FROM     tempdb..Optstats
               WHERE    Run = 2
             )
    SELECT  X.Counter ,
            Y.Occurrence - X.Occurrence Occurrence ,
            CASE Y.Occurrence - X.Occurrence
              WHEN 0 THEN Y.Value * Y.Occurrence - X.Value * X.Occurrence
              ELSE ( Y.Value * Y.Occurrence - X.Value * X.Occurrence )
                   / ( Y.Occurrence - X.Occurrence )
            END Value
    FROM    X
            JOIN Y ON X.Counter = Y.Counter
                      AND ( X.Occurrence <> Y.Occurrence
                            OR X.Value <> Y.Value
                          );
GO
--刪除臨時表
DROP TABLE tempdb..Optstats;
GO

sql 獲取批處理信息的腳本(優化器在處理批處理時所發生的優化器事件)