在sql中找到CTE的替代方法：性能问题

Question

  

我有一张表，其中有16M记录。我正在尝试使用下面的查询来使用CTE查找所需的结果，但运行查询需要超过45个Minuit。现在我应该打破查询还是有以下查询的替代方案？

 DELETE  FROM Table1
    WHERE   IDD_Memid = @memid;  


    WITH    CTE_Example(MJD_Introducer, MJD_memid, Depth, MJD_doj, mjd_lr)  
              AS (SELECT    MJD_Introducer, MJD_MemID, 0 AS Depth, MJD_DOJ,  
                            MJD_LR  
                  FROM      Table2
                  WHERE     MJD_MemID = '10000001'  
                  UNION ALL  
                  SELECT    MJD_Introducer,  
                            MJD_MemID,  
                            CTE_Example.Depth + 1 AS Depth,
                            MJD_DOJ,  
                            MJD_LR  
                  FROM      Table2
                  JOIN      CTE_Example ON Table2.MJD_Introducer = CTE_Example.MJD_memid)  
        INSERT  INTO Table1(IDD_MEMID, IDD_DOWNID,  
                                             IDD_LEVEL)  
                SELECT  @memid AS 'IDD_MEMID', MJD_memid AS 'IDD_DOWNID',  
                        Depth AS 'IDD_LEVEL'  
                FROM    CTE_Example  
                WHERE   CTE_Example.MJD_memid <> @memid  
                ORDER BY CTE_Example.Depth, CTE_Example.MJD_memid   
        OPTION  (MAXRECURSION 30000);