Question

您好我正在使用一个SP，它在服务器中需要7分钟，有7336个recrds 和另一台有3500条记录的服务器中的6秒。

有人能帮助我知道为什么会这样吗？

谢谢， -Divya

THE SP：

SELECT WORKSHEET_ID 来自PERSON PER INNER JOIN PERSON EMPLEE ON EMPLEE.PERSON_ID = PER.PERSON_ID 和 dbo.FN_CHECKRPTSECURITY（EMPLEE.PERSON_ID，@ p_SEC_ACCOUNT_ID）＆gt; 0

  LEFT JOIN SEARCH_ASSIGNMENT_VW PERSON_ASGN 
  ON PERSON_ASGN.ASSIGNMENT_ID =    
                  dbo.FN_GETRPTASSIGNMENTID(EMPLEE.PERSON_ID)

 LEFT JOIN LOOKUP EMPLEE_ASGN_STAT
 ON EMPLEE_ASGN_STAT.TYPE_ = 'ASSIGNMMENT_STATUS_CODE'
 AND EMPLEE_ASGN_STAT.CODE = PERSON_ASGN.ASGN_STAT_CODE
 INNER JOIN 
(SELECT w1.ASSIGNMENT_ID, w1.WORKSHEET_ID, w1.EFFECTIVE_DATE, w1.APPROVED_BY, w3.CREATED_BY
    FROM WORKSHEET_PAYROLL_VW w1 
    INNER JOIN WORKSHEET w3 
    ON w3.WORKSHEET_ID = w1.WORKSHEET_ID
    WHERE w1.EFFECTIVE_DATE = CASE 
                             WHEN @p_MOST_RECENT_ONLY = 'Y' 
                             THEN (SELECT MAX(w2.EFFECTIVE_DATE)
                                   FROM WORKSHEET_PAYROLL_VW w2
                                   WHERE w1.ASSIGNMENT_ID = w2.ASSIGNMENT_ID 
                                   AND (ISNULL(@p_WKS_EFFECTIVE_DATE,w2.EFFECTIVE_DATE) =w2.EFFECTIVE_DATE)) 
                             ELSE ISNULL(@p_WKS_EFFECTIVE_DATE,w1.EFFECTIVE_DATE)
                             END

       )
 PERSON_WKS
 ON PERSON_WKS.ASSIGNMENT_ID = dbo.FN_GETRPTASSIGNMENTID(EMPLEE.PERSON_ID)
 INNER JOIN  
  (SELECT ASSIGNMENT_ID, VALUE
   FROM ASSIGNMENT_HISTORY AH
   WHERE    FIELD_NAME ='HOME PAYROLL GROUP' 
   AND EFFECTIVE_DATE =  (SELECT MAX(EFFECTIVE_DATE)
                          FROM ASSIGNMENT_HISTORY 
                          WHERE ASSIGNMENT_ID = AH.ASSIGNMENT_ID 
                          AND   EFFECTIVE_DATE <=getDate() 
                          AND   FIELD_NAME = 'HOME PAYROLL GROUP')

    )HOME_PAYROLL 
    ON HOME_PAYROLL.ASSIGNMENT_ID = dbo.FN_GETRPTASSIGNMENTID(EMPLEE.PERSON_ID)

   WHERE 
    (@p_SELECTED_PERSON_ONLY = 'N' OR EMPLEE.PERSON_ID = @p_PERSON_ID)
     AND
    (@p_ASGN_STAT_CODE IS NULL OR PERSON_ASGN.ASGN_STAT_CODE = SUBSTRING(@p_ASGN_STAT_CODE,1,1)
     OR PERSON_ASGN.ASGN_STAT_CODE = SUBSTRING(@p_ASGN_STAT_CODE,2,1))
     AND
    (@p_POLICY_ID IS NULL OR PERSON_ASGN.PROGRAM_CODE = @p_POLICY_ID)
     AND
    (@p_HOME_COUNTRY_ID IS NULL OR PERSON_ASGN.HOMECOUNTRYID=@p_HOME_COUNTRY_ID) 
     AND
    (@p_HOME_CITY_ID IS NULL OR PERSON_ASGN.HOMECITYID=@p_HOME_CITY_ID )
     AND
    (@p_HOME_COMPANY_ID IS NULL OR PERSON_ASGN.HOMEBUSINESSID=@p_HOME_COMPANY_ID ) 
    AND
    (@p_HOME_DIVISION_ID IS NULL OR PERSON_ASGN.HOMECOMPONENTID=@p_HOME_DIVISION_ID )
     AND
    (@p_HOST_COUNTRY_ID IS NULL OR PERSON_ASGN.HOSTCOUNTRYID=@p_HOST_COUNTRY_ID )
     AND
    (@p_HOST_CITY_ID IS NULL OR PERSON_ASGN.HOSTCITYID=@p_HOST_CITY_ID )
     AND
    (@p_HOST_COMPANY_ID IS NULL OR PERSON_ASGN.HOSTBUSINESSID=@p_HOST_COMPANY_ID )
     AND
    (@p_HOST_DIVISION_ID IS NULL OR PERSON_ASGN.HOSTCOMPONENTID=@p_HOST_DIVISION_ID )
     AND
    (@p_CREATED_BY IS NULL OR PERSON_WKS.CREATED_BY=@p_CREATED_BY )
     AND
    (@p_APPROVED_BY IS NULL OR PERSON_WKS.APPROVED_BY=@p_APPROVED_BY )
     AND
    (@p_payroll_code IS NULL OR HOME_PAYROLL.VALUE=@p_payroll_code )

按PER.LAST_NAME ASC订购， PER.FIRST_NAME ASC， PERSON_WKS.EFFECTIVE_DATE DESC

第5行中的函数是运行缓慢的函数。该部分的其余部分正在运行4secs

功能：开始宣布 @v_ASGN_COUNT INT， @v_RESULT INT

SELECT @v_ASGN_COUNT = COUNT(ASSIGNMENT_ID) --to find out if this employee has any assignment
FROM ASSIGNMENT
WHERE EXPATRIATE_PERSON_ID = @p_PERSON_ID AND
      ASGN_STAT_CODE IN ('PD','A','I')

IF(@v_ASGN_COUNT > 0)   --yes assignment, check against SECURITY_ASSIGNMENT_VW
BEGIN
    SELECT @v_RESULT = COUNT(ASSIGNMENT_ID)
    FROM SECURITY_ASSIGNMENT_VW
    WHERE SEC_ACCOUNT_ID = @p_SEC_ACCOUNT_ID AND
          ASSIGNMENT_ID IN (SELECT ASSIGNMENT_ID
                FROM ASSIGNMENT
                WHERE EXPATRIATE_PERSON_ID = @p_PERSON_ID AND
                      ASGN_STAT_CODE IN ('PD','A','I'))
END
ELSE    --no assignment, so check against SECURITY_PERSON_VW
BEGIN
    SELECT @v_RESULT = COUNT(PERSON_ID)
    FROM SECURITY_PERSON_VW 
    WHERE SEC_ACCOUNT_ID = @p_SEC_ACCOUNT_ID AND
          PERSON_ID = @p_PERSON_ID
END

RETURN @v_RESULT

END

Answer 1

模式是否完全匹配...特别检查是否缺少索引。

Answer 2

首先，你的标量函数会随着记录数量的增加而显着变慢，因为它们会逐行处理。不仅如果你需要性能，你已经在连接中使用了这些功能，这是一种可怕的做法。你有一堆OR条件往往会变慢。虽然实际阅读你发布的代码太难了（请尝试格式化并且只使用关键字的所有大写字母），但我怀疑其中一些条件并不是可以理解的。

要了解实际发生的情况，请查看执行计划（SQL Server）或解释计划（我认为是mySQL和其他人）或数据库中的等效功能。可能你会发现表扫描，当记录数量增加时，这些扫描当然会变得非常慢。

您可能还有参数嗅探问题。请谷歌看看如何解决这个问题。

Answer 3

一个改进是确保dbo.FN_GETRPTSSIGNMENTID仅执行一次。

目前，它被执行了三次您可以通过加入（一）重新发送呼叫的字段来替换其中两个呼叫。

像

这样的东西

SELECT  WORKSHEET_ID 
FROM    PERSON PER
        INNER JOIN PERSON EMPLEE ON EMPLEE.PERSON_ID = PER.PERSON_ID AND dbo.FN_CHECKRPTSECURITY(EMPLEE.PERSON_ID, @p_SEC_ACCOUNT_ID) > 0
        INNER JOIN (
          SELECT  w1.ASSIGNMENT_ID
                  , w1.WORKSHEET_ID
                  , w1.EFFECTIVE_DATE
                  , w1.APPROVED_BY
                  , w3.CREATED_BY
          FROM    WORKSHEET_PAYROLL_VW w1 
                  INNER JOIN WORKSHEET w3 ON w3.WORKSHEET_ID = w1.WORKSHEET_ID
          WHERE   w1.EFFECTIVE_DATE = 
                    CASE  WHEN @p_MOST_RECENT_ONLY = 'Y' 
                    THEN  (
                            SELECT  MAX(w2.EFFECTIVE_DATE)
                            FROM    WORKSHEET_PAYROLL_VW w2
                            WHERE   w1.ASSIGNMENT_ID = w2.ASSIGNMENT_ID AND (ISNULL(@p_WKS_EFFECTIVE_DATE,w2.EFFECTIVE_DATE) = w2.EFFECTIVE_DATE)
                          ) 
                    ELSE ISNULL(@p_WKS_EFFECTIVE_DATE,w1.EFFECTIVE_DATE)
                    END

        ) PERSON_WKS ON PERSON_WKS.ASSIGNMENT_ID = dbo.FN_GETRPTASSIGNMENTID(EMPLEE.PERSON_ID)
        INNER JOIN  (
          SELECT  ASSIGNMENT_ID
                  , VALUE 
          FROM    ASSIGNMENT_HISTORY AH
          WHERE   FIELD_NAME ='HOME PAYROLL GROUP' 
                  AND EFFECTIVE_DATE = (
                                          SELECT  MAX(EFFECTIVE_DATE) 
                                          FROM    ASSIGNMENT_HISTORY   
                                          WHERE   ASSIGNMENT_ID = AH.ASSIGNMENT_ID 
                                                  AND EFFECTIVE_DATE <=getDate() 
                                                  AND  FIELD_NAME = 'HOME PAYROLL GROUP'
                                      )                   
        LEFT JOIN SEARCH_ASSIGNMENT_VW PERSON_ASGN ON PERSON_ASGN.ASSIGNMENT_ID = PERSON_WKS.ASSIGNMENT_ID
        LEFT JOIN LOOKUP EMPLEE_ASGN_STAT ON EMPLEE_ASGN_STAT.TYPE_ = 'ASSIGNMMENT_STATUS_CODE' AND EMPLEE_ASGN_STAT.CODE = PERSON_ASGN.ASGN_STAT_CODE
       ) HOME_PAYROLL ON HOME_PAYROLL.ASSIGNMENT_ID = PERSON_WKS.ASSIGNMENT_ID
 WHERE  (@p_SELECTED_PERSON_ONLY = 'N' OR EMPLEE.PERSON_ID = @p_PERSON_ID) 
        AND (@p_ASGN_STAT_CODE IS NULL OR PERSON_ASGN.ASGN_STAT_CODE = SUBSTRING(@p_ASGN_STAT_CODE,1,1) OR PERSON_ASGN.ASGN_STAT_CODE = SUBSTRING(@p_ASGN_STAT_CODE,2,1)) 
        AND (@p_POLICY_ID IS NULL OR PERSON_ASGN.PROGRAM_CODE = @p_POLICY_ID) 
        AND (@p_HOME_COUNTRY_ID IS NULL OR PERSON_ASGN.HOMECOUNTRYID=@p_HOME_COUNTRY_ID) 
        AND (@p_HOME_CITY_ID IS NULL OR PERSON_ASGN.HOMECITYID=@p_HOME_CITY_ID ) 
        AND (@p_HOME_COMPANY_ID IS NULL OR PERSON_ASGN.HOMEBUSINESSID=@p_HOME_COMPANY_ID ) 
        AND (@p_HOME_DIVISION_ID IS NULL OR PERSON_ASGN.HOMECOMPONENTID=@p_HOME_DIVISION_ID ) 
        AND (@p_HOST_COUNTRY_ID IS NULL OR PERSON_ASGN.HOSTCOUNTRYID=@p_HOST_COUNTRY_ID ) 
        AND (@p_HOST_CITY_ID IS NULL OR PERSON_ASGN.HOSTCITYID=@p_HOST_CITY_ID ) 
        AND (@p_HOST_COMPANY_ID IS NULL OR PERSON_ASGN.HOSTBUSINESSID=@p_HOST_COMPANY_ID ) 
        AND (@p_HOST_DIVISION_ID IS NULL OR PERSON_ASGN.HOSTCOMPONENTID=@p_HOST_DIVISION_ID ) 
        AND (@p_CREATED_BY IS NULL OR PERSON_WKS.CREATED_BY=@p_CREATED_BY ) 
        AND (@p_APPROVED_BY IS NULL OR PERSON_WKS.APPROVED_BY=@p_APPROVED_BY ) 
        AND (@p_payroll_code IS NULL OR HOME_PAYROLL.VALUE=@p_payroll_code )
ORDER BY 
        PER.LAST_NAME ASC
        , PER.FIRST_NAME ASC
        , PERSON_WKS.EFFECTIVE_DATE DESC

SQL SP运行缓慢

3 个答案: