SQL查询执行时间太长

您好所有下面都是我为SQL 2008编写的查询。插入500000条记录需要2个多小时。任何人都可以提出一种提高性能的方法吗？SQL查询执行时间太长

INSERT INTO tblUserFile 
SELECT 
    CASE 
     WHEN UD.IdentityStatus = 'A' THEN 'ACTIVE' 
     WHEN UD.IdentityStatus in ('T','') THEN 'INACTIVE' 
     WHEN UD.IdentityStatus IS NULL THEN '' 
    END, 
    --'UD.IS' AS "Status", 
    ISNULL(UD.HltID,'') AS "USERID", 
    ISNULL(UD.HltID,'') AS "USERNAME", 
    ISNULL(UD.FirstName,'') AS "FIRSTNAME", 
    ISNULL(UD.LastName,'') AS "LASTNAME", 
    ISNULL(UD.MiddleInitials,'') AS "MI", 
    '' AS "GENDER", 
    ISNULL(UD.EmailAddress,'') AS "EMAIL", 
    CASE 
     WHEN SU.UserType = 'C' THEN ISNULL(MCU.Manager, '') ----look into this 
     WHEN SU.UserType = 'R' THEN 'From LMS SuperViser' 
     WHEN SU.UserType IS NULL OR SU.UserType = '' THEN '' 
    END, 
    '' AS HR, 
    '' AS "DEPARTMENT", 
    '' AS "JOBCODE", 
    '' AS "DIVISION", 
    ISNULL(UD.Office,'') AS "LOCATION", 
    '' AS "TIMEZONE", 
    '' AS "HIREDATE", 
    ISNULL(UD.Title,'') AS "TITLE", 
    ISNULL(UD.StreetAddress,'') AS "ADDR1", 
    '' AS "ADDR2", 
    ISNULL(UD.City,'') AS "CITY", 
    ISNULL(UD.State,'') AS "STATE", 
    ISNULL(UD.Zip,'') AS "ZIP", 
    ISNULL(UD.CountryCode,'') AS "COUNTRY", 
    '' AS "REVIEW_FREQ", 
    '' AS "LAST_REVIEW_DATE", 
    ISNULL(UD.EmployeeType,'') AS "Custom01", 
    '' AS "Custom02", 
    CASE 
     WHEN SU.UserType = 'C' THEN '' 
     WHEN SU.UserType = 'R' THEN ISNULL(FSBD.Name,'') 
     WHEN SU.UserType IS NULL OR SU.UserType = '' THEN '' 
    END, 
    '' AS "Custom04", 
    '' AS "Custom05", 
    '' AS "Custom06", 
    '' AS "Custom07", 
    '' AS "Custom08", 
    CASE 
     WHEN SU.UserType = 'C' THEN 'Corporate' 
     WHEN SU.UserType = 'R' THEN 'Hotel' 
     WHEN SU.UserType IS NULL OR SU.UserType = '' THEN '' 
    END, 
    ISNULL(UD.EmpId,'') AS "Custom11", 
    '' AS "Custom13", 
    '' AS "Custom14", 
    '' AS "Custom15", 
    '' AS "PositionCode", 
    ISNULL(SU.HomeFacility, '') AS "HomeFacility", 
    'NPS' AS PSFlag 
FROM Search..UserData UD 
    LEFT JOIN Search..ManagerForCorpUsers MCU ------ look into this 
    ON MCU.EmpID = UD.EmpId 
    AND UD.EmpId != '' 
    AND UD.EmpId IS NOT NULL 
    LEFT JOIN Search..securityUsers SU ------ look into this 
    ON UD.UserId = SU.UserID 
    AND UD.UserId != '' 
    AND UD.UserId IS NOT NULL 
    LEFT JOIN EIS.dbo.NewQueryFilter NQ 
    ON SU.HomeFacility = NQ.FCNB 
    AND SU.HomeFacility != '' 
    AND SU.HomeFacility IS NOT NULL 
    LEFT JOIN Facility..fcSubBrandDesc FSBD 
    ON NQ.SubBrand = FSBD.SubBrand 
    AND NQ.SubBrand != '' 
    AND NQ.SubBrand IS NOT NULL 
WHERE 
    ISNULL(UD.IdentityStatus,'') NOT IN ('D','U','L') 
    AND ISNULL(UD.EmployeeType,'') NOT IN ('O','V','') 
    AND ISNULL(UD.HltId,'') != '' 
    AND ISNULL(UD.EmpId,'') NOT IN (SELECT DISTINCT UserId FROM Search..CurrentUserFile)

来源

2013-05-13 14578446

你有上MCU.EmpID，UD.EmpId，UD.UserId，SU.UserID，SU.HomeFacility，NQ.FCNB，NQ.SubBrand和FSBD指标。 SubBrand。同样在UD.IdentityStatus，UD.EmployeeType和UD.HltId上？ – ankurtr 2013-05-13 05:53:20

SELECT没有插入需要多长时间？ – 2013-05-13 09:23:53

你试过避免了DISTINCT查询内部查询？

Search..CurrentUserFile的大小是多少？

尝试这样的事情 -

SELECT 
.... 
FROM Search..UserData UD 
    ... -- all your earlier joins as it is 
    LEFt JOIN Search..CurrentUserFile CU on (UD.EmpId=CU.UserId) 
WHERE 
    ... -- all your where clause 
    AND CU.UserId IS NULL;--only show results which are not in CurrentUserFile

来源

2013-05-13 06:07:31 Kshitij

尝试这一个 -

SELECT ... 
FROM (
    SELECT * 
    FROM Search.dbo.UserData UD 
    WHERE ISNULL(UD.UserId, '') != '' 
     AND ISNULL(UD.IdentityStatus, '') NOT IN ('D','U','L') 
     AND ISNULL(UD.EmployeeType, '') NOT IN ('O','V','') 
     AND ISNULL(UD.HltId, '') != '' 
     AND ISNULL(UD.EmpId, '') NOT IN (
         SELECT DISTINCT UserId 
         FROM Search.dbo.CurrentUserFile 
        ) 
) UD 
LEFT JOIN Search.dbo.ManagerForCorpUsers MCU ON MCU.EmpID = UD.EmpId 
LEFT JOIN Search.dbo.securityUsers SU ON UD.UserId = SU.UserID 
LEFT JOIN EIS.dbo.NewQueryFilter NQ ON SU.HomeFacility = NQ.FCNB 
    AND ISNULL(SU.HomeFacility, '') != '' 
LEFT JOIN Facility.dbo.fcSubBrandDesc FSBD ON NQ.SubBrand = FSBD.SubBrand 
    AND ISNULL(NQ.SubBrand, '') != ''

来源

2013-05-13 05:57:58 Devart

并且不要使用“”/''（[COLUMN] AS'COLUMN NAME'），更优选的是使用方括号作为列名 - [COLUMN] AS [COLUMN NAME] – Devart 2013-05-13 06:03:57

如果您使用的是恢复模型事务会记录所有的，“你可以如果你有多个插件，发生使用大容量日志记录恢复，并尽量减少语句使用案例加盟而是和左而是不加入的条件

来源

2013-05-13 06:04:18

SQL查询执行时间太长

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