Question

您好以下是我为SQL 2008编写的查询。插入500000条记录需要2个多小时。任何人都可以建议一种提高绩效的方法吗？

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)

Answer 1

您是否尝试过避免DISTINCT查询的内部查询？

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

Answer 2

试试这个 -

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, '') != ''

Answer 3

如果您使用恢复模型作为事务，它将记录所有，“您可以使用BUlk记录恢复如果您有更多插入发生，并尝试最小化案例语句使用联接而不是LEft联接而不是条件

SQL Query执行时间太长

3 个答案: