sql-server - SQL 查询调整 - MS SQL Server -2012

Question

我是 SQL 调优新手。我有以下 SQL，大约需要 15 到 20 秒才能生成结果。

SELECT D.DealerName,
       Z.Zone,
       C.Id                             ,
       L.Id                             ,
       A.Id                             ,
       L.LeadDate,
       LT.LeadType                      ,
       EM.FirstName + ' ' + EM.LastName ,
       LS.LeadSource                    ,
       --C.*,
       E.Id                             ,
       E.StartDateTime,
       0                                ,
       Chiefed = CASE A.AppointmentTypeId
                   WHEN 3 THEN 'True'
                   ELSE ''
                 END,
       9                                AS WorkflowPhase
FROM   Customers C( NOLOCK )
       INNER JOIN Dealers D
               ON C.DEALERId = D.Id
       INNER JOIN Leads L( NOLOCK )
               ON L.CustomerId = C.Id
       INNER JOIN Appointments A( NOLOCK )
               ON A.LeadId = L.Id
                  AND ( NOT( A.AppointmentTypeId = 5
                              OR A.AppointmentTypeId = 6 ) )
       JOIN CalendarEvents E( NOLOCK )
         ON E.TableId = 1
            AND E.TableRowId = A.Id
            AND E.IsDeleted = 0

            AND Dateadd(hh, @TZO, Getdate()) >= E.StartDateTime
       LEFT OUTER JOIN AppointmentResults AR( NOLOCK )
                    ON AR.EventId = E.Id
       LEFT OUTER JOIN LeadSources LS( NOLOCK )
                    ON LS.Id = L.LeadSourceId
       LEFT OUTER JOIN LeadTypes LT( NOLOCK )
                    ON LT.Id = L.LeadTypeId
       LEFT OUTER JOIN Users EM( NOLOCK )
                    ON EM.Id = E.EmployeeId
       LEFT OUTER JOIN Zone Z( NOLOCK )
                    ON Z.Id = C.ZoneId
WHERE  EXISTS(SELECT 1
              FROM   WorkflowStatus WS( NOLOCK )
              WHERE  TableId = 1
                     AND TableRowId = A.Id
                     AND WorkflowPhaseId = 9
                     AND IsCompleted = 0
                     AND IsDeleted = 0)
       AND ( EXISTS (SELECT 1
                     FROM   dbo.Uft_userpermissionzonesbyworkflow(@EmployeeId, 9)
                     WHERE  ZoneId = C.zoneid) )
       AND EXISTS (SELECT 1
                   FROM   Uft_userenableddealers(@EmployeeId)
                   WHERE  DealerId = C.DealerId)
ORDER  BY C.LastName,
          C.CompanyName,
          C.CompanyContact 

我已经调整了我的知识，但我仍然可以看到一些索引扫描。我尝试将这些索引扫描转换为索引查找，但由于记录数量而无法实现。

平面图及顶部操作请引用截图 请提供任何建议来临时解决此查询。

Answer 1

DECLARE @p TABLE (DealerId INT PRIMARY KEY WITH (IGNORE_DUP_KEY=ON))
INSERT INTO @p
SELECT DealerId
FROM dbo.Uft_userenableddealers(@EmployeeId)

DECLARE @z TABLE (ZoneId INT PRIMARY KEY WITH (IGNORE_DUP_KEY=ON))
INSERT INTO @z
SELECT ZoneId
FROM dbo.Uft_userpermissionzonesbyworkflow(@EmployeeId, 9)

SELECT ...
FROM ...
WHERE  EXISTS(SELECT 1
              FROM   WorkflowStatus WS( NOLOCK )
              WHERE  TableId = 1
                     AND TableRowId = A.Id
                     AND WorkflowPhaseId = 9
                     AND IsCompleted = 0
                     AND IsDeleted = 0)
       AND C.zoneid IN (SELECT * FROM @z)
       AND C.DealerId IN (SELECT * FROM @p)
ORDER  BY C.LastName,
          C.CompanyName,
          C.CompanyContact
OPTION(RECOMPILE)