performance - 查询优化/性能

Question

我有一个执行不良的 sql 查询，它导致表扫描/ IO 峰值。请检查以下脚本和执行计划，如果它需要任何索引或查询本身的重构，请告诉我。谢谢

- 询问

SELECT TOP 20
        CustomerPrimaryExtID,
        Max(POSTimeStamp) AS TransactionDate,
        ExtLocationCode,
        0 AS RedemptionAmount,
        0 AS RedemptionCount,
        TerminalNum,
        LogixTransNum,
        POSTransNum AS TransNum,
        0 AS DetailRecords,
        CustomerTypeID,
        PresentedCustomerID,
        PresentedCardTypeID,
        HHID,
        Replayed,
        0 AS TransContext,
        ISNULL(TransTotal, 0) AS TransTotal
    FROM TransHist AS TH WITH(nolock)
    WHERE 
        ( 
            ( 
                ( CustomerPrimaryExtID IN ( '' ) AND HHID IS NULL )
                OR HHID = '0000000250000007320' AND CustomerTypeID <> 1 
            )   OR ( CustomerPrimaryExtID = '0000000250000007320'   AND CustomerTypeID = 1 )
        )
        AND NOT EXISTS
        (
            SELECT
                    LogixTransNum
                FROM   TransRedemptionView AS TR2
                WHERE  
                    (
                        ( ( CustomerPrimaryExtID IN ( '' )  AND HHID IS NULL )  OR HHID = '0000000250000007320' AND CustomerTypeID <> 1 )
                        OR ( CustomerPrimaryExtID = '0000000250000007320'   AND CustomerTypeID = 1 )
                    )
                    AND TH.LogixTransNum = TR2.LogixTransNum
        )
    GROUP  BY
        CustomerPrimaryExtID,
        HHID,
        CustomerTypeID,
        PresentedCustomerID,
        PresentedCardTypeID,
        LogixTransNum,
        POSTransNum,
        TerminalNum,
        ExtLocationCode,
        Replayed,
        TransTotal
    ORDER  BY TransactionDate DESC