Question

我正在尝试创建一个报告，该报告将允许我的用户基于列和日期的总和进行选择。因此，我创建了一个表，一列，值是1到20。还有一个日期选择，今天加上14天。在我要求给我所有停电4次以上的设备或Date（2019,07,17）之前，它在20秒内加载了我的视觉效果。现在，我正在使用selectedvalue（），它花费了我9分钟的视觉时间和54秒的加载时间。有什么问题吗？

这需要10分钟

Repeat Devices Outage Count = 
var numberSelect = SELECTEDVALUE(Numbers[Numbers])
VAR datesSelection = SelectedValue(Date Selection[DateWoTime])
VAR devicesTotal =
    CALCULATETABLE (
        VALUES ( Outages[Feeder_Device] ),
        ALLSELECTED ( Outages ),
        Outages[DATE] >= datesSelection,
        VALUES ( Outages[Feeder_Device] )
    )
var caseTotal = CALCULATE (
        COUNT ( Outages[CASE_ID] ),
        ALLSELECTED ( Outages ),
        Outages[Feeder_Device] IN devicesTotal)
VAR devices =
    CALCULATETABLE (
        VALUES ( Outages[Feeder_Device] ),
        ALLSELECTED ( Outages ),
        Outages[DATE] >= datesSelection
    )
RETURN 
        SWITCH(TRUE(),
        caseTotal >= numberSelect,
        CALCULATE (
            COUNT ( Outages[DEVICE_ID] ),
            FILTER ( Outages, Outages[Feeder_Device] IN devices )
        ),
        BLANK()
    )

这需要20秒或更短的时间。

Repeat Devices Outage Count = 
var numberSelect = 4
VAR datesSelection = Date(2019,07,17)
VAR devicesTotal =
    CALCULATETABLE (
        VALUES ( Outages[Feeder_Device] ),
        ALLSELECTED ( Outages ),
        Outages[DATE] >= datesSelection,
        VALUES ( Outages[Feeder_Device] )
    )
var caseTotal = CALCULATE (
        COUNT ( Outages[CASE_ID] ),
        ALLSELECTED ( Outages ),
        Outages[Feeder_Device] IN devicesTotal)
VAR devices =
    CALCULATETABLE (
        VALUES ( Outages[Feeder_Device] ),
        ALLSELECTED ( Outages ),
        Outages[DATE] >= datesSelection
    )
RETURN 
        SWITCH(TRUE(),
        caseTotal >= numberSelect,
        CALCULATE (
            COUNT ( Outages[DEVICE_ID] ),
            FILTER ( Outages, Outages[Feeder_Device] IN devices )
        ),
        BLANK()
    )

为什么selectedvalue（）会使我的报告减速这么快？

Answer 1

除非您使用了DAX STUDIO之类的方法来衡量小节中的每个元素，否则我都不认为SELECTEDVALUE()是元凶。我将从消除不必要的FILTER调用开始，因为这些调用实际上是在每次执行时在内存中创建整个表。试试这个：

Repeat Devices Outage Count =
VAR numberSelect =
    SELECTEDVALUE ( Numbers[Numbers] )
VAR datesSelection =
    SELECTEDVALUE ( 'Date Selection'[DateWoTime] )
VAR devicesTotal =
    CALCULATETABLE (
        VALUES ( Outages[Feeder_Device] ),
        ALLSELECTED ( Outages ),
        Outages[DATE] >= datesSelection,
        VALUES ( Outages[Feeder_Device] )
    )
VAR caseTotal =
    CALCULATE (
        COUNT ( Outages[CASE_ID] ),
        ALLSELECTED ( Outages ),
        Outages[Feeder_Device] IN devicesTotal
    )
VAR devices =
    CALCULATETABLE (
        VALUES ( Outages[Feeder_Device] ),
        ALLSELECTED ( Outages ),
        Outages[DATE] >= datesSelection
    )
RETURN
    SWITCH (
        TRUE (),
        caseTotal >= numberSelect, 
        CALCULATE ( COUNT ( Outages[DEVICE_ID] )
        , Outages[Feeder_Device] IN devices ),
        BLANK ()
    )

或者这个（相当于可读性更强）：

Repeat Devices Outage Count =
VAR numberSelect =
    SELECTEDVALUE ( Numbers[Numbers] )
VAR datesSelection =
    SELECTEDVALUE ( 'Date Selection'[DateWoTime] )
VAR devicesTotal =
    CALCULATETABLE (
        VALUES ( Outages[Feeder_Device] ),
        ALLSELECTED ( Outages ),
        Outages[DATE] >= datesSelection,
        VALUES ( Outages[Feeder_Device] )
    )
VAR caseTotal =
    CALCULATE (
        COUNT ( Outages[CASE_ID] ),
        ALLSELECTED ( Outages ),
        Outages[Feeder_Device]
            IN devicesTotal
    )
VAR devices =
    CALCULATETABLE (
        VALUES ( Outages[Feeder_Device] ),
        ALLSELECTED ( Outages ),
        Outages[DATE] >= datesSelection
    )
RETURN
    SWITCH (
        TRUE (),
        caseTotal >= numberSelect, CALCULATE (
            COUNT ( Outages[DEVICE_ID] ),
            FILTER (
                ALL ( Outages[Feeder_Device] ),
                Outages[Feeder_Device]
                    IN devices
            )
        ),
        BLANK ()
    )

本文：FILTER ARGUMENTS IN CALCULATE克服了在整个表上使用FILTER的危险。

Answer 2

因此，我已经调整了代码，这可以正常工作。这是我能想到的最接近“具有”功能的东西。现在我的报告恢复正常。我想这不是选定的值，因为“ Outages [DATE]> = dateSelection”的工作原理应该是这样。因此，我假设它必须使用“ IF”和“ Switch”功能。

Repeat Devices Outage Count = 
var numberSelect = SELECTEDVALUE(Numbers[Numbers])
VAR datesSelection = SELECTEDVALUE('Date Selection'[Date])
VAR devicesTotal =
    CALCULATETABLE (
        VALUES ( Outages[Feeder_Device] ),
        ALLSELECTED ( Outages ),
        Outages[DATE] >= datesSelection,
        VALUES ( Outages[Feeder_Device] )
    )
var caseTotal = CALCULATE (
        COUNT ( Outages[CASE_ID] ),
        ALLSELECTED ( Outages ),
        Outages[Feeder_Device] IN devicesTotal)
VAR devices =
    CALCULATETABLE (
        VALUES ( Outages[Feeder_Device] ),
        ALLSELECTED ( Outages ),
        Outages[DATE] >= datesSelection
    )
RETURN 
       CALCULATE (
            COUNT ( Outages[DEVICE_ID] ),
            FILTER ( Outages, Outages[Feeder_Device] IN devices ),
            FILTER(Outages, caseTotal >= numberSelect)
        )

使用SelectedValue时缓慢测量/视觉

2 个答案: