Query optimization assistance

[sbuster]

Hello,
I am trying to see if there is a way to optimize the measure in the sample attachment.  The model details an asset (automobile) with events (EventFacts) on a given date.  Each automobile may or may not be associated with a configuration (AssetEventMapping). 

What I would like is a distinct count of assets by day (see DateTable) only if the asset has a configuration associate in the AssetEventMapping table.

The model details below show example tables & records with the desired result.  As can be seen, assets 6 and 7 do not show up in daily count because they do not contain a record in the mapping table (filtered out via the "in distinct" portion of hte measure).

This measure works fine with small dataset, but my real dataset contains millions of records and this query is taking ~5 seconds.

Thanks

Tables:

Measure:

Count of Assets Reporting =

    calculate(

        DISTINCTCOUNT(EventFacts[AssetId]),

        FILTER(

            EventFacts,

            EventFacts[AssetID] in (distinct(AssetEventMapping[AssetID]))

        )

    )

[tamerj1 · Accepted solution]

Hi @sbuster 

Please try

Count of Assets Reporting =
COUNTROWS (
DISTINCT (
SELECTCOLUMNS (
FILTER (
EventFacts,
EventFacts[AssetID] IN ( DISTINCT ( AssetEventMapping[AssetID] ) )
),
"@AssetID", EventFacts[AssetId]
)
)
)

[sbuster]

Thanks for you response, that improved performance significantly!