Power BI and Premium Dataset Cache

Hi Bamak ,

I don't know much about the query cache, the following is for reference only:

1) For Premium datasets we can manage queries cache options

I Guess , it's exclusively linked to IMPORT mode , no ?

No. According to the official documentation, Query caching is not applicable to LiveConnect datasets leveraging Azure Analysis Services or SQL Server Analysis Services. So, it is also applicable to DirectQuery. 

Dax queries results for visuals are stock in the cache

all the time the underlying model is not refreshed (import)

According to the official documentation, at present the service only does query caching for the initial page that you land on. In other words, queries aren't cached when you interact with the report. So, I agree with you.

For Live & Direct query , I think rather that all  DAX request are instantannely  transmited to Sourcing system ...then no caching of responses

First, Query caching is not applicable to LiveConnect datasets leveraging Azure Analysis Services or SQL Server Analysis Services.

Then, for DirectQuery, according to the official documentation, Performance especially benefits when a dataset is accessed frequently and doesn't need to be refreshed often. Query caching can also reduce load on your Premium/Embedded capacity by reducing the overall number of queries. So, if the underlying dataset doesn't refresh often, DAX query will be cached.

2) In desktop we can also empty cache (via options)

Is this also an option closely related to mode IMPORT for data ?

Copies of query preview results are stored on your local disk for faster viewing later. Not just for Import mode but also for DirectQuery. You can pay attention to this: after connecting to a data source at a certain time, and then connecting to this data source after a while, you will see a reminder: this data is preview ...(how long) ago...

Best Regards,

Icey

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