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Brettp761 Advocate II
Advocate II

Direct Query vs. In-Memory Overview



One of the most important design decisions you have to make when building PBIX or SSAS 2016 Tabular models is whether you import/load the data from the source system into memory or if you use Direct Query mode and let the source system process the report queries. If your source system is a supported Direct Query data source, and the model you're building is more than a quick pilot/POC, then you have to know and evaluate the many trade-offs such as performance, data freshness, modeling features supported, maintenance, etc.


I tried to summarize many of these factors and considerations in a Word document available for download from my blog:


SSAS 2016 Tabular: In-Memory vs Direct Query


Note: This document should not be viewed as comprehensive and per my blog more testing and research on the DAX restrictions/limitations and the SQL query plans generated across source systems is needed.



Moderator v-qiuyu-msft

Re: Direct Query vs. In-Memory Overview

Hi @Brettp761,


Thanks for your sharing. Smiley Happy


Best Regards,
Qiuyun Yu

Community Support Team _ Qiuyun Yu
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.
Microsoft hervema

Re: Direct Query vs. In-Memory Overview

Great document. Thanks for sharing your work and reflexions !!

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