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DAX vs MDX
What are the advantages and disadvantages of using DAX instead of MDX in SSRS (with tabular cubes)?
There are no real disadvantages to using DAX against a tabular model. DAX is the native expression language for tabular models. But there are a couple of disadvantages to using MDX
- MDX has different semantics, so there are extra steps that need to be done when a tabular model evaluates an MDX query that are not needed when evaluating DAX - resulting in slower performance
- MDX returns multi-dimensional cellsets which have to go through a process called flattening to be consumed by SSRS which also adds extra overhead.
Thank you!