You are troubleshooting query performance for a SQL Server Analysis Services (SSAS) cube. A user reports that a Multidimensional Expressions (MDX) query is very slow. You need to identify the MDX…

Progress Report Begin tracks the progress of SSAS processing operations (dimension or cube processing), not client MDX query execution.

The Query Begin event class fires when SSAS begins processing a client-submitted MDX query and includes the query text in the TextData column of the trace, allowing direct identification of the slow statement. It corresponds to the full end-to-end query lifecycle as initiated by the user or application, making it the appropriate event for query-level performance troubleshooting.

Execute MDX Script Begin captures the execution of MDX calculation scripts defined in the cube, not ad-hoc MDX queries submitted by users.

Calculate Non Empty Begin is a sub-event within query execution that tracks the non-empty cell calculation phase, not the overall query statement.

Get Data From Aggregation is a sub-event indicating that data is being retrieved from a pre-built aggregation, not the MDX query statement itself.

Query Subcube tracks internal subcube data requests generated during query resolution, not the original MDX query statement submitted by the user.