SAP BW BEx query - WEBi MDX query

Hi Experts, have we had some discussion on this?
Does MDX query send by WEBi report to BW use the same program to extract data from BW database?
One of the option for WEBi report source of data is to build Universe on top of BEx query. Could you share how this process actually happen.
I think
- WEBi query will pass parameters that is relevant for BEx query filter of the universe
- the BEx query will then extract the data (following normal process if we run BEx query independently)
- if WEBi has further filtering, it will then get the BEx result above and filter it further ..??
So, how is MDX query come into the picture?
Or is it:
- WEBi query and the BEx query will determine what MDX query will be generated, and this MDX query will then fetch the data.
But why BEx query extract data faster then MDX query?
Sorry, i am new to this. hope someone could share some light here. In the meantime i continue to real those documentation and try to get some more ideas of what is actually happening.

Hi Thanks a lot for pointing this out.
Did i understand it correctly that BEx query is using a different set of program (platform) to retrieve data compare to MDX query, and not MDX uses those program that is used by BEx to retrieve data from BW database and have extra steps on top of that?
Can anyone share what is actually happen WEBi MDX query is executed (how the database is hit with SQL, and what are the tools to evaluate the efficiency of the WEBi (or the used BEx). As for BEx we have RSRT to analyze it right.
And even to test the MDX query using MDXTEST and try to get the data from WEBi report, i found WEBi report still take considerably a lot longer. Why is this so? just because BO is a different system then BW?
And as it's shared the BO 4.0 is using the same platform as BEx to retrieve data from BW database, does this mean we don't need to care about MDX usage in BW anymore as far as BO data extraction concern?
Thank you very much.

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