SAP BW OLAP Universe performance issue

Hi,
Based on BO recommendation, I created a universe on top of a big BEX query which included all characteristics and key figures from a cube. I then created a webi report with 5 characteristics and 1 key figure from this universe. I also create the same report in BEX query designer(same number of objects). I ran both. The Bex query completed under a minute and the webi report took more than 12 minutes to run. I did a bunch of other test with different number of objects combination and saw similar differential in query performance.
I did a trace using 'sm50' and saw the open SQL submitted to BW from BEx was very different from what got submitted from the webi report. Here is what I saw in pseudo code.
Bex:
select dimension1.blah, dimension2.blah, dimension3.blah, dimension..... sum(measure)
from dimension1, dimension2, dimension3, dimension..... factTable
where dimension1.SID = factTable.d1SID
and dimension2.SID = factTable.d2SID
and ......
and (query filters)
OLAP Universe
select dimension1,blah, dimension1.SID
from dimension1, factTable
where dimension1.SID = factTable.d1SID
select dimension2,blah, dimension2.SID
from dimension2, factTable
where dimension2.SID = factTable.d2SID
select dimension3,blah, dimension3.SID
from dimension3, factTable
where dimension3.SID = factTable.d3SID
It seems the OLAP universe was querying the BW cube one dimension at a time and then somehow piece the result sets together to form the final result set. Dimension tables join to the fact table without any filter definitely causes performance issue. Beside, I have no idea why the query requests are submitted to the BW system like that.
I looked in varies forums and found no similar issues posted by others. Has anyone had any performance problem with there OLAP universe? Is this a matter of configurations?
My envrionment:
SAP BW 3.5
BOXI 3.0
ORACLE DB (version ??)

Hi,
You cannot compare a BEx query and a universe query by just comparing the trace.
BEx query makes ABAP calls and universe query makes MDX calls;
Moreover there is only one MDX call sent to SAP, what you have noticed is that there is one MDX call to retrieve member for a given characteristic whereas a prompt has been set on.
Last, Web Intelligence consume only flattened data (row sets) wheras BEx consume data sets.
That means that there is a flattening operation between SAP OLAP engine and the data sent to the Web Intelligence document.
A fix have been developed for a customer to improve performance on Web Intelligence queries, this fix will be available for all customers in SP2 planned in June 09.
Here is a a brief summary of what the fix provide:
- Provide data directly from SAP server to Web Intelligence document. Avoid unnecessary conversion steps: row set --> data set --> row set
- Eliminate redundant sort operations
- Other optimization operations
Didier
Edited by: Didier Mazoue on Nov 20, 2008 8:38 AM

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