MDX queries : BW statistics are inconsistents
Hello,
We are implementing BO on top of SAP BW 3.5.
We had some major performance issues , and now we're tryning to investigate in detail.
The queries were first launched on BO only, and afeterwards on SAP BW, using the transaction MDXTEST, we measured a similar amount of time.
Now now want to have a closer look at the distribution of the time spent. (DB%,Frontend%;Network%, etc...)
The problem is that when we have a look at transaction ST03 in BW analysis, the statistics of MDX
queries are inconsistents :
I've join a concrete example :
The left column is a BO statistic executed on SAP using MDXTEST,
The right column is a traditional BEX query.
When I do the addition of the different time %(percent total) the results is 100 % for the Bex query ...and 44% for the MDX query.
I know that many fixes for MDX have been delivered on BI.7, but what about 3.5, I searched the sap notes but I couldn't find any note descrybing this symptom, nor any fix for our BW release.
Do you know how I should interpret thoses results, in other worlds, where ar the missing percentages in MDX queries ?
thank you in advance for your help.
Regards.
InfoCube Name Cube C Cube C
Name of Query Query A(BO) Query B(BEX)
Number of Navigation Steps 1 1
Total Runtime (s) 534,9 39,8
Total Runtime / Navigation Step (s) 534,9 39,8
Median of Total Runtime (s) 534,9 39,8
Initialization Time (s) 0,2 0,4
Initialization Time / Total Runtime (%) 0,04 1,01
Ø Initialization Time (s) 0,2 0,4
OLAP Runtime (s) 0,9 2,1
OLAP Time / Total Runtime (%) 0,17 5,28
OLAP Runtime / Navigation Step (s) 0,9 2,1
Database Runtime (s) 197,0 22,4
Database Runtime / Total Runtime (%) 36,83 56,28
DB Runtime per Navigation Step (s) 197,0 22,4
Frontend Runtime (s) 33,9 4,8
Frontend Runtime / Total Runtime (%) 6,34 12,06
Frontend Time per Navigation Step (s) 33,9 4,8
Master Data Runtime (s) 5,6 10,1
Master Data Time / Total Runtime (%) 1,05 25,38
Ø Master Data Time per Navigation Step 5,6 10,1
Number of records selected 18620 899
Number of Transferred Records 10037 629
Ratio of Selected to Transferred Records 1,9 1,4
Database Time per Selected Record (ms) 10,6 24,9
Number of Cells 162060 7295
Cells per Transferred Records 16,1 11,6
Number Formatted 0 72
Ratio of Formattings to Number of Cells 0,0 0,0
percent Total : 44,43% for MDX and 100,01% as expected for BEX
time 237,8 40,2
Edited by: Raoul Shiro on Feb 5, 2009 6:54 PM
Hi Raoul,
in regards to the BW statistics values I would suggest you open a OSS case.
in regards to the performance improvements - correct they are done for BI7 and the XI 3.1 release.
Ingo
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