How to find quickly what's wrong with the performance of a BW Query?

Hi All,
After a long time, I had to work on performance tuning of a query, Version BI 7.0 EHP 1, SP7.
Compression in done, BI Stats are running, showing that OLAP time is high almost 70%, compared to 20% DB Read time.
Aggregates cannot be created due to the nature of the cube, BIA is out of scope.
How to find quickly, step by step, what's wrong with a particular query.
Thanks in advance,
Best Regards,
- Shashi

Hi Sashi ,
1. OLAP time is more, you need to increase OLAP cache, you have different options for the query in RSRT t-code..
Select properties which makes to store the query result set in OLAP Cache for permanent.
Doc for the same :
http://www.sdn.sap.com/44A46FE1-6DC0-4F2C-A8CB-A1BB45DF0186/FinalDownload/DownloadId-ED38793C4C172FE2AFFDE727E36B3991/44A46FE1-6DC0-4F2C-A8CB-A1BB45DF0186/irj/scn/go/portal/prtroot/docs/library/uuid/f048c590-31a4-2c10-8599-bd01fabb93d4?QuickLink=index&overridelayout=true
2.Use only less no of Characteristics in the initial report. Place remaining in Free characteristics.
3.You need to check the query .It cmod code exist for any variable or your query have lots of navigational attributes then try to check for code efficiency .
4.If Front End time more then try to avoid the more characteristics in displaying the query result.
5.Use authorization objects on queries if possible .That will reduce data amount .
6.Use query read mode and global structures as when possible.
Some helpful links :
http://www.tli-usa.com/download/Expert_Tips_and_New_Techniques_for_Optimizing_Data_Load_and_Query_Performance__Part_Two_.pdf
how to increase the performance
Aggregates in SAP BW
bw statistics
What is the use of cube partition?
Create indices before or after compression
Regards,
Jaya Tiwari

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