How to find "good" aggregate candidates?

Hi specialists,
I'd like to know how one can find good aggregate-candidates - without hopping from bw-user to bw-user and ansking him "which characteristics do you use mainly"?
I know that the rsrt gives the possibility to show the aggregate that would have been used if it would have exist.
The hatch: Aggregates are on a "per cube" base - not really on a per query-base.
It would be nice if the BI-Statistics could provide information about the mainly used characteristics-combinations per Cube. But I did not find such an information yet.
So my question is: How to you determine good aggregate-candidates - without "guessing" and "user-hopping"?

Hi Marco,
first question would be: What is a good aggregate ?
Usually this is a aggregate which is often used and which will really speed up queries.
I only try to find aggregates if users start to complain, because maintaining them can be verytime consuming. So first rule: Create no aggregate unless you have no other choice.
If users complain, I go to the RSDDSTAT tables. Unfortunatly you did not mention if you use 3.5 or 7.0. Both use different RSDDSTAT tables. But they have one thing in common: They deliver Information about DB performance, number of read entries and number of used entries. An aggregate will only help you if the performance problem is in the DB time. Everything else is cache, release, client.
Okay, assuming you found a lot of queries which a long DB time. Then you can look at the number of read entries. If the read entries and the used entries are on the same level, no Aggregate will help you. If there are significantly more read entries than used entries, an aggregate may help (example: 100.000 read, 20.000 used is worth considering an aggregate). If you found queries with characteristic, you have to take a look at them and find out which causes the large number of reads. Then hopefully you will find out which aggregate would be usefull using RSRT.
There is categorie of Aggregates which come in handy: Aggregates on Hierarchy levels. If some of your Queries use hierarchies, it may be usefull to create aggregates on a middle hierarchy tier. Especially if the users tend to start at the hierarchie node an drill down.
That are some thought to consider. Hope it helps.
For more, I would like to suggest the most interesting SAP Training I ever did: TEWA50 BW Query Tuning. This training is always mentioned in the Early Watch Alert, but I couldn't find any entry in the SAP Training schedule since BI 7.0.
Kind regards,
Jürgen

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1. generally how many aggregates do we need to create on a cube?
it depends on your specific needs, you can need none or several.
2. how do i use propose from last navigation? it is not creating any aggregates
Can you elaborate?
3. is there a way for system to propose less number of aggregates?
In any of the menus of screen for creating aggregates you have an option for sytem propose aggregates for one specific queries i am not sure it worked with multicubes.
4. if nothing works i want to cut the volume of the aggregates base on years or quarters. how do i do that?
You should delete 0calday from aggregates in order to accumulate data for any greater time unit. Other solution for times is to study try to do a partition in cube.
5. should i change it to fixed value and bring in the line items too and create it?
Can you elaborate?
6. I wanted to try propose aggregate from query option..but my query is on multiprovider...and not able to copy it to cube..
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try transaction st03
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Some other approches yet answering
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