Combains 2 facts (witth two separate dimensions)

Hello,
my question is- how two combain two facts, when each of them has it's own dimension?
I've got F1-D1 and F2-D2, i need to combain them by D1-D2, which contains same information- five letters code
F1, F2, D1 and D2 are in the same subject area.
Thanks for all hints:)

You could make 1 dimension in the RPD with 2 branches ending in a shared level (your 5 letter code).
regards
John
http://obiee101.blogspot.com

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Using two facts of two different star schemas and conformed dimensions

Hi,
I've been working as developer and database designer for years and I'm new to Business Objects. Some people says you can not use two facts of two different star schemas in the same query because of conformed dimensions and loop problems in BO.
For example I have a CUSTOMER_SALE_fACT table containing customer_id and date_id as FK, and some other business metrics about sales. And there is another fact table CUSTOMER_CAMPAIGN_FACT which also contains customer_id and date_id as FK, and some other business metrics about customer campaigns. SO I have two stars like below:
DIM_TIME -- SALE_FACT -- DIM_CUSTOMER
DIM_TIME -- CAMPAIGN_FACT -- DIM_CUSTOMER
Business metrics are loaded into fact tables and facts can be used together along conformed dimensions . This is one of the fundamentals of the dimensional modeling. Is it really impossible to use SALE_FACT and CAMPAIGN_FACT together? If the answer is No, what is the solution?
Saying "you cannot do that because of loops" is very interesting.
Thank you..

When you join two facts together with a common dimension you have created what is called a "chasm trap" which leads to invalid results because of the way SQL is processed. The query rows are first retrieved and then aggregated. Since sales fact and campaign fact have no direct relationship, the rows coming from either side can end up as a product join.
Suppose a customer has 3 sales fact rows and 2 campaign fact rows. The result set will have six rows before any aggregation is performed. That would mean that sales measures are doubled and campaign measures are tripled.
You can report on them together, using multiple SQL passes, but you can't query them together. Does that distinction make sense?

Again: two facts and one conformed dimension

Dear all,
I know this has been asked quite often but I haven't found a solution for my problem here. Believe me I have done a lot of searching across the net ..
What I want to do is the following:
I have two fact tables with a number of common dimensions. A report should show the two facts across these common dimensions.
To keep it simple I start with only one common dimension.
Here's what get's to the db from OBIEE:
*SELECT Revenue."Date (YYYYMMDD)" saw_0, Sales."Day Day Code" saw_1, Revenue."TPV (Total Payment Volume in Millicent [€])" saw_2, Sales.DEBIT_AMOUNT saw_3 FROM "Company KPIs" ORDER BY saw_0, saw_1, saw_3*
Note that *Revenue."Date (YYYYMMDD)"* and *Sales."Day Day Code"* are the same field from the common time dimension. I just put them in different presentation tables for the end users.
TPV and DEBIT_AMOUNT are facts from the two different cubes.
Everything fine, right?
Now I look at the nqquery.log:
RqList
Dim Time.Day Day Code as c1 GB,
Dim Time.Day Day Code as c2 GB,
*Tpv:[DAggr(Cube Revenue.Tpv by [ Dim Time.Day Day Code, Dim Time.Day Id, CUBE_SALES.DEBIT_AMOUNT] )] as c3 GB,*
CUBE_SALES.DEBIT_AMOUNT as c4 GB,
Dim Time.Day Id as c5 GB
OrderBy: c1 asc, c2 asc, c4 asc
now the bold thing looks odd to me. Is he trying to aggregate one cube based on the other? Could be the problem, but where to influence this?
And finally this translates into this query:
WITH
SAWITH0 AS (select distinct T4110.DEBIT_AMOUNT as c1,
T281.DAY_DAY_CODE as c2,
T281.DAY_ID as c3
from
DIM_TIME T281,
CUBE_SALES T4110
where ( T281.DIMENSION_KEY = T4110.DIM_TIME ) ),
SAWITH1 AS (select distinct SAWITH0.c2 as c1,
SAWITH0.c2 as c2,
*cast(NULL as DOUBLE PRECISION ) as c3,*
SAWITH0.c1 as c4,
SAWITH0.c3 as c5
from
SAWITH0)
select SAWITH1.c1 as c1,
SAWITH1.c2 as c2,
SAWITH1.c3 as c3,
SAWITH1.c4 as c4
from
SAWITH1
order by c1, c2, c4
As you see, the tpy ist gone and a NULL appears. That's what I see in the report. TPV is always NULL.
So where did I miss a configuration ???
Thanks, Knut

You only need to set the content levels on the measures themselves when you want non-conformed dimensions in the report, as your working with fully conformed dims just make sure your levels are set on the content tab for each Logical Table source in the Logical fact table. Leave the non-conformed dim hierarchies as blank.
Remember - You should put a hierarchy on each logical dim , even if there is no real hierarchy, just have a total -> Detail.
You should always always always set your content levels for logical table sources, both in Dimensions and Logical fact LTS's.
If they are greyed out, make sure your not in read only, have checked the object out if on-line mode, failing that, perform the changes off-line then re-start your BI Server.

Referencing two fact keys from one dimension using Dim.Key = Fact.Key1 OR Fact.Key2 possible ?

Hi all
I need your help for an approach to the following problem. Lets say that i have the following dataset
AccountMonth
ActivityMonth
Amount
201307
201301
2.500
201307
201304
600
201307
201305
900
201307
201306
4.000
201307
201307
500.000
201308
201305
500
201308
201307
400
201308
201306
300
201308
201308
400.000
201309
201307
300
201309
201302
500
201309
201309
100.000
201310
201305
400
201310
201309
50.000
201310
201310
200.000
In my cube i want the user to select the Accountmonth from one time dimension, but i want some logic to also apply for the ActivityMonth. For one measure if I for example select 201307 i'll get this amount
AccountMonth
ActivityMonth
Amount
201307
201301
2.500
201307
201304
600
201307
201305
900
201307
201306
4.000
201307
201307
500.000
This is easy - Accountmonth dimension is related to AccountMonth column in the fact table. Now i also need another measure, where the month selected needs to be meet for both accounting and activity month. This is also easy, as i can just reference both
columns in the fact table. Result in this case is then only one row:
AccountMonth
ActivityMonth
Amount
201307
201307
500.000
Now the tricky part comes when I start to select more months, because the amount i need is where month combinations are shared, so if i for example choose 201307, 201308 and 201309 i don't just want
AccountMonth
ActivityMonth
Amount
201307
201307
500.000
201308
201308
400.000
201309
201309
100.000
I actually want the amount from which the months is in either accounting or activity, like this
AccountMonth
ActivityMonth
Amount
201307
201307
500.000
201308
201307
400
201308
201308
400.000
201309
201307
300
201309
201309
100.000
I know how to solve it either by having two time dimensions or using MDX, but user should only have to select from one time dimension. So far, solving it using Non-empty/existing in MDX is not performing fast enough. Feedback will be appreaciated if you
have an idea of how to solve this.

So far, solving it using Non-empty/existing in MDX is not performing fast enough. Feedback will be appreaciated if you have an idea of how to solve this.
here are some links about performance tuning
http://www.mssqltips.com/sqlservertip/2565/ssas--best-practices-and-performance-optimization--part-1-of-4/
http://technet.microsoft.com/en-us/library/cc966527.aspx

Multiple 'logical joins' between a fact table and one dimension table

It appears that one cannot create multiple ‘logical joins’ between a fact table and one dimension table in OBIEE using the Oracle BI Administration Tool. For example, considering a Business Model with a dimension table TIMES and a fact table FACT containing START_TIME and END_TIME, we would like to create separate logical joins from FACT to TIMES for the START_TIMEs and END_TIMEs? Obviously, the underlying foreign keys can be created, but as far as I can tell the Oracle BI Administration Tool doesn’t support this. The workaround would be to replicate the TIMES table, but that’s ugly.
I seek an alternative approach.

Try this. Create an two aliases for the TIMES dimension (Start & End) in the Physical Layer and then remove foreign key to the "Parent" Times dimension. Create the Foreign Key in the Physical Layer to the new aliases and then create the complex joins in the BMM Layer to the new aliases as well. This will allow you to present both dates within the same table in the Presentation Layer. Not the most elegant solution but it works.

I want to use two separate Lion Time Machine backups and use them to create two separate profiles on one new computer

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I have an iMac 27 (end of year 2009) I5. It has 1 TB internal and I want to replace it with a 2 TB internal.
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I have another iMac (my son's)Imac 24 Intel Core 2 Duo that has it's own separate Time machine backup to it's own separate firewire connected external drive. Both machines are completely up to date with the latest version of Lion and all other necessary software updates.
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My son's profile will be using about 250 gigs of total space.
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I realize that during the temporary period that Time Machine will be making backups of this entire two profile setup, which I am now understanding as I write this will create a new issue for me when I want to transfer only my profile to the new computer as well. But one bridge to cross at a time, I guess.
I need to do this because we must bring his current computer to my father - as his iMac G5 is inoperable. We have been doing this round robin hand me down in our family since IMac DV special edition :-)
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Thanks very much.

Hey Shootist000, Thanks for the replies. First off, I am actually okay if we both have each other applications so I am not concerned about that. It is still unclear from what you have said as to whether I can in fact, use these two separte time machine backup to create two separate profiles on the new hard drive. If that in fact can be done, then - will it create two copies of the apps we both have in the ROOT of the drive as well as placing all the ones we each have separately?
And reading your second reply, makes me think that maybe the partition is the way to go to begin with and then down the road - after I am in the new iMac, I could reformat the iMac 27 with only one partion and restore my son's latest back prior to the reformat thus giving him full access to the 2 TB of the drive.
If this is still making sense, does this mean :
replace the 1TB with a 2TB - but have it partitione - 1.5 TB & 500 GB.
Install(Restore using Time Machine) my latest back up prior to the 1.5 partition
Install (Restore using Time Machine) my son's latest back up prior to the 500 gig partition
Lastly, in order for us both to be using the partioned computer - I am assuming Switch user can no longer be used - so would we need to restart and select our respective partions in order to use the computer? And if so, how would we each be able to be using time machine to back up - two separte external hard drives - with each one dedicated to only one partition? Or ?
Thanks so much.
Ironically, I am only trying to do this so that I don't need to manually install all his apps, setting, games, blah blah for this temporary period. :-)

Join fact table with higher dimension level

how do i join fact tables with higher dimension levels with discoverer?
fact with detail at level C
measure X
dimension with
D->C->B->A
E->C
level
A B C
1------1------1
2------2------1
3------2------1
join between fact X and dimension level C
X=3*C because of sum(X) in discoverer and 3xC in dimension
is there a way to get correct values for X without creating a dimension like
D->C
E->

another way of asking this is whether you can create a summary table in Discoverer at a higher level than a dimension's fundamental grain. In other words - the summary examples in the documentation all describe leaving out one or more of your dimensions... they are either left in or completely taken out. But, some of the most effective summarization occurs when you summarize daily data to a monthly level. Assuming that I have a sales table (at a daily level, and a key value sales_date), and a table date_dim (primary key sales_date), I would like to create a summary sales_month_summary where the sales are grouped on month_year (which is a field in the sales_date table).
How is this done? I suspect that we can't use the date_dim table with the summary (due to the problems noted by the poster above). Do we have to create another table "month_dim"? Do we have to fold all of the desired date attributes (month, quarter, year) into the summary? Obviously we'd like to re-use all of the pertinent already existing date items (quarter, month, year, etc.), not recreate them over again, which would result in essentially two sets of items in the EUL. [One used for this month summary, and another used for the detail.]
I searched the forum - someone asked this same question back in 2000 - there was no answer provided.
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Material attributes in separate dimension?

Hi BW experts,
As a new member I have been looking for a similar topic but unfortunately I can't find anything on it so I was hoping one of you could help me out.
I want to redesign our stock/movement cube due to performance issues. One step is to have the 0MAT_PLANT as a separate (line-item) dimension as opposed to a charateristic of 0MATERIAL. I assume this will help a great deal since 0MAT_PLANT has over 8.5 M entries which does not really help to speed up any queries. (fact table has about 40M records)
Another thing is that I would like to create a separate dimension with 0MAT_PLANT navigational attributes like service level, ABC indicator etc. These fields are now in the material dimension and I reckon these nav attr blow up the dimension massively since one material has multiple service levels and ABC indicators. Can I just drag in these field into a new dimension, say Material Attributes and still have them in there as master data?!
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Thanks heaps!
Cheers,
Niels

Thanks Pizzaman.
I do not think it will be a good idea to physically put the master data in the cube in my case so I have to keep it as master data.
Can you explain to me what happens when I take the following steps:
I take out the 0MAT_PLANT characteristic (which has 8.5M records) and create a separate (line item) dimension for it and I leave the NA for 0MAT_PLANT (like service level and ABC indicator) in the Material dimension.
Would this have any impact on the number of records to be read when I run a query for plant, material and ABC indicator?
Doesn't the query still have to read the 8.5M records which are now in the 0MAT_PLANT dimension instead of the 0MATERIAL dimension?
So does creating a separate 0MAT_PLANT dimension have any impact on query performance?
I do understand you point about the indexes and that might work.
Hope you can help me with this
Thanks.
Cheers

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Ivanhoe255 wrote:
Sigh...that was sarcasm (mixed with slight contempt of Apple for making my life ****)
I know what you need to do!
Buy yourself a turntable and some records - you know, that vinyl stuff (that I grew up with):
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Combains 2 facts (witth two separate dimensions)

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