The lowest level in the cube aggregation
Hi guysI designed cube of simple test with a single dimension (the two leads MOLAP).
The PRODUCT dimension consists of three levels:
-Group
-Category
-Product_detail
Table PRODUCT_SRC to load the PRODUCT dimension:
PR_GROUP_NAME PR_GROUP_ID PR_CATEGORY_NAME PR_CATEGORY_ID PR_DETAIL_NAME PRODUCT_DETAIL_ID
1000 dairy yogurts 1000000 yoghurt_1 1000000000
1000 dairy yogurts 1000000 yoghurt_2 1000000001
1000 dairy yogurts 1000000 yoghurt_3 1000000002
Candy cookies_1 1000001 1001 1000000003 cookies
Candy cookies_2 1000001 1001 1000000004 cookies
Candy cookies_3 1000001 1001 1000000005 cookies
1002 1000002 juice_1 1000000006 juice drinks
1002 drinks mineral water 1000003 mineral_water_1 1000000007
1002 1000004 energy_drink_1 1000000008 beverage energy drink
The SALES cube has a measure:
-Value_of_sales (sum aggr)
Table SALES_SRC to load the SALES cube:
PROD_ID ID VALUE
1236 1000000002 2
115 1000000006 3
1697 1000000005 4
12-1000000004-5
168 1000000008 6
7 1000000005 1984
9684 1000000004 8
84-1000000002-9
8 1000000007 10
498 1000000006 11
4894 1000000008 12
4984 1000000004 13
448 1000000003 14
4489 1000000004 15
13 1000000001 16
879 1000000004 17
896 1000000006 18
4646 1000000007 20
I created the PRODUCT dimension and a mapping which loads the data in the dimension. It worked perfectly. The hierarchy has been created as I expected.
Then, I created a mapping that should load the data into the cube and cube SALES. It's very very simple mapping - there were only two points on the canvas:
-Table SALES_SRC
and
-Cube SALE
and two lines:
-of SALES_SRC. VALUE of SALE. VALUE_OF_SALES
-of SALES_SRC. PROD_ID to turnover. PRODUCT_NAME
Then, I have deployed everything and ran mapping, which cube load. , But in my opinion the cube was not populated properly, because this was no aggregation performed at the lowest level of the hierarchy product - it there was only a value of the first occurrence of certain product. I mean:
Turnover. CBC, we have for example:
PROD_ID ID VALUE
1236 1000000002 2
84-1000000002-9
For me the value of the cube must be 1236 + 84 = 1320, but the value of the cube, at PRODUCT_DETAIL_LEVEL, for yoghurt_3 is only 1236 - first occurrence of this product on SALE. CBC.
Why was not the aggregate data at the lowest level of the hierarchy of the PRODUCT dimension - is this the way that OWB did these things?
Should I manually before boarding to the cube data aggregation (just to use aggregator of aggregation of the data at the lowest level)? If so - what incremental loading of cube data (the old value of the value is simply replaced by a new and not added in the cube)
In solutions of other vendors data warehouse cube in such a situation is responsible as I expected here.
I don't really know what to do. I really appreciate help on your part.
Thanks in advance
Peter
If you have several facts for identical dimension member keys then you need to deal with this by aggregation or select the first/last etc...
See you soon
David
Tags: Business Intelligence
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I recently received some excellent comments on how to load measurement data in the cube, but here's my stupid question but fundamental. If I am currently using views initially to aggregate my measurements in fact table, and table is indeed stretching across multiple dimensions, how can I properly build the dimensionality of my cube?
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the fact table
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Post edited by: BrandonNeel Has changed IF (@CURRMBR ("funds")-> "Centre"->"activity"-> "Recipes"->"value" > 0) TO IF (@PARENT (@CURRMBR ("funds"))-> "Centre"->"activity"-> "Fees"->"value" > 0)
Hello
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