Dimension table is larger than the fact table
Hi Community,
How can we explain the phenomenon when a dimension table has MORE records in it than the fact table ? What are the conditions that would cause this to occur ?
Thank you !
Keith
Thanks, Bhanu,
I am wondering specifically how to explain the output from program SAP_INFOCUBE_DESIGNS when the dimension table is shown to have a fact table ratio that is greater than 100%
I believe that SAP_INFOCUBE_DESIGNS already takes into consideration both the E and also the F-fact table when calculating the ratio. So in this case, we could not explain it by your first suggestion (after compression - but looking at only the F table).
In the case where selective deletions have been performed, how can we correct the situation ? For example, how could we clean out the records in the dimension tables which no longer have any facts in the fact table ? (I think the BW system should do this automatically as a part of the selective deletion, don't you agree ?).
Also, is there any other explanation for how the dimension table could arrive at greater than 100% the size of the fact table(s) ?
For example, lets say that (theoretically) we placed many very dynamic characteristics together into the same dimension.. which we know you should not do. Would it be possible for the combination of these very many dynamic characteristics to cause so many DIM IDs that the dimension table overtakes the record count of the fact table ? Is this situation then made worse by compression if the number of fact table records is reduced thanks to removal of the request ID ?
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