Dim Fact table Sizes

Hi Experts,
Could anyone please explain me stats from SAP_INFOCUBE_DESIGNS .
ZABC_C01          /BIC/DZABC_C01       rows:         17    ratio:          5 %
ZABC_C02          /BIC/DZABC_C02       rows:        311    ratio:         88 %
ZABC_C03          /BIC/DZABC_C03       rows:         15    ratio:          4 %
ZABC_C04          /BIC/DZABC_C04       rows:        346    ratio:         98 %
ZABC_C10           rows:    205,786    density:              0.0 %
ZABC_C10          /BIC/FZABC_C10      rows:    205,786    ratio:        100 %
ZABC_C10          /BIC/EZABC_C10      rows:          0    ratio:          0 %
ZABC_C10          /BIC/DZABC_C10P     rows:          2    ratio:          0 %
ZABC_C10          /BIC/DZABC_C10T     rows:        171    ratio:          0 %
Any measures to be taken ?
Appreciating your help Thanks.

Report Writer,
The ration between the each individual dimension rows and the fact table rows. OK. Say that you have 2000 rows in the fact table and 200 entries in the dimension table, that is about 10 times of the dimension size is what you have in your fact table. currently at this rate it is ok, but there are chances for this parity to grow and the ration might become more than 10% of the fact tablke in the future and it is called high cardinality, you need to find ways to minimize that. If you cannot then declare the field as 'line item dimension'. This will help better as this directly stores the sid in the cube, so the join if more efficient.
If you use LISTSCHEMA for a cube and expand the tree structue to look at each table with SE11 or SE16 you will get more idea about the cube and the join and lot more info. This will help you understand better.
Hope this helps.
Alex(Arthur Samson)

Similar Messages

How we will know that dimension size is more than the fact table size?

how we will know that dimension size is more than the fact table size?

Hi,
Let us assume that we are going to take Division and distribution channel in a dimension and assume we have 20 distinct values for Division in R/3 and 30 Distinct values for Distribution channel .So Maximum, we can get 20 * 30 records in dimension table and we can take rough estimation of records in the cube by observing the raw data in source system.
With rgds,
Anil Kumar Sharma .P

Fact table size of the cube

BW Gods!
I need to selectively delete data from a cube which holds data from 2001-2006.....say I want to delete data only for 2001. It was suggested to me by pizzaman in one of our earlier threads that BW would decide if the data to be deleted is more than 10% of the cube size and if it is, it would just copy the cube without the data which has to deleted and it would rename the cube. So he suggested that I should find out the fact table size and make sure that there is enough space in my fact tablespace for this operation to go on.
My question is, how do I find out the fact table size of the cube?
How do I find out if there is enough space on fact tablespace for the above said deletion operation to be executed.
I am not too sure whether I have put across the question correctly. Let me know.
Thank you all in adavance
Ashwin

You want to make sure you include space for the F fact table and the E fact table, assuming you compress the infocube. If you use DB02 and use wild cards you migh be able to get all teh size info in one shot.
Gnerally, he indices for an InfoCube don't occupy a lot of space, but they do take space.
The default InfoCube table space is PSAFACTD and indics are in PSAPFACTI - not 100% sure that is universal acorss all the different DBs. Your shop could also have put them in differnt tablespaces altogether. Probably worth a quick check with your DBAs - they might know that they have lot of space availalbe, and you don't need to take the time to run down the space usage info.
The table copy process will NOT delete the original fact tables unless/until it has successfully loaded to new copy.

Reason for dim fact tables ratio

Friends.
What is the exact reason for Dim tables not be greater than 20 % of Fact tables.
How does that really impact performance?

Hi,
In an extended star schema, dimension tables stores the DIM IDs and SID IDs to access the data from the actual characteristics. These dimension tables are attached with fact table with DIM IDs. Now if the size of the DIM table is as large as the size of fact table, then the cause of DIM table will not be used at all. It is as good as referring the master data for each record from fact table itself.
That's why it is ideally suggested that the ratio size of DIM table to that of fact table is 1:10.
Hope this info helps you.
Regards,
Yogesh.

Problem Facing while analyzing Dim/Fact Table % using RSRV

Hi All,
When we analyzing the infocube in RSRV to see percentage of Dimension tables, system is showing 0% for all the dimensions and also for Fact tables.
But data is existing in fact table of infocube and also in dimensions tables, when we see in SE11.we also executed report SAP_INFOCUBE_DESIGNS in SE38, in their also we are not able to find any entry for particular infocube.Please advice on this ASAP.
Regards
Manoj

Hi,
Check whethere the statistics for the cube is run. If not refresh the stats ans then chk in RSRV or in SAP_INFOCUBE_DESIGNS you will get the ratio betwene ur dim and fact table
Hope it helps.
Regards,
Malar B

Fact table size

Hi Experts
Iam working on implementation project, here already some cube are there is a sales, financials & Material Movements cube.
Here Sales and financial cubes are customer define means start with u2018Zu2019.
Here my doubt is how to know the fact table & cubes size? & how to calculate the fact table &
cube size for customer define and SAP define in our SAP BI 7.0 systems .
Regards
SKBABU

Hello,
Check this document:
[http://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/d0427b8a-7fe5-2c10-f1be-a8be71fa2c06?QuickLink=index&overridelayout=true]
Regards,
Jorge Diogo

Dim & fact table sizing details

Hello Folks,
Is there any transaction which gives us direct relationship about sizing of dim and fact tables?
Thanks,
Suyog.

Hi Suyog,
Run this Program in SE38 SAP_INFOCUBE_DESIGNS .
This gives the Ratio aswell number of records.And also Dimension Mismatch.
Rgds
SVU

Joining bridge ,dim,fact table

Hi
I have scenario where I have a bridge table,dimension table,and 2 fact tables.
The dimension table is a common table for both fact tables.
The bridge table contains the dimension tables Primary key.
The bridge is also having an other dimension table PK, but that table is not joined to any fact table.
Now I have a req where I have to get a column from bridge table and fact2 tables.
Individually when I pull those columns I am getting data.
When I pull those 2 columns together , getting " the specified criteria dint result in any data".
Tried changing joins in RPD nothing worked.please help me , this is very urgent.
In SQL developer when I joined bridge and fact or dimension and bridge I am able to get expected results.
Thanks
Sr

Hi Suyog,
Run this Program in SE38 SAP_INFOCUBE_DESIGNS .
This gives the Ratio aswell number of records.And also Dimension Mismatch.
Rgds
SVU

Size of dimention table fact table ratio question..

Hey Guys !!!
I have very basic question regarding the ratio of size of dimention table and fact table..
its mentioned that the ratio of dim table / fact table sizes should not be greater than 1:20 for performance reasons .. thats OK..
now lets say if i have fact table with customer dim_id ,some other dimention ids , and revenue (KF) .. with 1 million records ..
so ideally my customer dimention table should not have more than 200,000 recods (.ie 200,000 different customers ).
doesnt this put limitation on number of customers in a cube ?
if so, how do we handle this ?
please correct me if i am wrong in interpreting the concept of dimension table.
thanks in advance
swapnil

Hi ASRao ,
thanks for replying ...
you said exactlly what i know ..
sorry i didnt put my question in correct prespective ...
whay i meant was...
lets say , i need to have more than specified (1:20 ) number records in dimension table ,it will definately hamper my reporting performance ...
so, is there any solution to handle this kind of problem ?
like how would i maintain my efficiency of reporting in this case ?
thanks in advance

How to find Size of the fact table?

hello all
how do i find out the size of the fact table?
Is the size of the fact table is same as size of the cube.
pls let meknow
regards
balji

Hello Balaji,
To find out size of fact table
DB02 ->Detailed anaysis -> Fact table name
It will show you the details.
The size of cube is not exactly equal to the size of fact table, but usually as fact table is much more larger than dimension tables, fact table size will give you a fair idea about cube size.
Hope it helps.
Regards,
Praveen

Two FACT Tables, Some Common and Non-Common Dimensions

Hello all, a question i am sure you have faced in the past but still wanted to get your feedback.
I have a few FACT tables and some dimensions that are shared (common dimensions). Rest of the dimensions are related to one or the other FACT tables.
What is the best way to present a view where users can pull information from both the FACT tables?
I am successful in pulling the shared (common) dimensions across BOTH FACT tables having the same grain but this view breaks down when i pull information from one Dimension that has not much to do with the other FACT.
What is the best way to present this? Should this be broken in three subject areas?
Subject Area 1 --> Some Dims --> FACT Table A
Subject Area 2 --> Some Dims --> FACT Table B
AND
Subject Area 3 --> ***Only Common Dims*** --> FACT Table A & FACT Table B?
Your feedback is always appreciated.
Regards,
Edited by: user10679130 on Oct 12, 2009 3:27 PM

Please check the forum first for similar threads/questions.
Joining two fact tables with different dimensions into single logical table
http://108obiee.blogspot.com/2009/08/joining-two-fact-tables-with-different.html
This solution keeps both fact tables in the same subject area in the single logical fact table, with common and not-common dimensions.
Regards
Goran
http://108obiee.blogspot.com

[Schema Design]: How to reduce inventory snapshot table size

We are planning to store inventory level's periodic snapshot at the end of each day. We have close to 50k different products.
But on a given day only 5-6k products inventory changes.
As I understand if I start inserting just the products which have changed inventory, analysis around semi-additive dimension (Quantity) doesn't work properly.
For better understanding, lets take say the fact table looks like:
product_id time_id quantity
1 1 100
2 1 130
3 1 100
1 30 200
So basically, it says product 1,2,3 from time_id 1 to time_id 29 doesn't have any update in quantity. But product_id 1's inventory changes to 200 on time_id 30.
This approach reduces fact table size by approx 90 rows.
My question is, is it a good idea? Would this semi-additive dimension still give the same result (I doubt though)?
If not, then what other approaches I can take?
Thanks in advance.

Another option is to capture just the net changes (sometimes referred to as a journalized fact table). Then you can create a calculated measure that sums all the changes from the beginning of time up to the current time-slice.
This may seem like an inefficient solution, but there are ways to reduce the problem by limiting the history for which inventory snapshots are available. For example, if the business only needs snapshots for the past 90 days, then you can grab a snapshot
of inventory for all products on day 0, and then capture the net changes for each product for days 1-90. Then you can calculate the snapshot in time by adding the baseline snapshot to the sum of all net changes.
BI Developer and lover of data (Blog |
Twitter)

Fact table is GT Dimension table

Hi All
Where can i find the relation between Fact table and dimension table sizes. If i want to check whether my dimension table is greater than fact table then how?
If i can use program " sap_infocube_designs" then when i am trying to execute it it is not working.
regards
Naga

I dont think SAP_INFOCUBE_DESIGNS doesnt give u the size of the fact table rather the density and the row count in the cube.
"density" in SAP_INFOCUBE_DESIGNS
check the answer by pizzaman in this thread detailing the size of the fact tabe
Fact table size of the cube

Do we have some way to reduce Dimension table size using NLS?

Initially we thought the Cube
archive in NLS would be like:
Replicate Cube in NLS with DAP. DAP creation will create a new structure same like "Star Schema".
While we load data to NLS it deletes from DB.
And hence it reduced size of the DB.
Associated Dimensions will also be replicated in the NLS.
After actually implementation we found :
Fact table size is reducing and DB size with associated E/F fact table is reducing
Dimension tables are still there in DB, and still saving space in DB.
Do we have some other way to reduce Dimension table size using NLS?
As when we are analyzing top 100 tables in SAP BW, we are seeing multiple dimensions are part
of this list.
Thanks,
Jaydip

Hi Jaydip,
Please check below link it might be helpful for you.
http://www.informatik.uni-jena.de/dbis/lehre/ss2011/dbarch/SAP_BW_DB2_NLS_22062011.pdf

Determine the size of Dim and Fact table

Hi,
Please some one tell me how do calculate the size of diminsion and fact table
Please explain me step by step.
Thanks

hi
We have two other ways also
Try RSRV test: Elementary > dataBase > DataBase Info about InfoProvide Tables
and You can check out in DB02 tcode Detail Analasys...
Thanks
Khaja

Dim Fact table Sizes

Similar Messages

Maybe you are looking for