Relation between different tables in extended star schema
Hi Experts,
I searched all many threads to understand the how Attribute change run is used for
But a small question is going still.
Is attribute change run used for getting consistent data from aggregates or from infocubes.
Attribute change run is used to update the master data .Then what is the use of "activate master data "
in context menu of the master data infoobject.
Somewhere I have read that Attribute change run is used for updating Aggregates but it has got nothing to
do with Infocubes,Is it right ?
Please clarify me
Thanks in advance
Sundar
Hi Sundar,
Is attribute change run used for getting consistent data from aggregates or from infocubes.
The purpose of ACR is to update the changes happened in master data to aggregates not for aggregates.
Attribute change run is used to update the master data .Then what is the use of "activate master data "
in context menu of the master data infoobject.
when you click on activate master data, the data in P or Q or X or Y tables will get activated(if any records with version M will turned to version A)
ACR is used to update the same changes to aggregates
Somewhere I have read that Attribute change run is used for updating Aggregates but it has got nothing to
do with Infocubes,Is it right ?
Yes you are wright.here we have small logic when ACR is running if you start any rollup step it will get fail.
While ACR is running aggregates will get locked
Regards,
Venkatesh
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Please go through this URL you will get overall Idea about Extended Star schema with DIM ID's,SID's and Data flow.
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In Extended star schema,master data will load separately ,which will connect through sid's to dimension table .
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InfoCubes are made up of a number of InfoObjects. All InfoObjects (characteristics and key figures) are available independent of the InfoCube. Characteristics refer to master data with their attributes and text descriptions.
An InfoCube consists of several InfoObjects and is structured according to the star schema. This means there is a (large) fact table that contains the key figures for the InfoCube, as well as several (smaller) dimension tables which surround it. The characteristics of the InfoCube are stored in these dimensions.
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The dimensions and the fact table are linked to one another using abstract identification numbers (dimension IDs) which are contained in the key part of the particular database table. As a result, the key figures of the InfoCube relate to the characteristics of the dimension. The characteristics determine the granularity (the degree of detail) at which the key figures are stored in the InfoCube.
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The fact table and dimension tables are both relational database tables.
Characteristics refer to the master data with their attributes and text descriptions. All InfoObjects (characteristics with their master data as well as key figures) are available for all InfoCubes, unlike dimensions, which represent the specific organizational form of characteristics in one InfoCube.
Integration
You can create aggregates to access data quickly. Here, the InfoCube data is stored redundantly and in an aggregated form.
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If the above info is useful, please grant me points -
Wat is the use of sid in extended star schema rather than linking masterdat
hi bw gurus,
wat is the use of sid in extended star schema rather than linking masterdata with dimention tables?
thanx in advace,
i will assign points,
srinivashi,
the sid are used instead of the data in order to avoid the redunduncy of data.
and reduce the datastorage size.
the data will be present in the sid table and the data is linked used the corerponding sid in the dimension.
regards -
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Hi ALL,
Fact table --- Dimension table -
Sid Table -- master data values.
Fact table:
Contains Key Figures and Dimensional id's
Dimension table:
Contains Dim Id & SID
SID table:
SID and Master object ID ( eg: Customer ID)
Master Data Table:
contains Customer Attributes , Texts , Hierarchies for that Customer ID.
THis is the Extended Star Schema design.
MY DOUBT:
1)In Dimension table itself if we place that Customer ID(No SID table next) what will happen?
Fact table --> Dimension table --> Master data Table
2)Instead of that SID table we can directly place that CustomerID in Dimension table , so we can reduce one layer inbetween Dimendion table and Master data table.Is it correct or not?
Any one can clarify my doubt.
Regards,
Arun.M.DSID means 'surrogate ID'. That is an system created id as you know. Main purpose is fastening the search.
Mostly, there exists a rule for Customer or Material ID's.
Like it should be CHAR 10 or CHAR 16.
This kind of alpha-numeric fields are harder to search when compared to integers. Moreover, your customer id can be 10 digits but, this does not mean you will have 1000000000 customers. This is the main reason that, an internal ID is produced. If you have 10000 customers, your SID will be at most 10000.
However, if your customer ID's are starting from 1 and growing up like integers, then your argument would be true. ( but still no way to skip SID creation and direct usage of characteristic ID in fact table)
Also, as mentioned by other friends, there exist the Line Item dimension property if you have only one characteristic in one dimension. That simply does skip the DIM ID creation step, and puts your SID into the Fact table. ( Since you have only one char in the dimension, no combination is possible)
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