Where do transaction data store?

Question

Hi
   1. Do values of char in a cube are stored in  sid table of infoobject corresponding to the char? 
2.if a infoobject belongs to many different cubes then  values in sid table of the infoobject will include all value owned by respective cube?  System will join fact table,demension table and  sid table  for retrieving and displaying  data , in this case ,system distinguish value in sid table via sid as different cube use the same sid table.
    Are what i said right? Could you give some advice or supplement about this topic ?    
   where is infomation which can make me master the system inside  about this topic(net link)?

Answer 1

Hi Guixin,
1. For the charcteristics in the cube SID's are generated in the SID table of the info-object and the values are fetched from the info-object using the SID's.
2. Whenever a cube is loaded with data then new SID's are generated in the SID table. The F fact table of the cube contains the Domension Id as foreign keys. The Dimension table in turn contain the SID's of all the characteristics belonging to that dimension.
<b>Importance of SID table (from SAP help)</b>
In InfoCubes and in aggregates, so-called master data IDs (SIDs), rather than characteristic values, are saved directly. In the SID table, there is a master data ID for every characteristic value. The OLAP processor also works internally only with the SIDs and not with characteristic values.
Dependencies
Generation of SIDs for characteristic M1:
In the following cases SIDs are generated for M1:
Loading of master data for M1
Loading of texts for M1
Loading of master data for a characteristic that has M1 as a navigation attribute
Activation of M1 as navigation attribute for a characteristic
Addition of M1 as navigation attribute for a characteristic if M1 is compounded
Loading of InfoCube data with the option of generating master data
Deactivation of the property exclusive attribute for characteristic M1, if M1 is used in ODS Objects that are released for reporting
In the following cases SIDs for M1 are only generated if M1 is not exclusive attribute):
Activation of data of an ODS object that is released for reporting and contains M1
Release of an ODS object that contains M1 for reporting
Execution of a query on a characteristic as InfoProvider that contains M1 as an attribute
Execution of a query on an InfoSet that contains M1 (via a characteristic or an ODS object)
Example
The content of the SID table for the characteristic Material could be as follows:
MATERIAL       SID
                0
ABC            1
10000          2
DEF            3
10100          4
XYZ            5
RTZE           6
Bye
Dinesh