What is the difference between ODS and PSA?

DIFFERENCE BETWEEN ODS AND PSA?

hi..
ODS:
Stores consolidated data on the document level.
Data is stored in transparent tables.
Reporting is possible.
Represented on the database by three transparent tables.
Stores Transaction data.
Can merge data from different infosources.
Can be defined as a datasource for another Bw system.
ODS has granular data, it is volaital.
ODS having the Over write functionality
contains Current data
PSA:
It is source system dependent.
Stores data in 2-D format.
We can edit data in PSA.
Reporting is not possible.
used mainly for performing manual update or simulate update or reconstruction.
partition is possible.
Data stored in psa can be used for several purposes.
Repeated delta updates possible.
Error handling posibility.
Structure of PSA is called as Trasfer structure.
It stores the data exactly like how the data is presented in the source system.
We have psa and ODS but we can't do reporting on PSA
You can do reporting in ODS , In PSA u cant do reportin directly
ODS contains detail -level data , PSA The requested data is saved, unchanged from the source system. Request data is stored in the transfer structure format in transparent, relational database tables in the Business Information Warehouse. The data format remains unchanged, meaning that no summarization or transformations take place
In ODS u have 3 tables Active, New data table, change log, In PSA u dont have
We can only add in PSA and change, add and delete in ODS.Is the statement true?
we can edit/add the records in PSA and delete the records,
i thjink its not possible to edit the records in ODS, u can delete the records, and u can add records in ODS
check out this link..
PSA and ODS
hope it helps..

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Hi ,
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903830 wrote:
some say count(1) is faster and some say count(*), i am confused about count function?In the link provided by Prakash :
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