The purpose of a PSA ?

I know that in a PSA data can be stored exactly like in it's source, but what is the purpose of this ?
why should I use a PSA and why not directly to a data target without a PSA in between ?

hi,
Definition
The Persistent Staging Area (PSA) is the initial storage area for requested transaction data, master data attributes, and texts from various source systems within the Business Information Warehouse.
Use
The requested data is stored in transparent, relational database tables. It is stored in the form of the transfer structure and is not modified in any way, which means that if the data contained errors in the source system, it may still contain errors. When you load flat files, the data does not remain completely unchanged, since it may be modified by conversion routines (for example, the date format 31.12.1999 might be converted to 19991231 in order to ensure the uniformity of the data). You can check the quality of the requests, their usefulness, the sequence in which they are arranged, and how complete they are.
At the same time, the PSA delivers the backup status for the ODS (until the total staging process is confirmed) and improves the loading performance by uncoupling the loading process from further processing in BW. The operational system is not overloaded if errors do not appear until the data is processed further.
For direct updates in InfoCubes, data is stored in the PSA for the medium term, since the data can still be used to refresh InfoCubes. However, for updates to ODS objects, data is stored only for the short-term.
http://help.sap.com/saphelp_nw04/helpdata/en/44/b21f98be886a45a4bb7e123e86e4c2/frameset.htm
http://help.sap.com/saphelp_nw04/helpdata/en/44/b21f98be886a45a4bb7e123e86e4c2/frameset.htm
Thanks
Reddy

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VCHAR       3661                    70285738            6692569 20              RLE
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Attachments:
Test Event.vi ‏11 KB

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Hi,
in deleting the records in PSA table difficult and how many you will the delete.
you can achieve the different ways.
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Hi,
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http://help.sap.com/saphelp_nw04/helpdata/en/52/1ddc37a3f57a07e10000009b38f889/frameset.htm
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Hi
I have a query related to the Output type .
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Requirement Use
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P.S. Reward points for all helpful answers.

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The purpose of a PSA ?

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