Regarding PSA real time scenarios and things

Question

Hai
I knew abour PSA therotically . But i want in detail real time scenarios concering about PSA . Like , if data laoding is failed then how to look at PSA and after identifying how to update to corresponding datatarget like this ......
So please tell in detail some real time scenarios about PSA and also send some documents or weblogd or old forums to [email protected] now
I ll assign the points for thanks
bye
mohammed

Answer 1

hi chakri, go through this.
1.The Persistent Staging Area (PSA) is the inbound storage area for data from the source systems in the SAP Business Information Warehouse. 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, as is the case with Info Cubes.
2. The data records in BW are transferred to the transfer structure when you load data with the transfer method PSA. One TRFC is carried out per data package. Data is written to the PSA table from the transfer structure, and stored there. A transparent PSA table is created for every transfer structure that is activated. The PSA tables each have the same structure as their respective transfer structures.
3. The number of fields is limited to a maximum of 255 when using TRFCs to transfer data. The length of the data record is limited to 1962 bytes when you use TRFCs.
4. Four types of updates a) psa and data targets parallel b)psa and data targets serially c) only psa with subsequent updates to data targets d) only data targets
5.Since the data is stored in transparent tables in database we can edit the data in psa using  ABAP routines using PSA-API’s.
6. u can delete the requests from the PSA  for the incorrect data provided that the concerned request data is not populated into data targets.
7. table for PSA:There is only one table for all psa requests.One way to know the psa table name is by right click the psa node and 'maintain export datasource', you will see the table name is /BIC/B0000xxxx (System generated psa table name ) ('ExtractStru.') with se16 you can see the contents, each request no. displayed in field REQUEST.
8. reporting:  We can not report directly on psa  as the  same data is coming form the source system we can see a report from the source sytem. How ever technically speaking we can have a report on that. You are creating an export datasource on it and report using a Remotecube. you could even create an ODS with the same structure of the PSA and push the PSA data into it with no data transformation and then report. When u create an export data soruce on psa it will start with 7 followed by ur  PSA name. The below link gives the reporting on psa document.
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/968dab90-0201-0010-c093-9d2a326969f1
Re: Reporting on PSA
Reporting on PSA
9.Changelog and PSA: If we delete data in changelog the data in psa will not be deleted. You have to delete the data in the PSA exclusively.The change log acts as the PSA for the data target if the ODS acts as a datasource. What I mean is if the ODS supplies to another cube/ODS then the source ODS's Changelog is the PSA for the target ODS/Cube.
10.PSA as a data source:   create an export data source. The export data source starts with 7 followed by psa name.  Go to data marts in the info sources tab and replicate that data source.  Create an info source and assign this data source.  Activate transfer rules and communication structure Then create a data package  and schedule the load to the data target.
11.PSA deletion:
  Re: PSA Deletion
12. PSA data in EP:
Re: urgent: PSA Data in EP?
13.Deleting PSA data source:
To delete the export data source
Just go to RSA6 and find the your datasource in the node 'DM', click once (highlight it) and there is a delete icon on the standard icon bar, click on that you should be able to delete the datasource.
Delete PSA datasource
  14.Debug load inpsa:
Re: How to Debug a Load into PSA    
to load data manually from psa to the data targets.
1. go to rsal .ie administrator work bench
2. under modelling tab choose psa option
3.select your application component
4. choose ur info soruce and expand the tree to see the requests
5. double click on the psa icon
6. a new screen will appear which asks for the no of records to enter give the number and press enter u can see the data in the psa
7. to update psa data manually go to the context menu  of that request and select the optio "update date immeditatley" it will be  loaded to the data target/
cheers
ravi
dont forget to assign points that is the way of saying thanks in sdn