Can data be purged without the archiving process in BW system?

Dear all,
can anybody give me some comments on the data purging process? After checking some materials about BI data archiving, I am wondering:
if data can be purged skipping the archiving process? As long as no requests to retain the historical data, it should be good for performance reason to purge some useless data.
My doubt to this question is:
1. Will there be any inconsistency if we do the data purging manually without instruction of SAP standard process?
2. Will there be any particular issues for DSO and Cube data purging? Since there should be some business related dependencies.
It would be highly appreciated for sharing the best practice in data purging or archiving in BW system!
thanks in advance!
Jennifer

Hi,
as others are pointing you should never delete data with other means than SAP standard procedures (request, selective, archiving....); in other words, do not delete data directly from the the BW DB tables!! This would definitively lead to big troubles... I am not sure what you mean exactly by "manually"...
Deleting data (purging and or archiving) should always been considered carfully:
- is the cube/dso a source of data for other targets (datamart)? If this is the case then the deletion should be carefully analyzed
- for DSO/ODS it is particularly important to ensure that the keys of the records to be deleted will never be loaded again in the DSO; because of the overwrtie capabilities for these containers, this situation will obviously lead to incorrect data posted in subsequent targets
Currently we've never used the archiving functionalities of BW... We monitor closely the data genererated by BW itself in datamart scenarios (PSA in between providers can grow very fast) and have implemented a customized process for that since it wasn't possible to archive PSA in BW3x....
Most of the data stored in our providers are still used by our consummers (six years of data, some 3TB) and we use the logical partitionning extensively on the calendar year; this enable us to "move" "old" data to less expensive storage line.
hope this helps....
Olivier.

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