How long do you keep data in PSA ? (SAP NetWeaver BI 7.0)

Hello gurus,
According to your expertise, do you consider that PSA must keep data for a long time ? Or should it be set to empty after a short time (one month for instance).
If we consider that PSA must not keep data for a long time, how do you let your clients access old data (for instance, results of 2005 that are accessed rarely) ? Do you create another cube with old data, compressed, with aggregates ...
I have investigating archiving, but this option does not fit because we want to be able to access the data at any time, even very rarely..
Any feedback on the topic is appreciated.
Best regards,
Vanina

Hi Vanina,
How long you save your PSA is depending on the load frequency and the way you load:
e.g.
- Daily full load: one week will be enough
- Daily delta: depending on the possibilities to repair/ to run a new init. If a repair is difficult or a init takes a lot of time (billions of records) keep your PSA for  90 days.
Also the time the business needs to "discover" errors is important. If they run monthly reports, don't delete the PSA on weekly basis.
If you load data from flat files or other sources that cannot be easily recovered: save PSA "forever".
Cubes with a lot of data can be split into "Yearly" cubes. Run reports with only recent data direct on the cube. reports with this and last year on a multi-cube. (you can even make another multicube for all the years. Compress cubes once they are not filled anymore.
Yearly cubes can also partitioned (menu --> extra's --> DB performance --> partitioning)
Hope this helps.
Udo

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