Basic modeling question
Hi all,
I would like to allow reporting of some system logs stored in database tables (header and item) in BW.
I have the choice of storing it in an ODS object or an InfoCube.
Storing them in an ODS object is the first option I could think of, but since I expect users to slice and dice with the data in reports, I am tempted to use an InfoCube with appropriate dimesions designed.
Having said that, I am not still not sure how slice and dice with an InfoCube is faster in this scenario as I will be able to store all data in one flat table in an ODS. With some secondary indexes I should be able to get good performance.
I am not completely sure which approach is correct. Could some one throw some more light on this?
Regards,
Girish
The decision to do reporting out of an ODS or cube really depends on a ouple of things. I don't think that it needs to be avoided, and could be your best option, but really depends on the data and the queries.
If the data will be looked at in summarized form only, cube would be good - that's one of the cube's strengths. If you need to always see the detail, an ODS might be best. Another factor that might lean me to choose an ODS is if the querying is very specific, e.g. just one or only a few queries, and the selection criteria (so you can build indices)is fairly constant.
A cube might be better if you have many characteristics and the selection criteria will vary a lot - having bitmap indices and using a star transformation (I'm assuming Oracle here) can really help when the queries tend to use a variety of criteria from one run to another.
Nothing says you can't use both, if you need to suport both summarized and detail querying, and use RRI to jump from a summarized result from the cube to underlying detail in the ODS.
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