Best Practice storage of OLAP and ROLAP data

Hi all,
We are looking at building OLAP cubes based on our our existing relational datawarehouse . Should we just build OLAP cubes in another schema on the existing datawarehouse database or are there fundamental reasons for not storing the OLAP cubes on the same database or machine as the sourced data i.e A datawarehouse star schema.
There is very little activity on this database during daytime after all the ETL's are completing overnight so I cant see any reason to have another machine and database just for the OLAP cubes. Any comments of why this would be a good idea ??
Thanks for any comments,
Brandon

Hi Jos,
Thanks, had a squizz, looks like it needs its own tablespace (preferably stripped across multiple disks) and undo and temp need to be examined to be a suitable config. No mention of a separate box.
Cheers

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I'm hoping that for SHPCON there is no dependency in the IDoc processing (i.e. it's not important if they're processed in the same sequence or not), otherwise it'd add another complexity level.
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