Instant query results - possible?

I just want to get general idea on query response (Bex)
Usually client expectations is they would be instanteneous.  That rarely happens, I know I could do pre-calculation, use indexes and have aggergates and use cache properly besides having a good data model
But still I doubt that queries would be instantenous.
What is general experience on this forum.
Please share your experiences.. Thanks

Within the Data Warehousing Industry it is generally accepted that response times for data warehouse queries is not instantaneous.  This expectation generally comes from experiences with OLTP system (R3) where the processing is vastly different.
That does not go to say, however, that instantaneos response time cannot be acheived for specific reports.  The more one knows about the report requirements the more it is possible to tune. 
However, for data warehousing in general, especially ad-hoc types of reporting, it would be prudent for you to try to manage your users, and your Mangements's expectations to help them understand that R3 and BW are very different animals and the same performance for R3 should not be expected for BW, in general.

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