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I am trying to estimate the time that is needed to use 2 Exalytics machinesHow long is a piece of string ...
in combination with OBIEE. What is the extra effort required?
I assume the in-times database will be used by the BI server automatically.Nope.
The extra effort is the new hardware/software.Without wanting to sound too rude, you might want to factor in some Exalytics training too :-)
The big change it the ETL Source->DWH->in times->bi server->app.
Does that make sense?
Are there any work items that I have missed?
Exalytics can be used in many ways. At the very basic level, you can just use it as a very very big powerful server on which you run OBIEE - just as any other OBIEE server. Of course, that's a waste of the power of the box, but it's an option.
If you want to start putting aggregates in-memory with TimesTen then you need to build them and integrate them into OBIEE's RPD. One option is tools such as the Summary Advisor and Aggregate Persistence. Another option is to build the TimesTen aggregates yourself and plumb them into the RPD manually.
Here are some links to get you going: