ESRI ArcSDE application

We're working on an ArcSde migration from sqlserver to oracle. i believe the 
version is 8.2
i was wondering if  anyone had  any gotchas  or  any information that we shoudl 
know. mind you the consultant we have  has no clue of either unix nor  oracle.
Also the consultants are recommending installing app on the database server  
instead of  an app server. This is something i dont like and if anyone has done 
so reason why is it necessary ?.
 
 
 
Thanks 
 
Fuad Arshad

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