Not in the concepts guide, but this article is quite enlightening and written by one dude that knows his Oracle Index stuff pretty darn well too:
http://richardfoote.wordpress.com/2008/04/16/separate-indexes-from-tables-some-thoughts-part-i-everything-in-its-right-place/You should also browse the recent posts as there are several others that may provide some helpful insights to the questions you'll likely have after reading this first article. Good reading from what I've seen so far there.
Dan Rick Ricky wrote:
i was talking to someone about this today. I cannot remember where in the Concepts document that it says that separating data from indexes improves performances?
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