All I have added a new TDB FAQs page to the website - http://jena.apache.org/documentation/tdb/faqs.html - which answers a number of questions I see frequently asked on the mailing lists. The idea is that it is a resource we can point users at rather than answering the same questions repeatedly
I've added four questions I frequently see but I suspect there are others that could do with adding e.g. how to choose heap size, how far does TDB scale, why does reasoning perform slowly against TDB etc Please go ahead and add answers for these or other frequently asked questions that you see Cheers, Rob