> I haven't looked at exactly how the optimizations work. Might the SDB and
> TDB models be even faster than purely in-memory models?
This might be the case with TDB, where you can instruct TDB to use some
optimizations based on statistics.
http://openjena.org/wiki/TDB/Optimizer
These optimizations may not be available with in-memory models. With these
statistics in place, the engine can re-order clauses in SPARQL queries.
But if you have written your SPARQL/SPIN queries intelligently (with the best
ordering of clauses) then this would not matter, and the optimization step
might even be a waste of time.
Holger
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