Billion-triple store

[Leif Johansson]

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> I have done a couple of experiments with a totally brain-dead (probably)
> schema on a single node with {n_fragments, 1000}. I can insert ~250k
> statements at a sustained rate of ~2300 statements per second using
> disk-copies of everything and a transaction per statement. The resulting
> mnesia disk db is ~55M from a 25M n3 file turned into erlang statements
> using perl :-)
> 
> Stay tuned...
> 
> 	Cheers Leif

I created a new schema which reduces the database size at the price of
a ~40-50% reduction in insertion speed. I have only tried small graphs
of about 100k - 1M triples. At these sizes I get ~1500 insertions per
second sustained on my P4 mobile laptop. The resulting mnesia db using
100 frags for the two tables is ~ 110M in size.

I am going to setup a bigger test now...

	Cheers Leif
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