[Owlim-discussion] BigOWLIM configuration

[Peter Kostelnik, PhD.]

hi there ..

I'd like to ask for the hints, how to configure BigOWLIM for the best
possible performance in run-time ..

there is a couple of parameters which (I believe) can improve the
triple-store performance, so my question is, how to set them to achieve
the best ..

our setup is as follows:
---
approx. number of statements: for sure more than 100 millions (pls, how
affect the copying the same graphs of statements into more different
context? are they copied to as different squads or there is just the kind
of association of same statements to the different context URIs?)

we are about to use the RDFS reasoning, but in most of cases (in this
moment - in all cases) for now we don't use the reasoning at all yet..

right now we don't use the rules

we are firing the SPARQL queries, we are also using the
RepositoryConnection instances to retrieve the data ..


we are running the two different scenarios:
---
scenario 1: off-line load of all data
this is done only once - the very first load of the data into triplestore ..
we are using two instances of Repository, first for loading the data,
second for post-processing ..
first instance is initialized, all data are loaded into the triple-store
in a single transaction commited after the load is finished .. when
loading, the snippets of data are parsed and stored into more separate
contexts ..
after the loading is finished, there comes the huge post-processing .. so
first repository is shutted down, and post-processing repository is
initialized .. it does the work and it is shutted down - data are in
triple-store ..
loaded data are moved to the production system (running as BigOWLIM under 
sesame server) ..

scenario 2: run-time
---
BigOWLIM is accessible remotely using HTTPRepository, handling the lots of
queries and searches ..

pls, do you have some hints, how to squeeze the best from BigOWLIM?
if talking about the RAM, can you, pls - if possible - draw possible
alternatives for several setups (<- just curious what effect has this
parameter (sure, I know - the more the best :) ))?

thanks a lot in advance, cheers,
                                 Peter K.



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