On 8 September 2017 at 10:11, George News <[email protected]> wrote:
> Hi, > > Is multiunion only linking the graphs or copying them in a new graph? > > I'm thinking on splitting a huge graph on many simple ones and them > making the union depending on the part of the main graph that has to be > requested, therefore limiting the scope of the sparql and speeding > things up. But if multiunion copies, then I don't think I will speed > things. > If things haven't changed too much ... (a) it links the graphs. They are not copied. Hooray! (b)ut when you run an operation over the graph that delivers a set of triples (which is how queries work over union graphs) it has to remember all the triples it has already seen so that it doesn't deliver duplicates. Hence (depending on the triple pattern being used) may mean lots of store being held onto. Alas! Chris -- "What I don't understand is this ..." Trevor Chaplin, /The Beiderbeck Affair/ Epimorphics Ltd, http://www.epimorphics.com Registered address: Court Lodge, 105 High Street, Portishead, Bristol BS20 6PT Epimorphics Ltd. is a limited company registered in England (number 7016688)
