On 21/07/13 14:04, Davide Rossi wrote:
Hi everybody,
I have two large datasets, each of which is about 2GB of memory. Now, I
have to query both datasets in one single query because the informations I
have to retrieve are divided in these datasets so I have to navigate their
union. The problem is that I have only 1GB of memory on my JVM so when I
try to do
firstDataset.addNamedModel("second", secondModel)
What kind of dataset are you using? Some don't copy at this point,
some do.
or
firstModel.add(secondModel)
I have an OutOfMemoryError. So, I would like to know if is possible solve
this memory problem avoiding store all the informations in only one dataset
(I must store the informations in two datasets).
Thanks for your answers
regards
Davide
Do you mean in two graphs rather than two datasets? An RDF dataset is
itself a collection of graphs.
If you are running out of memory, then you probably want to consider
using a database to store the data.
See TDB:
http://jena.apache.org/documentation/tdb/index.html
Andy
