Are you sure that named graphs have better performance?
I'm not a specialist, and I'd like to know other users' opinion about that
question. I thinks it depends both on the structure of your data and the
queries you run.
My use case consisted in using a dataset with +/- 168 M triples,
Be very careful using vmtouch especially if you call -dl as you could very
easily and quickly kill a system. I've used this tool on cloud VM's to
mitigate cycle times, think DBAN due to public nature of hardware. It's a
fast way to an irked OS thrashing around.
Dick
On Sun, 16 Dec 2018 19:57
I'll be happy to document this. I think FAQ would be a good place.
I actually looked further into this and found that the vmtouch
functionality is provided in the jdk itself.
java.nio.MappedByteBuffer#load method will bring file pages in memory [1].
The way it works is similar to vmtouch, i.e.
Sorry , I sent a bad link on the list, my assembler file is really this:
https://github.com/jmvanel/semantic_forms/blob/master/scala/jena.spatial%2Btext.assembler.ttl
Le dim. 16 déc. 2018 à 13:40, Marco Neumann a
écrit :
> you are missing the text index in the assembler.
>
> On Sun, Dec 16,
This seems to be a Linux-only technique that relies on installing and
maintaining vmtouch, correct?
It doesn't seem that we could support that as a general solution, but would you
be interested in writing something that gives the essentials up for someplace
in the Jena docs? I'll admit I'm not
you are missing the text index in the assembler.
On Sun, Dec 16, 2018 at 12:08 PM Jean-Marc Vanel
wrote:
> Yes indeed,
> exactly with this assembler file:
>
> https://github.com/jmvanel/semantic_forms/blob/master/scala/jena.spatial.assembler.ttl
>
> And, when the Jena based application is
Yes indeed,
exactly with this assembler file:
https://github.com/jmvanel/semantic_forms/blob/master/scala/jena.spatial.assembler.ttl
And, when the Jena based application is started with this same assembler
file, the spatial queries work , as said above in this thread.
Le dim. 16 déc. 2018 à
yphu,
you didn't share your query.
Maybe the query have questionable features.
Did you try a simple but useful query, like getting the first 10
foaf:Person ?
Le ven. 7 déc. 2018 à 15:53, y...@zju.edu.cn a écrit :
> Dear jena,
> I have built a graph with 1.4 billion triples and store it as a
did you create the text index with jena.textindexer
--desc=//config.ttl?
On Sun, Dec 16, 2018 at 8:48 AM Jean-Marc Vanel
wrote:
> I fixed a stupid error in text index URI, resulting from pasting, in new
> file jena.spatial+text.assembler.ttl:
>
>
In-memory database has following limitations :
1) Time to create the database. Not a problem if you have a dedicated
machine which runs 24/7 where you load data once and the process never
exits. But a huge waste of time if you get hardware during certain time
slots and you have to load data from
I fixed a stupid error in text index URI, resulting from pasting, in new
file jena.spatial+text.assembler.ttl:
https://github.com/jmvanel/semantic_forms/blob/master/scala/jena.spatial%2Btext.assembler.ttl
Now, it reads:
:spatial_dataset rdf:type spatial:SpatialDataset ;
rdf:type
So I tried a new file jena.spatial+text.assembler.ttl with separate Lucene
indices for spatial and text:
https://github.com/jmvanel/semantic_forms/blob/master/scala/jena.spatial%2Btext.assembler.ttl
It defines a Dataset with both Dataset types and both Lucene indices:
:spatial_dataset rdf:type
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