Stack Overflow
Stack Overflow

Questions tagged [graphdb]

Ontotext GraphDB is a semantic triplestore: a database for RDF and OWL data. Use this tag for questions specifically about the Ontotext GraphDB product. For questions that are about graph databases in general (or about other graph database products), use the [graph-databases] tag instead.

In essence, GraphDB™ is a “semantic repository” using ontologies that allow the repository to automatically reason about the data. It works with a flexible and generic physical graph data model allowing for easy interpretation and adoption of new ontologies or metadata on-the-fly. GraphDB™ is packaged as a storage and inference layer (SAIL) for Sesame. Sesame is one of the most popular semantic repositories that supports RDF(S) and all the major syntaxes and query languages related to it. GraphDB is fully SPARQL 1.1 compliant. You can read more about GraphDB™ here. The full documentation can be found here.

Related tags

519 questions
1
vote
1 answer

Ontotext GraphDB Repository cannot be used for queries

I am getting an error message while trying to sparql in a particular repository. Error : The currently selected repository cannot be used for queries due to an error: Page [id=7, ref=1,private=false,deprecated=false] from pso has size of 206 != 820…
Alwin C Alias
  • 21
  • 3
1
vote
1 answer

How to increase max header size for GraphDB standalone server?

I have started graphdb with the following call: /usr/local/graphdb-free-9.4.0/bin/graphdb -Xms60g -Xmx60g -Dgraphdb.connector.port=7200 -s When accessing over HTTP, some of the longer queries generate 400 errors: Type Exception Report Message…
mkk
  • 879
  • 6
  • 19
1
vote
0 answers

Clearing a named graph in GraphDB free is slow

Clearing a named graph with many triples through rdf4j with clear(context) function is slow. Even, manually deleting a named graph through the graphdb interface http://localhost:7200/graphs is slow. I tried to play with the JVM memory according to…
zoe vas
  • 281
  • 9
  • 25
1
vote
1 answer

Cannot initialize a graphdb repo with a SHACL Sail

Set up a current graphdb free (tried with 9.3.3 and 9.4.0) create a new repository in the workbench that has SHACL validation enabled export it to ttl set it up as an init repository that graphdb imports upon startup observe that graphdb startup…
fkleedorfer
  • 525
  • 4
  • 8
1
vote
1 answer

How to upload rdf-file to GraphDB over API

I have an RDF-file stored on my server. The file or at least the file-content should be uploaded to a remote GrapbDB over API. On the documentation there are two ways to do this. The first one is uploading it to server files and then loading it to…
Gigalodon
  • 51
  • 1
  • 8
1
vote
2 answers

How can i set the heap size in GraphDB? (Standalone Server)

I want to configure the heap memory size but it's not clear for me, from the documentation. It says: You can control the heap size by supplying an explicit value to the startup script such as graphdb -Xms10g -Xmx10g or setting one of the following…
ilmav
  • 13
  • 4
1
vote
0 answers

SPARQL* DELETE/INSERT returning error when using nested triples within where clause

why is it not allowed to include a nested triple like <> ?x ?y within the where clause of a insert/delete statement. It immediatelly returns an 500 error. Following simple statement returns this error. delete { } insert { …
Greenfish
  • 358
  • 2
  • 5
  • 19
1
vote
0 answers

Visualization problem in #graphdb : This node has no visible connections

I'm using graphdb to visualize connections between my nodes, but when I used visual graph and I tape an IRI, a single node appear although I know it has several connections but they do not appear. Architecture screenshot: Node screenshot]:
Y_B
  • 11
  • 1
1
vote
4 answers

Other reconciliation services in GraphDB

I have been looking for reconciliation services with ontorefine in graphDB. In the following link https://medium.com/wallscope/linked-data-reconciliation-in-graphdb-cd2796d2870b reconciliation is performed with the DBpedia endpoint. I want to…
Jenny Fer
  • 21
  • 1
1
vote
0 answers

How do I modify the defaul graphdb.home directory?

I have installed GraphDB Free v9.3 in LinuxMint 19.3. The workbench is running fine though I haven't created any repositories yet. This is because I have noticed that although the application is installed at /opt/graphdb-free, the data, conf and…
Ian Piper
  • 45
  • 1
  • 8
1
vote
2 answers

GrapdDB query with json-LD output

is it possible to use GrapdDB to create a curl SPARQL query with json-LD output (no export)? Which parameter do I have to insert in the URL? thank you in advance
mr_sol
  • 241
  • 1
  • 3
  • 7
1
vote
2 answers

error " org.eclipse.rdf4j.sail.SailException: Invalid IRI value "

I have problem when i try to import my RDF file org.eclipse.rdf4j.sail.SailException: Invalid IRI value as in the image: https://i.stack.imgur.com/Gcx6L.png
tshaqura
  • 21
  • 3
1
vote
1 answer

Accessing GraphDB Workbench throught the internet (not localhost) in a Nginx server

I have GraphDb (standlone server version) in Ubuntu Server 16 running in localhost (with the command ./graphdb -d in /etc/graphdb/bin). But I only have ssh access to the server in the terminal, can't open Worbench in localhost:7200 locally. I have…
Paulo Martins
  • 110
  • 10
1
vote
1 answer

Elasticsearch connector and owl:sameAs on graphdb

im using ruleset OWL-RL optimized and using elasticsearch connector for search. All i want is to recoginize the entity has same value and merge all values into one document in es. Im doing this by: Person - hasPhone - Phone and have…
david backa
  • 19
  • 3
1
vote
3 answers

How can implement data mesh concept data engineering product or application

I am trying to implement data mesh concept in a business related application. Let me describe first: Already used data HDFS, hive and cassandra_database to manage data. 1: According to my knowledge, in data mesh concept multiple databases,…
Bimal Kumar Dalei
  • 196
  • 5
  • 14
1 2 3
…
34 35