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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.

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How group patterns are evaluated/joined in SPARQL

I am wondering how group patterns are evaluated in SPARQL. My assumption was that each group pattern is evaluated separately, then solution bindings from groups are joined together. However, it seems not to be the case. Let's take this example…
Median Hilal
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How to filter by BlankNode id

I'm trying to run this query in the SPARQL playground on GraphDB. select * where { ?s content:value ?value . FILTER REGEX(str(?value), "_:x1697BD364N0abcdd866d54") } ?value are BNodes I'm trying to filter all values where the BNode ID is:…
ueeieiie
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NetworkX vs GraphDB: do they serve similar purposes? When to use one or the other and when to use them together?

I am trying to understand if I should use a GraphDB for my project. I am mapping a computer network and I use NetworkX. The relationships are physical or logical adjacency (L2 and L3) . In the current incarnation my program scans the network and…
MiniMe
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SPARQLWrapper QueryBadFormed error for long SELECT query

Is there a limit on the size of the query you can use with with a SELECT query? I have a long SELECT query (posted below) that keeps throwing a QueryBadFormed error. I have validated the query on sparql.org and I have ran the query on the triple…
Bill
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GraphDB OutOfMemoryError: Java heap space

I'm using GraphDb Free 8.6.1 in research project, I'm running it with default configuration on linux server having 4GB memory in total. Currently, we execute quite many CRUD operations in tripplestore. GraphDB throwed exception in…
Peter Kostelnik
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How to properly configure GraphDb memory

I'm using GraphDb Free 8.6.1 in research project, I'm running it with default configuration on linux server having 4GB memory. However, it has started to throw exceptions pointing to insufficient memory: Caused by:…
Peter Kostelnik
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GraphDB - very slow sparql query with two connections

My database has information about documents, where each document has a category, e.g. PREFIX rdfs: PREFIX: :doc1 :hasCategory :category1 . :category1 rdfs:label "Law" . There are about…
user888734
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owl:functionalProperty & owl:differentFrom

I'd be grateful for some help on what I'd assumed was a very simple scenario; but being a relative newcomer to OWL and GraphDB I may have made some basic error. I have a very simple Turtle-specified OWL example as follows: @prefix rdf:…
wabrit
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Ontotext GraphDB process terminates

I have graphDB 8.0.2 running on an Ubuntu server. I run it with /var/lib/graphdb/bin/graphdb -Xmx1224M -Xms712M &. The graphdb process stops with no reason. I don't see any errors in the logs (see below). What could be the reason for this ? How can…
ThomasFrancart
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SPARQL Speed up federated query

I have my own dataset and I want to perform a federated query in SPARQL. Here is the query: PREFIX : PREFIX wd: PREFIX xsd: PREFIX p:…
floatingpurr
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Text search in GraphDB web interface?

Is there a text search accessible through the GraphDB web interface, like there is for Blazegraph, Stardog, and Virtuoso faceted search? For example: I have gone through the Lucene connector and full-text exercises. I see how I can write a SPARQL…
Mark Miller
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GraphDB's Visual graph does not display all triples

In my graph I have the following assertions @prefix : . @prefix foaf: . @prefix rdf: . :joesmith a foaf:Person ; …
floatingpurr
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using contexts for multiple data sets in graphdb repo

I am working on research project in which are studying the success of tooth restoration procedures (i.e., fillings). We are collecting data from a number dental practices, and we are going to aggregate all the data into a GraphDB triple store. My…
Bill
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GraphDB sparql endpoint unavailable via sesame / rdf4j SPARQLRepository interface

We are using the RDF4J (formerly sesame) framework to run sparql queries to a remote GraphDB triple store. This works successfully through the rdf4j HTTPRepository interface, which takes the Graphdb server's URL and the repository ID, but fails when…
Riccardo Santoro
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Run GraphDB behind Apache Proxy

I run grapdb as a standalone server. The service starts on http://localhost:7200. I need to configure an Apache redirect to graphDB workbench, to access it through port 80 : ProxyPass /graphdb http://localhost:7200 ProxyPassReverse /graphdb…
ThomasFrancart
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