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Performance

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F. Conrads edited this page Jan 18, 2018 · 4 revisions

Very Simple Queries such as

SELECT  ?type ?prop ?val  WHERE    
{ 
  <http://data.semanticweb.org/organization/yahoo-research> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> ?type . 
  <http://data.semanticweb.org/organization/yahoo-research> ?prop ?val    
}

have a very good performance as you can see in the following table (the benchmark only contains such simple queries. nrapheval.png

Problematic Queries as the following one, took up to 9s on a 300.000 triples Semantic Web Dog Food dataset (not in the upper benchmark)

PREFIX  geo:  <http://www.w3.org/2003/01/geo/wgs84_pos#>  
PREFIX  swrc: <http://swrc.ontoware.org/ontology#>  
PREFIX  ical: <http://www.w3.org/2002/12/cal/ical#>  
PREFIX  rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#>  
PREFIX  owl:  <http://www.w3.org/2002/07/owl#>  
PREFIX  swrc-ext: <http://www.cs.vu.nl/~mcaklein/onto/swrc_ext/2005/05#>  
PREFIX  dcterms: <http://purl.org/dc/terms/>  
PREFIX  rdfs: <http://www.w3.org/2000/01/rdf-schema#>  
PREFIX  foaf: <http://xmlns.com/foaf/0.1/>  
PREFIX  swc:  <http://data.semanticweb.org/ns/swc/ontology#>  
PREFIX  dc:   <http://purl.org/dc/elements/1.1/>  

SELECT  ?title ?year  WHERE    
{ 
  ?x rdf:type swrc:InProceedings .      
  ?x dc:title ?title .      
  ?x swrc:abstract ?abstract .      
  ?x swrc:year ?year .      
  ?x dc:creator ?creator    
}

Problem: ?x is very specific but the current planner does not use this information.

API

If you need a triple store just for your application you can add the ngraphstore.query api to your project and use the DefaultSPARQLProcessor. This will be much faster than the actual REST API provided.

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