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POOptimization of SPARQL query. [ Estimated execution time exceeds the limit of 1500 (sec) ]
 

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    <p>I am trying to run this query on <a href="http://dbpedia.org/sparql" rel="nofollow">http://dbpedia.org/sparql</a> but I get an error that my query is too expensive. When I run the query trough <a href="http://dbpedia.org/snorql/" rel="nofollow">http://dbpedia.org/snorql/</a> I get: </p> <pre><code>The estimated execution time 25012730 (sec) exceeds the limit of 1500 (sec) ... </code></pre> <p>When running the query through my python script using SPARQLWrapper I simply get an HTTP 500.</p> <p>I figure I need to do something to optimize my SPARQL query. I need the data for iterating over educational institutions and importing it in to a local database, maybe I am using SPARQL wrong and should do this in a fundamentally different way.</p> <p>Hope someone can help me!</p> <h1>The query</h1> <pre><code>PREFIX owl: &lt;http://www.w3.org/2002/07/owl#&gt; PREFIX rdf: &lt;http://www.w3.org/1999/02/22-rdf-syntax-ns#&gt; PREFIX foaf: &lt;http://xmlns.com/foaf/0.1/&gt; PREFIX xsd: &lt;http://www.w3.org/2001/XMLSchema#&gt; PREFIX rdfs: &lt;http://www.w3.org/2000/01/rdf-schema#&gt; PREFIX dc: &lt;http://purl.org/dc/elements/1.1/&gt; PREFIX : &lt;http://dbpedia.org/resource/&gt; PREFIX dbpedia2: &lt;http://dbpedia.org/property/&gt; PREFIX dbpedia: &lt;http://dbpedia.org/&gt; PREFIX skos: &lt;http://www.w3.org/2004/02/skos/core#&gt; SELECT DISTINCT ?uri ?name ?homepage ?student_count ?native_name ?city ?country ?type ?lat ?long ?image WHERE { ?uri rdf:type dbpedia-owl:EducationalInstitution . ?uri foaf:name ?name . OPTIONAL { ?uri foaf:homepage ?homepage } . OPTIONAL { ?uri dbpedia-owl:numberOfStudents ?student_count } . OPTIONAL { ?uri dbpprop:nativeName ?native_name } . OPTIONAL { ?uri dbpprop:city ?city } . OPTIONAL { ?uri dbpprop:country ?country } . OPTIONAL { ?uri dbpprop:type ?type } . OPTIONAL { ?uri geo:lat ?lat . ?uri geo:long ?long } . OPTIONAL { ?uri foaf:depiction ?image } . } ORDER BY ?uri LIMIT 20 OFFSET 10 </code></pre>
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