Performance problem when a direct IO option is selected

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  1. have there been recent changes to the computer before the show?

  2. this happens to you when you work on any specific application?

  I suggest you follow the given steps and later a update on the State of the question.

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  Edited by: 860605 09/19/2011 18:58
  
  Published by: 860605 on 19/09/2011 19:00

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  Hello
  
  We run into performance problems when you use queries SEM_MATCH.
  
  We have a model for data (ABox) containing a triple 12 000 000.
  We have a model for the plan (TBox) containing 800 triple.
  We ran an implication of "OWLprime" and built the model and entailment index with the SEM_APIS commands.
  
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  64-bit operating system.
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  Here are the results:
  
  
  1. single template query using index of inference:
  SELECT
  
  x
  TABLE)
  SEM_MATCH (' (? x < http://www.we.com/weo.owl#has_symptom > < http://www.we.com/weo.owl #allergyA >)',)
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  2.
  a.Double query model using index of inference:
  SELECT
  
  x, y
  TABLE)
  SEM_MATCH (' (? x < http://www.we.com/weo.owl#has_symptom > < http://www.we.com/weo.owl #allergyA >))
  
  +(?x RDF:type <http://www.We.com/WEO.Owl#patient>) +.
  
  + (? x < http://www.we.com/weo.owl#id >? y)', +.
  SEM_Models ('TOM_ONTOLOGY', 'TOM_ONTOLOGY_TA'),
  
  SDO_RDF_RULEBASES ('OWLPrime'), NULL, NULL, NULL)
  +);+
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  b. double model query without indication of inference:
  SELECT
  
  x, y
  TABLE)
  SEM_MATCH (' (? x < http://www.we.com/weo.owl#has_symptom > < http://www.we.com/weo.owl #allergyA >))
  
  +(?x RDF:type <http://www.We.com/WEO.Owl#patient>) +.
  
  + (? x < http://www.we.com/weo.owl#id >? y)', +.
  SEM_Models ('TOM_ONTOLOGY', 'TOM_ONTOLOGY_TA'),
  
  NULL, NULL, NULL, NULL)
  +);+
  Execution time: 2.5 seconds
  
  
  3.
  a. triple query model using index of inference:
  SELECT
  x, y, z
  TABLE)
  SEM_MATCH (' (? x < http://www.we.com/weo.owl#has_symptom > < http://www.we.com/weo.owl #allergyA >))
  (? x rdf:type < http://www.we.com/weo.owl#patient >)
  (? x < http://www.we.com/weo.owl#id >? y)
  (? x < http://www.we.com/weo.owl#gender >? z)',
  SEM_Models ('TOM_ONTOLOGY', 'TOM_ONTOLOGY_TA'),
  SDO_RDF_RULEBASES ('OWLPrime'), NULL, NULL, NULL)
  );
  
  Running time: 146 seconds
  b. triple query model without using the index of inference:
  SELECT
  x, y, z
  TABLE)
  SEM_MATCH (' (? x < http://www.we.com/weo.owl#has_symptom > < http://www.we.com/weo.owl #allergyA >))
  (? x rdf:type < http://www.we.com/weo.owl#patient >)
  (? x < http://www.we.com/weo.owl#id >? y)
  (? x < http://www.we.com/weo.owl#gender >? z)',
  SEM_Models ('TOM_ONTOLOGY', 'TOM_ONTOLOGY_TA'),
  NULL, NULL, NULL, NULL)
  );
  
  Execution time: 9 seconds
  
  Thank you
  
  Doron

  If you use 11.1.0.7.0 and you have installed the 7600122 hotfix, please use:
  -Brace for the SEM_MATCH query syntax
  -Virtual model (using SEM_Models ('TOM_ONTOLOGY', 'TOM_ONTOLOGY_TA'),
  SDO_RDF_RULEBASES ('OWLPrime'))
  -ALLOW_DUP = T (as part of the parameter options of SEM_MATCH)

  For more details, please see
  http://download.Oracle.com/docs/CD/B28359_01/AppDev.111/b28397/sdo_rdf_newfeat.htm

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