• Facets (new session)
• Description
• Metadata
• Settings
  • Rule: ActivityStreamsMapasEquivalentb3sb3sifpdbprdf-labelfacetshttp://dbpedia.org/resource/inference/rules/dbpedia#http://dbpedia.org/resource/inference/rules/opencyc#http://dbpedia.org/resource/inference/rules/umbel#http://dbpedia.org/resource/inference/rules/yago#http://dbpedia.org/schema/property_rules#http://www.ontologyportal.org/inference/rules/SUMO#http://www.ontologyportal.org/inference/rules/WordNet#http://www.w3.org/2002/07/owl#ldpoplwebrel-me-authskos-transurn:det:rdf:labelurn:kidehen:glossary:inference:rulesurn:owl:inference:rules:testsvirtpivot-rulesvirtrdf-eturtle-containersvirtrdf-hashtagvirtrdf-ifpvirtrdf-labelvirtrdf-meta-entity-classvirtrdf-urlNone
    
  • Inverse Functional Properties: Disabled (fastest) Apply to subjects only Apply to objects only Apply to both subjects and objects
  • "Same As": Disabled (fastest) Apply to subjects only Apply to objects only Apply to both subjects and objects (recommended) Apply to subjects, objects and predicates (not recommended on big datasets) Apply to predicates only (special use cases only)

About: Intelligent Query Optimization     Goto   Sponge   NotDistinct   Permalink

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Type: Product Featurehttp://www.openlinksw.com/ontology/features#Feature New Facet based on Instances of this Class

Virtuoso has a cost based optimizer that uses statistics for deciding join order, join type, index usage, and other execution plan matters. Virtuoso supports hash and loop joins, reusing hash join hash tables if the underlying data does not change, and merge intersection of indices for multiple index lookup. The optimizer automatically recognizes loop invariants and calculates these as early as possible. A special explain function allows viewing the execution plan. Optimizer directives exist for direct control of join order, join type, and index usage.