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---++What?
Virtuoso SPARQL pragma for negating query optimizer.
---++Why?
There are situations where engine based query optimization isn't suitable for the SPARQL query at hand. In situations like this, you can apply a query pragma that signals to Virtuoso the need to negate its in-built query optimizer.
---++How?
---+++Example with pragma sql:select-option
The following example demonstrates usage of the <code> sql:select-option </code> pragma.
<verbatim>
DEFINE sql:select-option "order"
PREFIX ub: <http://www.lehigh.edu/~zhp2/2004/0401/univ-bench.owl#>
SELECT *
WHERE
{
?s ?p <http://www.Department0.University0.edu/GraduateCourse0>
}
LIMIT 10
</verbatim>
* [[http://bit.ly/VU5H3F][View the SPARQL Query Definition via SPARQL Protocol URL]]
* [[http://bit.ly/YaQ5D6][View the SPARQL Query Results via SPARQL Protocol URL]]
---++Sponger Usage Examples
* [[http://docs.openlinksw.com/virtuoso/virtuososponger.html#virtuosospongerusageprocessorex][SPARQL Processor Usage Example]]
* [[http://docs.openlinksw.com/virtuoso/virtuososponger.html#virtuosospongerusageproxyex2][RDF Proxy Service Example]]
* [[http://virtuoso.openlinksw.com/dataspace/dav/wiki/Main/VirtDeployingLinkedDataGuide_BrowsingNorthwindRdfView#AncMozToc2][Browsing & Exploring RDF View Example Using ODE]]
* [[http://virtuoso.openlinksw.com/dataspace/dav/wiki/Main/VirtDeployingLinkedDataGuide_BrowsingNorthwindRdfView#AncMozToc3][Browsing & Exploring RDF View Example Using iSPARQL]]
* [[http://docs.openlinksw.com/virtuoso/rdfinsertmethods.html#rdfinsertmethodplapissimpleexample][Basic Sponger Cartridge Example]]
* [[http://docs.openlinksw.com/virtuoso/virtuososponger.html#virtuosospongerusagebriefex][HTTP Example for Extracting Metadata using CURL]]
* [[http://docs.openlinksw.com/virtuoso/virtuososponger.html#virtuosospongercartridgetypesmetarestexamples][RESTFul Interaction Examples]]
* [[http://docs.openlinksw.com/virtuoso/sect5_virtuosospongercreatecustcartrrgstflickr.html][Flickr Cartridge Example]]
* [[http://docs.openlinksw.com/virtuoso/virtuososponger.html#virtuosospongercreatecustcartrexmp][MusicBrainz Metadatabase Example]]
* [[VirtTipsAndTricksGuideAddTriplesNamedGraph][SPARQL Tutorial -- Magic of SPARUL and Sponger]]
---++Related
* [[VirtSpongerLinkedDataHooksIntoSPARQL][Sponger's Linked Data Middleware Hooks into SPARQL]]
* [[VirtSponger][Virtuoso Sponger]]
* [[http://virtuoso.openlinksw.com/Whitepapers/html/VirtSpongerWhitePaper.html][Technical White Paper]]
* [[VirtSpongerCartridgeSupportedDataSources][Supported Virtuoso Sponger Cartridges]]
* [[SPARQLSponger][SPARQL Sponger]]
* [[VirtInteractSpongerMiddlewareRESTPatterns][Interacting with Sponger Middleware via RESTful Patterns]]
* [[VirtSpongerCartridgeSupportedDataSourcesMetaRESTExamples][Interacting with Sponger Meta Cartridge via RESTful Patterns]]
* [[VirtSpongerCartridgeRDFExtractor][Sponger Cartridge RDF Extractor]]
* [[RDFMappers][ Extending SPARQL IRI Dereferencing with RDF Mappers]]
* [[VirtSpongerCartridgeProgrammersGuide][Programmer Guide for Virtuoso Linked Data Middleware ("Sponger")]]
* [[VirtProgrammerGuideRDFCartridge][Create RDF Custom Cartridge Tutorial]]
* [[VirtSpongerCartridgeSupportedDataSources][OpenLink-supplied Virtuoso Sponger Cartridges]]
* [[VirtAuthServerUI][Virtuoso Authentication Server]]
* [[VirtOAuthSPARQL][Virtuoso SPARQL OAuth Tutorial]]
* [[VirtSpongerACL][Virtuoso Sponger Access Control List (ACL) Setup]]
* [[VirtSPARQLSecurityWebID][WebID Protocol & SPARQL Endpoint ACLs Tutorial]]
* [[http://docs.openlinksw.com/virtuoso/virtuososponger.html][Virtuoso Documentation]]
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![[RDF Data]](/fct/images/sw-rdf-blue.png)
![[cxml]](/fct/images/cxml_doc.png)
![[csv]](/fct/images/csv_doc.png)
![[text]](/fct/images/ntriples_doc.png)
![[turtle]](/fct/images/n3turtle_doc.png)
![[ld+json]](/fct/images/jsonld_doc.png)
![[rdf+json]](/fct/images/json_doc.png)
![[rdf+xml]](/fct/images/xml_doc.png)
![[atom+xml]](/fct/images/atom_doc.png)
![[html]](/fct/images/html_doc.png)