{"id":2141,"date":"2005-08-03T23:17:35","date_gmt":"2005-08-03T23:17:35","guid":{"rendered":"http:\/\/www.leobard.net\/blog\/?p=2141"},"modified":"2017-11-04T15:48:25","modified_gmt":"2017-11-04T15:48:25","slug":"sparql-fast-as-hell","status":"publish","type":"post","link":"https:\/\/www.leobard.net\/blog\/2005\/08\/03\/sparql-fast-as-hell\/","title":{"rendered":"sparql fast as hell"},"content":{"rendered":"

In the last two months we shifted the gnowsis search services to SPARQL. Our problem was, that the common ARQ implementation is slow and does not work in a named graph scenario.<\/p>\n

A fine twist in history brought Richard Cyganiak to work at HP Labs for a while and he hacked sparql2sql <\/a>there, a mapping of sparql to the jena database scheme with support for named graphs.<\/p>\n

I asked him if I can use it in gnowsis and he was quite happy to have this as a test-case. Result is, that Richard added a special framework for fulltext search and I hacked some stuff regarding MySQL’s fine FULLTEXT index functions (if you don’t know it: its similiar to lucene, can do relevance and query expansion and so on)<\/p>\n

outcome: an hour ago I transformed the SQL index to the new fulltext format and got hit in the face with the new answer times:<\/p>\n

SPARQL of this kind works practically instantly (10-20msec):
\nPREFIX rdf: <http:\/\/www.w3.org\/1999\/02\/22-rdf-syntax-ns#>
\nPREFIX rdfs: <http:\/\/www.w3.org\/2000\/01\/rdf-schema#>
\nSELECT ?x ?label WHERE
\n{ GRAPH ?source {
\n?x rdfs:label ?label.
\nFILTER REGEX(?label, “test”, “i”)}}<\/cite><\/p>\n

But the real astonishing thing is that SPARQL of this kind is also fast as hell (10-500ms):
\nPREFIX rdf: <http:\/\/www.w3.org\/1999\/02\/22-rdf-syntax-ns#>
\nPREFIX rdfs: <http:\/\/www.w3.org\/2000\/01\/rdf-schema#>
\nSELECT ?x ?p ?label WHERE
\n{ GRAPH ?source {
\n?x ?p ?label.
\nFILTER REGEX(?label, “test”, “i”)}}<\/cite><\/p>\n

In simple words: this is a fulltext scan over all properties of all statements. don’t get bothered by the warmup time, the thing will need about 10-20 sec warmup, but then its great.<\/p>\n

triplecount:
\n371994<\/p>\n

for the freaks we will probably pack a little executable jar that packs all into a nice demo. for the real freaks:
\nhttp:\/\/gnowsis.opendfki.de\/repos\/gnowsis\/trunk\/sparql2sql\/<\/a><\/p>\n

demo app <\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

In the last two months we shifted the gnowsis search services to SPARQL. Our problem was, that the common ARQ implementation is slow and does not work in a named graph scenario. A fine twist in history brought Richard Cyganiak to work at HP Labs for a while and he hacked sparql2sql there, a mapping … <\/p>\n

Continue reading “sparql fast as hell”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_bluesky_dont_syndicate":"","_bluesky_syndication_accounts":"","_bluesky_syndication_text":"","activitypub_content_warning":"","activitypub_content_visibility":"","activitypub_max_image_attachments":3,"activitypub_interaction_policy_quote":"anyone","activitypub_status":"","footnotes":""},"categories":[5],"tags":[],"class_list":["post-2141","post","type-post","status-publish","format-standard","hentry","category-semweb"],"yoast_head":"\nsparql fast as hell - Leobard's blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.leobard.net\/blog\/2005\/08\/03\/sparql-fast-as-hell\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"sparql fast as hell - Leobard's blog\" \/>\n<meta property=\"og:description\" content=\"In the last two months we shifted the gnowsis search services to SPARQL. 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