You can drop the « (wdt:P31/(wdt:P279*)) wd:Q18616576; » part, it’s
useless.
« ?prop wikibase:propertyType ?type. » is enough :
https://w.wiki/4Kmp
and it’s fast.
What seem to be really expensive is the label part, just adding the label
(alone) at least triples or quadruples the query time, this takes us from
less than a seconds to 3/4 seconds
https://w.wiki/4Kms
https://w.wiki/4Kmv
Le ven. 29 oct. 2021 à 16:12, Thad Guidry <thadguidry(a)gmail.com> a écrit :
Hi David and team,
In Yi Liu's tool, Wikidata Property Explorer, I noticed that the query
performance could be better ideally. Currently the query takes about 9
seconds and I'm asking if there might be anything to help reduce that
considerably? Refactoring query for optimization, backend changes,
anything you can think of Davd?
SELECT DISTINCT ?prop ?label ?desc ?type (GROUP_CONCAT(DISTINCT ?alias;
SEPARATOR = " | ") AS ?aliases) WHERE {
?prop (wdt:P31/(wdt:P279*)) wd:Q18616576;
wikibase:propertyType ?type.
OPTIONAL {
?prop rdfs:label ?label.
FILTER((LANG(?label)) = "en")
}
OPTIONAL {
?prop schema:description ?desc.
FILTER((LANG(?desc)) = "en")
}
OPTIONAL {
?prop skos:altLabel ?alias.
FILTER((LANG(?alias)) = "en")
}
}
GROUP BY ?prop ?label ?desc ?type
Thad
https://www.linkedin.com/in/thadguidry/
https://calendly.com/thadguidry/
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