如何更改DBpedia SPARQL查询的执行时间上限? (Virtuoso 42000错误) [英] How to change upper execution time limit for a DBpedia SPARQL query? (Virtuoso 42000 error)
问题描述
我正在通过Python使用SPARQL查询DBpedia。我面临执行时间上限的问题。这是错误:
I am querying DBpedia using SPARQL through Python. I am facing issues with the upper execution time limit. This is the error :
代码:
sparql = SPARQLWrapper("http://dbpedia.org/sparql")
newquery = "DEFINE input:inference "skos-trans" PREFIX dcterms: <http://purl.org/dc/terms/>
select distinct ?cat1 ?cat2 ?cat3 ?cat4 where {
<http://dbpedia.org/resource/Pulp_Fiction> dcterms:subject ?cat1 .
?cat1 skos:broaderTransitive ?cat2.
?cat2 skos:broaderTransitive ?cat3.
?cat3 skos:broaderTransitive ?cat4.
} "
sparql.setQuery( newquery)
sparql.setReturnFormat(JSON)
results = sparql.query().convert()
响应:< br>
Virtuoso 42000错误估计的执行时间5286(秒)超过了3000(秒)的限制
如何解决这个问题?
推荐答案
您不能使用公共DBPedia端点,因为该端点众所周知,它也被大量使用,因此来限制允许人们运行的查询的复杂程度。
You can't using the public DBPedia endpoint, because the endpoint is very well known it is also heavily used so they have to limit how complex a query they allow people to run.
如果您需要运行遇到此类超时问题的查询,请考虑使用可用的数据库转储,并在Virtuoso或您选择的三元存储的本地副本中运行它们。
If you need to run queries that run into issues like this timeout consider using one of the available database dumps and running them in a local copy of Virtuoso or a triple store of your choice.
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