获取使用SPARQL dbpedia的人员列表

问题描述

我正在使用来检索人员列表。我正在上执行 sparql查询，以获得结果。我已固定查询中的偏移量和极限值，并在每次尝试10000次后获得记录 。但是当我尝试以 580000偏移量值执行时，发生了 504网关超时错误。

I am using live-dbpedia to retrieve the list of persons. I am executing a sparql query on live-dbpedia endpoints to get the result.I have fixed the offset and limit value in the query and getting the records after each 10000 attempt. But when I was trying to execute at 580000 offset value, 504 Gateway Time-out error happens.

不起作用 SPARQL查询：

Not Working SPARQL Query:

SELECT DISTINCT ?dbpedia_link str(?name) as ?label str(?label1) as ?label1 ?freebase_link WHERE {
        ?dbpedia_link rdfs:label ?label1 . 
        ?dbpedia_link foaf:name ?name .
        {
         { ?dbpedia_link rdf:type dbpedia-owl:Person }                            
        }                        
        OPTIONAL {?dbpedia_link owl:sameAs ?freebase_link .
        FILTER regex(?freebase_link, "^http://rdf.freebase.com") .}
        FILTER (lang(?label1) = 'en'). 
        ?dbpedia_link dcterms:subject ?sub 
        }Limit 1000
        OFFSET 580000

工作中 SPARQL查询：

Working SPARQL Query :

SELECT DISTINCT ?dbpedia_link str(?name) as ?label str(?label1) as ?label1 ?freebase_link WHERE {
            ?dbpedia_link rdfs:label ?label1 . 
            ?dbpedia_link foaf:name ?name .
            {
             { ?dbpedia_link rdf:type dbpedia-owl:Person }                            
            }                        
            OPTIONAL {?dbpedia_link owl:sameAs ?freebase_link .
            FILTER regex(?freebase_link, "^http://rdf.freebase.com") .}
            FILTER (lang(?label1) = 'en'). 
            ?dbpedia_link dcterms:subject ?sub 
            }Limit 1000
            OFFSET 50000

如何解决此问题。

推荐答案

在请求之间添加延迟。实时端点中有一个速率限制，这是您超出该限制时得到的错误。还有一个短暂的超时时间，以使该服务更可用。

Put a delay between your requests. There is a rate limit in the live endpoint and this is the error you get when you exceed it. There is also a short timeout to make the service more available.

（免责声明：我负责该服务）

(Disclaimer: I am responsible for the service)

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