Timeout - Discovery

9 Dec 2022

Hi,
I am getting frequent timeouts trying to use the SPARQL endpoint GUI at
https://query.wikidata.org/ . 
I'll admit, I have some complex queries, bu I really feel like this is something that
the system should be able to handle or at least allow me to request a longer timeout wait.

For example, this query:

            SELECT ?item ?item2
            WHERE
            {

            ?item wdt:P625 ?location .
            ?item <http://www.w3.org/2002/07/owl#sameAs> ?item2 .

            }
            LIMIT 10

or this query:

SELECT DISTINCT ?item ?itemname  ?location 
        WHERE {
                ?item wdt:P625 ?location ;
                    wdt:P31 ?type ;
                    rdfs:label ?itemname.
                ?type wdt:P279 ?supertype .

                FILTER(
                LANG(?itemname) = "en" &&
                ?supertype not in (wd:Q5, wd:Q4991371, wd:Q7283, wd:Q36180, wd:Q7094076,
wd:Q905511, wd:Q1063801, 
                wd:Q1062856, wd:Q35127, wd:Q68, wd:Q42848, wd:Q2858615, wd:Q241317 ,
wd:Q1662611, wd:Q7397, wd:Q151885, 
                wd:Q1301371, wd:Q1068715, wd:Q7366 , wd:Q18602249, wd:Q16521, wd:Q746549,
wd:Q13485782, wd:Q36963) 
                ) 

        }
LIMIT 200000

When I use python SPARQLwrapper things improve somewhat, but still timeout on some of my
queries. 
I tried the first query above on an old wikidata dump we have from 2021 that we loaded on
Jena TDB and it managed to complete it (0 results, but I had to run it to figure that
out...). 
Seems strange to get such poor performance.
Cheers
Tomer