Performance issue

[NicoLaval]

Hi,

We run a lightweight sample (5 000 triples only - available here) in Qlever and we have performance issues when we request it (locally and on a deployed instance).

Running:

PREFIX cdi: <http://ddialliance.org/Specification/DDI-CDI/1.0/RDF/>
SELECT ?rv WHERE {
  ?rv a cdi:RepresentedVariable
}

No problem, results appear in a few milliseconds.

Running:

PREFIX cdi: <http://ddialliance.org/Specification/DDI-CDI/1.0/RDF/>
PREFIX owl: <http://www.w3.org/2002/07/owl#>
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
SELECT ?rv_cat ?rv_code ?census_code WHERE {
  ?rv a cdi:RepresentedVariable ;
      cdi:Concept-name ?on .
  ?on cdi:ObjectName-name "65b0bda47b8b593c96d6be5dc5cac151"^^xsd:string .
  ?rv cdi:RepresentedVariable_takesSubstantiveValuesFrom_SubstantiveValueDomain ?svd .
  ?svd cdi:SubstantiveValueDomain_takesValuesFrom_EnumerationDomain ?cl .
  ?cl cdi:CodeList_has_Code ?c .
  ?c cdi:Code_denotes_Category ?ct ;
     cdi:Code_uses_Notation ?n .
  ?ct cdi:Concept-displayLabel ?is .
  ?is cdi:InternationalString-languageSpecificString ?ls .
  ?ls cdi:LanguageString-content ?rv_cat .
  ?n cdi:Notation-content ?ts .
  ?ts cdi:TypedString-content ?rv_code .
  ?ct cdi:Concept-externalDefinition ?r .
  ?r cdi:Reference-nonDdiReference ?ndi .
  ?ndi cdi:NonDdiIdentifier-value ?census_cs_c .
  BIND (STRAFTER(?census_cs_c,"_") AS ?census_code)
}

Response came after 10 secondes.

I uploaded the same sample in GraphDB and execution took 0.1 second.

[hannahbast]

Are you using the latest version of QLever?

[NicoLaval]

I was 2 weeks late.
By updating, I have now 900 ms as response time.