[redland-dev] University0_12

[bigfreexyz at sina.com]

 Hi,
 
In my test, when the query condition incresing, performance of SPARQL query is dropped down dramatically:
Is there any kown issue in SPARQL query?
 
I tried to load the attached rdf file into RDF Storage (about 6000 triples), and perform below SPARQL query on it, and get the executing time of them.
I use in-memory storage with hash for the test.
 
Testing results:
Query1：Less than 1ms    
SELECT ?Y where {?Y <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.lehigh.edu/~zhp2/2004/0401/univ-bench.owl#Department>}
 
Query2: About 30ms
SELECT ?Y where {?Y <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.lehigh.edu/~zhp2/2004/0401/univ-bench.owl#Department>.
?Y <http://www.lehigh.edu/~zhp2/2004/0401/univ-bench.owl#subOrganizationOf> <http://www.University0.edu>}    
 
Query3: About 500ms!
SELECT ?X, ?Y where {?X <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.lehigh.edu/~zhp2/2004/0401/univ-bench.owl#FullProfessor> .
?Y <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.lehigh.edu/~zhp2/2004/0401/univ-bench.owl#Department>.
?X <http://www.lehigh.edu/~zhp2/2004/0401/univ-bench.owl#worksFor> ?Y .
?Y <http://www.lehigh.edu/~zhp2/2004/0401/univ-bench.owl#subOrganizationOf> <http://www.University0.edu>}
 
 
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