<DIV> Hi,
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<DIV>In my test, when the query condition incresing, performance of SPARQL query is dropped down dramatically:</DIV>
<DIV>Is there any kown issue in SPARQL query?</DIV>
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<DIV>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.</DIV>
<DIV>I use in-memory storage with hash for the test.</DIV>
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<DIV>Testing results:<BR>Query1£şLess than 1ms    <BR>SELECT ?Y where {?Y <<A href="wlmailhtml:{D742811C-1436-42B7-9A4D-64445DAD684F}mid://00000000/!x-usc:http://www.w3.org/1999/02/22-rdf-syntax-ns#type">http://www.w3.org/1999/02/22-rdf-syntax-ns#type</A>> <<A href="wlmailhtml:{D742811C-1436-42B7-9A4D-64445DAD684F}mid://00000000/!x-usc:http://www.lehigh.edu/~zhp2/2004/0401/univ-bench.owl#Department">http://www.lehigh.edu/~zhp2/2004/0401/univ-bench.owl#Department</A>>}</DIV>
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<DIV>Query2: About 30ms<BR>SELECT ?Y where {?Y <<A href="wlmailhtml:{D742811C-1436-42B7-9A4D-64445DAD684F}mid://00000000/!x-usc:http://www.w3.org/1999/02/22-rdf-syntax-ns#type">http://www.w3.org/1999/02/22-rdf-syntax-ns#type</A>> <<A href="wlmailhtml:{D742811C-1436-42B7-9A4D-64445DAD684F}mid://00000000/!x-usc:http://www.lehigh.edu/~zhp2/2004/0401/univ-bench.owl#Department">http://www.lehigh.edu/~zhp2/2004/0401/univ-bench.owl#Department</A>>.<BR>?Y <<A href="wlmailhtml:{D742811C-1436-42B7-9A4D-64445DAD684F}mid://00000000/!x-usc:http://www.lehigh.edu/~zhp2/2004/0401/univ-bench.owl#subOrganizationOf">http://www.lehigh.edu/~zhp2/2004/0401/univ-bench.owl#subOrganizationOf</A>> <<A href="wlmailhtml:{D742811C-1436-42B7-9A4D-64445DAD684F}mid://00000000/!x-usc:http://www.university0.edu/">http://www.University0.edu</A>>}    </DIV>
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<DIV>Query3: About 500ms!<BR>SELECT ?X, ?Y where {?X <<A href="wlmailhtml:{D742811C-1436-42B7-9A4D-64445DAD684F}mid://00000000/!x-usc:http://www.w3.org/1999/02/22-rdf-syntax-ns#type">http://www.w3.org/1999/02/22-rdf-syntax-ns#type</A>> <<A href="wlmailhtml:{D742811C-1436-42B7-9A4D-64445DAD684F}mid://00000000/!x-usc:http://www.lehigh.edu/~zhp2/2004/0401/univ-bench.owl#FullProfessor">http://www.lehigh.edu/~zhp2/2004/0401/univ-bench.owl#FullProfessor</A>> .<BR>?Y <<A href="wlmailhtml:{D742811C-1436-42B7-9A4D-64445DAD684F}mid://00000000/!x-usc:http://www.w3.org/1999/02/22-rdf-syntax-ns#type">http://www.w3.org/1999/02/22-rdf-syntax-ns#type</A>> <<A href="wlmailhtml:{D742811C-1436-42B7-9A4D-64445DAD684F}mid://00000000/!x-usc:http://www.lehigh.edu/~zhp2/2004/0401/univ-bench.owl#Department">http://www.lehigh.edu/~zhp2/2004/0401/univ-bench.owl#Department</A>>.<BR>?X <<A href="wlmailhtml:{D742811C-1436-42B7-9A4D-64445DAD684F}mid://00000000/!x-usc:http://www.lehigh.edu/~zhp2/2004/0401/univ-bench.owl#worksFor">http://www.lehigh.edu/~zhp2/2004/0401/univ-bench.owl#worksFor</A>> ?Y .<BR>?Y <<A href="wlmailhtml:{D742811C-1436-42B7-9A4D-64445DAD684F}mid://00000000/!x-usc:http://www.lehigh.edu/~zhp2/2004/0401/univ-bench.owl#subOrganizationOf">http://www.lehigh.edu/~zhp2/2004/0401/univ-bench.owl#subOrganizationOf</A>> <<A href="wlmailhtml:{D742811C-1436-42B7-9A4D-64445DAD684F}mid://00000000/!x-usc:http://www.university0.edu/">http://www.University0.edu</A>>}</DIV>
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