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| <h1 class="title">SDB Query performance</h1> |
| |
| <p>This page compares the effect of SDB with RDB, Jena’s usual |
| database layout. RDB was designed for supporting the fine-grained |
| API calls as well as having some support for basic graph patterns. |
| Therefore, the RDB design goals were not those of SDB.</p> |
| <p>RDB uses a denormalised database layout in order that all |
| statement-level operations do not require additional joins. The |
| <a href="database_layouts.html" title="SDB/Database Layouts">SDB layout</a> is |
| normalised so that the triple table is narrower and uses integers |
| for RDF nodes, then does do joins to get the node representation. |
| These optimizers for longer patterns, not API operations.</p> |
| <p>These figures were taken July 2007.</p> |
| <p>As with any performance figures, these should be taken merely as a |
| guide. The shape of the data, the hardware details, choice of |
| database, and its configuration (particularly amount of memory |
| used), as well as the queries themselves all greatly contribute to |
| the execution costs.</p> |
| <h2 id="contents">Contents</h2> |
| <ul> |
| <li><a href="#setup">Setup</a></li> |
| <li><a href="#lubm-query-1">LUBM Query 1</a></li> |
| <li><a href="#lubm-query-2">LUBM Query 2</a></li> |
| <li><a href="#summary">Summary</a></li> |
| </ul> |
| <h2 id="setup">Setup</h2> |
| <p><a href="loading_performance.html#the-databases-and-hardware" title="SDB/Loading performance">Database and hardware setup</a> |
| was the same as for the |
| <a href="loading_performance.html" title="SDB/Loading performance">load performance</a> |
| tests.</p> |
| <p>Data was taken generated with the LUBM test generator (with N = |
| 15), then the inference expanded on loading to give about 19.5 |
| million triples. This data is larger than the database could |
| completely cache.</p> |
| <p>The queries are taken the LUBM suite and rewritten in SPARQL.</p> |
| <h2 id="lubm-query-1">LUBM Query 1</h2> |
| <pre><code> PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> |
| PREFIX ub: <http://www.lehigh.edu/~zhp2/2004/0401/univ-bench.owl#> |
| SELECT * WHERE |
| { |
| ?x rdf:type ub:GraduateStudent . |
| ?x ub:takesCourse <http://www.Department0.University0.edu/GraduateCourse0> . |
| } |
| </code></pre> |
| <p>Jena: 24.16s <br /> |
| SDB/index: 0.014s<br /> |
| SDB/hash: 0.04s</p> |
| <h2 id="lubm-query-2">LUBM Query 2</h2> |
| <pre><code> PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> |
| PREFIX ub: <http://www.lehigh.edu/~zhp2/2004/0401/univ-bench.owl#> |
| SELECT * WHERE |
| { |
| ?x rdf:type ub:GraduateStudent . |
| ?y rdf:type ub:University . |
| ?z rdf:type ub:Department . |
| ?x ub:memberOf ?z . |
| ?z ub:subOrganizationOf ?y . |
| ?x ub:undergraduateDegreeFrom ?y . |
| } |
| </code></pre> |
| <p>This query searches for a particular pattern in the data without |
| specific starting point.</p> |
| <p>Jena: 232.1s (153s with an addition index on OP) <br /> |
| SDB/index: 12.7s <br /> |
| SDB/hash: 3.7s</p> |
| <p><strong>Notes:</strong> Removing the <code>rdf:type</code> statements actually slows the query down.</p> |
| <h2 id="summary">Summary</h2> |
| <p>In SPARQL queries, there is often a sufficiently complex graph |
| pattern that the SDb design tradeoff provides significant |
| advantages in query performance.</p> |
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