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| <h1 class="title">SDB Database Layouts</h1> |
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| <blockquote> |
| <p>The Apache Jena SDB module has been retired and is no longer supported.<br/> |
| The last release of Jena with this module was Apache Jena 3.17.0.<br/></p> |
| </blockquote> |
| <hr> |
| <p><a href="index.html" title="SDB">SDB</a> does not have a single database layout. This |
| page is an informal overview of the two main types (“layout2/hash” |
| and “layout2/index”).</p> |
| <p>In SDB one store is one RDF dataset is one SQL database.</p> |
| <p>Databases of type layout2 have a triples table for the default |
| graph, a quads table for the named graphs. In the triples and quads |
| tables, the columns are integers referencing a nodes table.</p> |
| <p>In the hash form, the integers are 8-byte hashes of the node.</p> |
| <p>In the index form, the integers are 4-byte sequence ids into the |
| node table.</p> |
| <p><strong>Triples</strong></p> |
| <pre><code>+-----------+ |
| | S | P | O | |
| +-----------+ |
| </code></pre> |
| <p>Primary key: SPO <br /> |
| Indexes: PO, OS</p> |
| <p><strong>Quads</strong></p> |
| <pre><code>+---------------+ |
| | G | S | P | O | |
| +---------------+ |
| </code></pre> |
| <p>Primary key: GSPO <br /> |
| Indexes: GPO, GOS, SPO, OS, PO.</p> |
| <p><strong>Nodes</strong></p> |
| <p>In the index-based layout, the table is:</p> |
| <pre><code>+------------------------------------------------+ |
| | Id | Hash | lex | lang | datatype | value type | |
| +------------------------------------------------+ |
| </code></pre> |
| <p>Primary key: Id <br /> |
| Index: Hash</p> |
| <p>Hash:</p> |
| <pre><code>+-------------------------------------------+ |
| | Hash | lex | lang | datatype | value type | |
| +-------------------------------------------+ |
| </code></pre> |
| <p>Primary key: Hash</p> |
| <p>All character fields are unicode, supporting any character set, |
| including mixed language use.</p> |
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