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| <h1 class="title">SDB Configuration</h1> |
| |
| |
| <main class="d-flex flex-xl-row flex-column"> |
| |
| <aside class="text-muted align-self-start mb-3 p-0 d-xl-none d-block"> |
| <h2 class="h6 sticky-top m-0 p-2 bg-body-tertiary">On this page</h2> |
| <nav id="TableOfContents"> |
| <ul> |
| <li><a href="#setting-options">Setting Options</a></li> |
| <li><a href="#current-options">Current Options</a> |
| <ul> |
| <li><a href="#queries-over-all-named-graphs">Queries over all Named Graphs</a></li> |
| <li><a href="#streaming-over-jdbc">Streaming over JDBC</a></li> |
| <li><a href="#annotated-sql">Annotated SQL</a></li> |
| </ul> |
| </li> |
| </ul> |
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| </aside> |
| <article class="flex-column me-lg-4"> |
| <hr> |
| <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>This page describes the configuration options available. These are |
| options for query processing, not for the database layout and |
| storage, which is controlled by |
| <a href="store_description.html" title="SDB/Store Description">store descriptions</a>.</p> |
| <h2 id="setting-options">Setting Options</h2> |
| <p>Options can be set globally, throughout the JVM, or on a per query |
| execution basis. SDB uses the same mechanism as |
| <a href="http://jena.sf.net/ARQ" title="http://jena.sf.net/ARQ">ARQ</a>.</p> |
| <p>There is a global context, which is give to each query |
| execution as it is created. Modifications to the global context |
| after the query execution is created are not seen by the query |
| execution. Modifications to the context of a single query execution |
| do not affect any other query execution nor the global context.</p> |
| <p>A context is a set of symbol/value pairs. Symbols are used created |
| internal to ARQ and SDB and access via Java constants. Values are |
| any Java object, together with the values <code>true</code> and <code>false</code>, which |
| are short for the constants of class <code>java.lang.Boolean</code>.</p> |
| <p>Setting globally:</p> |
| <pre><code> SDB.getContext().set(symbol, value) ; |
| </code></pre> |
| <p>Per query execution:</p> |
| <pre><code> QueryExecution qExec = QueryExecutionFactory.create(...) ; |
| qExec.getContext.set(symbol, value) ; |
| </code></pre> |
| <p>Setting for a query execution happens before any query compilation |
| or setup happens. Creation of a query execution object does not |
| compile the query, which happens when the appropriate <code>.exec</code> |
| method is called.</p> |
| <h2 id="current-options">Current Options</h2> |
| <table> |
| <thead> |
| <tr> |
| <th>Symbol</th> |
| <th>Effect</th> |
| <th>Default</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td><code>SDB.unionDefaultGraph</code></td> |
| <td>Query patterns on the default graph match against the union of the named graphs.</td> |
| <td>false</td> |
| </tr> |
| <tr> |
| <td><code>SDB.jdbcStream</code></td> |
| <td>Attempt to stream JDBC results.</td> |
| <td>true</td> |
| </tr> |
| <tr> |
| <td><code>SDB.jdbcFetchSize</code></td> |
| <td>Set the JDBC fetch size on the SQL query statements. Must be >= 0.</td> |
| <td>unset</td> |
| </tr> |
| <tr> |
| <td><code>SDB.streamGraphAPI</code></td> |
| <td>Stream Jena APIs (also requires <code>jdbcStream</code> and <code>jdbcFetchSize</code></td> |
| <td>false</td> |
| </tr> |
| <tr> |
| <td><code>SDB.annotateGeneratedSQL</code></td> |
| <td>Put SQL comments in SQL</td> |
| <td>true</td> |
| </tr> |
| </tbody> |
| </table> |
| <h3 id="queries-over-all-named-graphs">Queries over all Named Graphs</h3> |
| <p>All the named graphs can be treated as a single graph in two ways: |
| either set the SDB option above or use the URI that refers to RDF |
| merge of the named graphs (<code>urn:x-arq:UnionGraph</code>).</p> |
| <p>When querying the RDF merge of named graph, the default graph in |
| the store is not included.</p> |
| <p>This feature applies to queries only. It does not affect the |
| storage nor does it change loading.</p> |
| <p>To find out which named graph a triple can be found in, use <code>GRAPH</code> |
| as usual.</p> |
| <p>The following special IRIs exist for use as a graph name in <code>GRAPH</code> |
| only:</p> |
| <ul> |
| <li><code><urn:x-arq:DefaultGraph></code> – the default graph, even when |
| option for named union queries is set.</li> |
| <li><code><urn:x-arq:UnionGraph></code> – the union of all named graphs, even |
| when the option for named union queries is not set.</li> |
| </ul> |
| <h3 id="streaming-over-jdbc">Streaming over JDBC</h3> |
| <p>By default, SDB processes results from SQL statements in a |
| streaming fashion. It is important to close query execution |
| objects, especially if not consuming all the results, because that |
| causes the underlying JDBC result set to be closed. JDBC result |
| sets can be a scarce system resource.</p> |
| <p>If this option is set, but the JDBC connection is not streaming, |
| then this feature is harmless. Setting it false caused SDB to read |
| all results of an SQL statement at once, treating streamed |
| connections as unstreamed.</p> |
| <p>Note that this only streams results end-to-end if the underlying |
| JDBC connection itself is set up to stream. Most do not in the |
| default configuration to reduce transient resource peaks on the |
| server under load.</p> |
| <p>Setting the fetch size enables cursors in some databases but there |
| may be restrictions imposed by the database. See the documentation |
| for your database for details.</p> |
| <p>In addition, operations on the graph API can be made streaming by |
| also setting the Graph API to streaming.</p> |
| <h3 id="annotated-sql">Annotated SQL</h3> |
| <p>SQL generation can include SQL comments to show how SPARQL has been |
| turned into SQL. This option is <code>true</code> by default and always set |
| for the command <code>sdbprint</code>.</p> |
| <pre><code>SDB.getContext().setFalse(SDB.annotateGeneratedSQL) ; |
| </code></pre> |
| |
| </article> |
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| <li><a href="#setting-options">Setting Options</a></li> |
| <li><a href="#current-options">Current Options</a> |
| <ul> |
| <li><a href="#queries-over-all-named-graphs">Queries over all Named Graphs</a></li> |
| <li><a href="#streaming-over-jdbc">Streaming over JDBC</a></li> |
| <li><a href="#annotated-sql">Annotated SQL</a></li> |
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