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| <h1 class="title">TDB 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> |
| <ul> |
| <li> |
| <ul> |
| <li><a href="#setting-from-the-command-line">Setting from the command line</a></li> |
| <li><a href="#setting-with-java-system-properties">Setting with Java System properties</a></li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| <li><a href="#query-of-the-union-of-named-graphs">Query of the union of named graphs</a></li> |
| <li><a href="#logging-query-execution">Logging Query Execution</a></li> |
| <li><a href="#dataset-caching">Dataset Caching</a></li> |
| <li><a href="#file-access-mode">File Access Mode</a></li> |
| <li><a href="#tdb-configuration-symbols">TDB Configuration Symbols</a></li> |
| <li><a href="#advanced-store-configuration">Advanced Store Configuration</a></li> |
| </ul> |
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| </aside> |
| <article class="flex-column me-lg-4"> |
| <p>There are a number of configuration options that affect the |
| operation of TDB.</p> |
| <h2 id="setting-options">Setting Options</h2> |
| <p>Options can be set globally, through out the JVM, or on a per query |
| execution basis. TDB 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 TDB and accessed 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> TDB.getContext().set(symbol, value) ; |
| </code></pre> |
| <p>Per query execution:</p> |
| <pre><code>try(QueryExecution qExec = QueryExecution.dataset(dataset) |
| .query(query).set(ARQ.symLogExec,true).build() ) { |
| .... |
| } |
| </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> |
| <h4 id="setting-from-the-command-line">Setting from the command line</h4> |
| <p>Options can also set from the |
| <a href="commands.html#setting-options-from-the-command-line" title="TDB/Commands">command line</a> |
| with “<code>--set</code>.</p> |
| <h4 id="setting-with-java-system-properties">Setting with Java System properties</h4> |
| <p>(TDB 0.8.5 and later)</p> |
| <p>Options can be set when invoking the JVM using the Java system |
| properties as set by “<code>-D</code>”.</p> |
| <h2 id="query-of-the-union-of-named-graphs">Query of the union of named graphs</h2> |
| <p>See <a href="datasets.html" title="TDB/Datasets">TDB/Datasets</a>.</p> |
| <h2 id="logging-query-execution">Logging Query Execution</h2> |
| <p>If the symbol “<code>tdb:logExec</code>” is set to “true”, and also the logger |
| <code>org.apache.jena.tdb.exec</code> is enabled from level “info”, then each |
| basic graph patterns is logged before execution. This pattern |
| logged is after substitution of variable values and after |
| optimization by the |
| <a href="optimizer.html" title="TDB/Optimizer">BGP optimizer</a>.</p> |
| <h2 id="dataset-caching">Dataset Caching</h2> |
| <p>(TDB 0.8.0 and later)</p> |
| <p>TDB caches datasets based on the location of the backing directory. |
| Within a single JVM, all attempts to create or open a dataset at a |
| particular location go through the same dataset (and same disk |
| caching). Therefore, an application can open the same location |
| several times in different places in the code and still get the |
| same underlying dataset for query and update.</p> |
| <p>Note that closing the dataset closes it everywhere (the opening |
| calls are not being reference counted).</p> |
| <h2 id="file-access-mode">File Access Mode</h2> |
| <p>The context symbol can be set to “mapped” or “direct”. Unset, or |
| the value “default”, ask TDB to use to make the choice based on |
| JVM. Leaving it to the default is <em>strongly</em> encouraged.</p> |
| <h2 id="tdb-configuration-symbols">TDB Configuration Symbols</h2> |
| <p>Configuration Symbols</p> |
| <table> |
| <thead> |
| <tr> |
| <th>Symbol</th> |
| <th>Java Constant</th> |
| <th>Effect</th> |
| <th>Default</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td><code>tdb:logExec</code></td> |
| <td><code>TDB.symLogExec</code></td> |
| <td>Log execution of BGPs. Set to “true” to enable. Must also enable the logger “org.apache.jena.tdb.exec”.</td> |
| <td>unset</td> |
| </tr> |
| <tr> |
| <td><code>tdb:unionDefaultGraph</code></td> |
| <td><code>TDB.symUnionDefaultGraph</code></td> |
| <td>Query patterns on the default graph match against the union of the named graphs.</td> |
| <td>unset</td> |
| </tr> |
| <tr> |
| <td><code>tdb:fileMode</code></td> |
| <td><code>SystemTDB.fileMode</code></td> |
| <td>Force use of memory mapped files (<code>"mapped"</code>) or direct file caching (<code>"direct"</code>). See discussion of TDB on 32 or 64 bit hardware, especially limitations of memory mapped files on 32 bit Java.</td> |
| <td>Set by the system based on 32 or 64 bit java.</td> |
| </tr> |
| </tbody> |
| </table> |
| <h2 id="advanced-store-configuration">Advanced Store Configuration</h2> |
| <p>Various internal caching sizes can be set to different values to the |
| defaults. See the <a href="store-parameters.html">full description</a>.</p> |
| |
| </article> |
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| <nav id="TableOfContents"> |
| <ul> |
| <li><a href="#setting-options">Setting Options</a> |
| <ul> |
| <li> |
| <ul> |
| <li><a href="#setting-from-the-command-line">Setting from the command line</a></li> |
| <li><a href="#setting-with-java-system-properties">Setting with Java System properties</a></li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| <li><a href="#query-of-the-union-of-named-graphs">Query of the union of named graphs</a></li> |
| <li><a href="#logging-query-execution">Logging Query Execution</a></li> |
| <li><a href="#dataset-caching">Dataset Caching</a></li> |
| <li><a href="#file-access-mode">File Access Mode</a></li> |
| <li><a href="#tdb-configuration-symbols">TDB Configuration Symbols</a></li> |
| <li><a href="#advanced-store-configuration">Advanced Store Configuration</a></li> |
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