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<h1><a href="../../index.html">Django 1.6.7 documentation</a></h1>
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<div class="yui-g" id="topics-db-tablespaces">
<div class="section" id="s-tablespaces">
<span id="tablespaces"></span><h1>Tablespaces<a class="headerlink" href="#tablespaces" title="Permalink to this headline">¶</a></h1>
<p>A common paradigm for optimizing performance in database systems is the use of
<a class="reference external" href="http://en.wikipedia.org/wiki/Tablespace">tablespaces</a> to organize disk layout.</p>
<div class="admonition warning">
<p class="first admonition-title">Warning</p>
<p class="last">Django does not create the tablespaces for you. Please refer to your
database engine’s documentation for details on creating and managing
tablespaces.</p>
</div>
<div class="section" id="s-declaring-tablespaces-for-tables">
<span id="declaring-tablespaces-for-tables"></span><h2>Declaring tablespaces for tables<a class="headerlink" href="#declaring-tablespaces-for-tables" title="Permalink to this headline">¶</a></h2>
<p>A tablespace can be specified for the table generated by a model by supplying
the <a class="reference internal" href="../../ref/models/options.html#django.db.models.Options.db_tablespace" title="django.db.models.Options.db_tablespace"><tt class="xref py py-attr docutils literal"><span class="pre">db_tablespace</span></tt></a> option inside the model’s
<tt class="docutils literal"><span class="pre">class</span> <span class="pre">Meta</span></tt>. This option also affects tables automatically created for
<a class="reference internal" href="../../ref/models/fields.html#django.db.models.ManyToManyField" title="django.db.models.ManyToManyField"><tt class="xref py py-class docutils literal"><span class="pre">ManyToManyField</span></tt></a>s in the model.</p>
<p>You can use the <a class="reference internal" href="../../ref/settings.html#std:setting-DEFAULT_TABLESPACE"><tt class="xref std std-setting docutils literal"><span class="pre">DEFAULT_TABLESPACE</span></tt></a> setting to specify a default value
for <a class="reference internal" href="../../ref/models/options.html#django.db.models.Options.db_tablespace" title="django.db.models.Options.db_tablespace"><tt class="xref py py-attr docutils literal"><span class="pre">db_tablespace</span></tt></a>. This is useful for setting
a tablespace for the built-in Django apps and other applications whose code you
cannot control.</p>
</div>
<div class="section" id="s-declaring-tablespaces-for-indexes">
<span id="declaring-tablespaces-for-indexes"></span><h2>Declaring tablespaces for indexes<a class="headerlink" href="#declaring-tablespaces-for-indexes" title="Permalink to this headline">¶</a></h2>
<p>You can pass the <a class="reference internal" href="../../ref/models/fields.html#django.db.models.Field.db_tablespace" title="django.db.models.Field.db_tablespace"><tt class="xref py py-attr docutils literal"><span class="pre">db_tablespace</span></tt></a> option to a
<tt class="docutils literal"><span class="pre">Field</span></tt> constructor to specify an alternate tablespace for the <tt class="docutils literal"><span class="pre">Field</span></tt>’s
column index. If no index would be created for the column, the option is
ignored.</p>
<p>You can use the <a class="reference internal" href="../../ref/settings.html#std:setting-DEFAULT_INDEX_TABLESPACE"><tt class="xref std std-setting docutils literal"><span class="pre">DEFAULT_INDEX_TABLESPACE</span></tt></a> setting to specify
a default value for <a class="reference internal" href="../../ref/models/fields.html#django.db.models.Field.db_tablespace" title="django.db.models.Field.db_tablespace"><tt class="xref py py-attr docutils literal"><span class="pre">db_tablespace</span></tt></a>.</p>
<p>If <a class="reference internal" href="../../ref/models/fields.html#django.db.models.Field.db_tablespace" title="django.db.models.Field.db_tablespace"><tt class="xref py py-attr docutils literal"><span class="pre">db_tablespace</span></tt></a> isn’t specified and you didn’t
set <a class="reference internal" href="../../ref/settings.html#std:setting-DEFAULT_INDEX_TABLESPACE"><tt class="xref std std-setting docutils literal"><span class="pre">DEFAULT_INDEX_TABLESPACE</span></tt></a>, the index is created in the same
tablespace as the tables.</p>
</div>
<div class="section" id="s-an-example">
<span id="an-example"></span><h2>An example<a class="headerlink" href="#an-example" title="Permalink to this headline">¶</a></h2>
<div class="highlight-python"><div class="highlight"><pre><span class="k">class</span> <span class="nc">TablespaceExample</span><span class="p">(</span><span class="n">models</span><span class="o">.</span><span class="n">Model</span><span class="p">):</span>
<span class="n">name</span> <span class="o">=</span> <span class="n">models</span><span class="o">.</span><span class="n">CharField</span><span class="p">(</span><span class="n">max_length</span><span class="o">=</span><span class="mi">30</span><span class="p">,</span> <span class="n">db_index</span><span class="o">=</span><span class="bp">True</span><span class="p">,</span> <span class="n">db_tablespace</span><span class="o">=</span><span class="s">"indexes"</span><span class="p">)</span>
<span class="n">data</span> <span class="o">=</span> <span class="n">models</span><span class="o">.</span><span class="n">CharField</span><span class="p">(</span><span class="n">max_length</span><span class="o">=</span><span class="mi">255</span><span class="p">,</span> <span class="n">db_index</span><span class="o">=</span><span class="bp">True</span><span class="p">)</span>
<span class="n">edges</span> <span class="o">=</span> <span class="n">models</span><span class="o">.</span><span class="n">ManyToManyField</span><span class="p">(</span><span class="n">to</span><span class="o">=</span><span class="s">"self"</span><span class="p">,</span> <span class="n">db_tablespace</span><span class="o">=</span><span class="s">"indexes"</span><span class="p">)</span>
<span class="k">class</span> <span class="nc">Meta</span><span class="p">:</span>
<span class="n">db_tablespace</span> <span class="o">=</span> <span class="s">"tables"</span>
</pre></div>
</div>
<p>In this example, the tables generated by the <tt class="docutils literal"><span class="pre">TablespaceExample</span></tt> model (i.e.
the model table and the many-to-many table) would be stored in the <tt class="docutils literal"><span class="pre">tables</span></tt>
tablespace. The index for the name field and the indexes on the many-to-many
table would be stored in the <tt class="docutils literal"><span class="pre">indexes</span></tt> tablespace. The <tt class="docutils literal"><span class="pre">data</span></tt> field would
also generate an index, but no tablespace for it is specified, so it would be
stored in the model tablespace <tt class="docutils literal"><span class="pre">tables</span></tt> by default.</p>
</div>
<div class="section" id="s-database-support">
<span id="database-support"></span><h2>Database support<a class="headerlink" href="#database-support" title="Permalink to this headline">¶</a></h2>
<p>PostgreSQL and Oracle support tablespaces. SQLite and MySQL don’t.</p>
<p>When you use a backend that lacks support for tablespaces, Django ignores all
tablespace-related options.</p>
</div>
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<ul>
<li><a class="reference internal" href="#">Tablespaces</a><ul>
<li><a class="reference internal" href="#declaring-tablespaces-for-tables">Declaring tablespaces for tables</a></li>
<li><a class="reference internal" href="#declaring-tablespaces-for-indexes">Declaring tablespaces for indexes</a></li>
<li><a class="reference internal" href="#an-example">An example</a></li>
<li><a class="reference internal" href="#database-support">Database support</a></li>
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