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Relevant Search: With Applications for Solr and Elasticsearch

For more in depth reading about search, ranking and generally everything you could ever want to know about how lucene, elasticsearch or solr work under the hood I highly suggest this book. Easily one of the most interesting technical books I have read in a long time. If you are tasked with solving search relevance problems even if not in Solr or Elasticsearch it should be your first reference. Amazon Affiliate Link
https://bitbucket.org/bo_hmb/bo_hmb
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314<li class="toctree-l2"><a class="reference internal" href="../libraries/config.html">Config Class</a></li>
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350<li class="toctree-l2"><a class="reference internal" href="../database/helpers.html">Query Helper Functions</a></li>
351<li class="toctree-l2"><a class="reference internal" href="../database/query_builder.html">Query Builder Class</a></li>
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429<p>Before performing an update you should take your site offline by
430replacing the index.php file with a static one.</p>
431<div class="section" id="step-1-update-your-codeigniter-files">
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433<p>Replace all files and directories in your <em>system/</em> directory.</p>
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440<div class="section" id="step-2-update-your-ci-sessions-database-table">
441<h2>Step 2: Update your “ci_sessions” database table<a class="headerlink" href="#step-2-update-your-ci-sessions-database-table" title="Permalink to this headline"></a></h2>
442<p>If you’re using the <a class="reference internal" href="../libraries/sessions.html"><span class="doc">Session Library</span></a> with the
443‘database’ driver, you may have to <code class="docutils literal"><span class="pre">ALTER</span></code> your sessions table for your
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450<p>This will only affect you if you’ve changed your <code class="docutils literal"><span class="pre">session.hash_function</span></code>
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453<p>It is recommended that you do this anyway, just to avoid potential issues
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455<p>Just execute the one of the following SQL queries, depending on your
456database:</p>
457<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="c1">// MySQL:</span>
458<span class="nx">ALTER</span> <span class="nx">TABLE</span> <span class="nx">ci_sessions</span> <span class="nx">CHANGE</span> <span class="nx">id</span> <span class="nx">id</span> <span class="nx">varchar</span><span class="p">(</span><span class="mi">128</span><span class="p">)</span> <span class="k">NOT</span> <span class="k">NULL</span><span class="p">;</span>
459
460<span class="c1">// PostgreSQL</span>
461<span class="nx">ALTER</span> <span class="nx">TABLE</span> <span class="nx">ci_sessions</span> <span class="nx">ALTER</span> <span class="nx">COLUMN</span> <span class="nx">id</span> <span class="nx">SET</span> <span class="nx">DATA</span> <span class="nx">TYPE</span> <span class="nx">varchar</span><span class="p">(</span><span class="mi">128</span><span class="p">);</span>
462</pre></div>
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