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class="dw__toc"> <h3 class="toggle">Table of Contents</h3> <div> <ul class="toc"> <li class="level1"><div class="li"><a href="#fulltext_index">Fulltext Index</a></div> <ul class="toc"> <li class="level2"><div class="li"><a href="#structure">Structure</a></div> <ul class="toc"> <li class="level3"><div class="li"><a href="#pageidx">page.idx</a></div></li> <li class="level3"><div class="li"><a href="#w_word_length_idx">w<word length>.idx</a></div></li> <li class="level3"><div class="li"><a href="#i_word_length_idx">i<word length>.idx</a></div></li> <li class="level3"><div class="li"><a href="#pagewordidx">pageword.idx</a></div></li> </ul> </li> <li class="level2"><div class="li"><a href="#indexing">Indexing</a></div></li> <li class="level2"><div class="li"><a href="#searching">Searching</a></div></li> </ul></li> </ul> </div> </div>  <h1 class="sectionedit1" id="fulltext_index">Fulltext Index</h1> <div class="level1"> <p> For quickly <a href="/search" class="wikilink1" title="search" data-wiki-id="search">searching</a> the wiki, a fulltext index is used. </p> <p> <img src="/lib/images/smileys/fixme.svg" class="icon smiley" alt="FIXME" /> documentation in progress - might be wrong. </p> <p> The index system is designed with the following three premises in mind: </p> <ol> <li class="level1"><div class="li"> PHP execution time is limited (usually 30 seconds, on some hosts less)</div> </li> <li class="level1"><div class="li"> Memory is limited (we recommend 32MB but it's less for many hosters)</div> </li> <li class="level1"><div class="li"> Disk Space is cheap</div> </li> </ol> </div> <div class="secedit editbutton_section editbutton_1"><form class="button btn_secedit" method="post" action="/devel:fulltextindex"><div class="no"><input type="hidden" name="do" value="edit" /><input type="hidden" name="rev" value="1543434466" /><input type="hidden" name="summary" value="[Fulltext Index] " /><input type="hidden" name="target" value="section" /><input type="hidden" name="hid" value="fulltext_index" /><input type="hidden" name="codeblockOffset" value="0" /><input type="hidden" name="range" value="1-398" /><button type="submit" title="Fulltext Index">Edit</button></div></form></div> <h2 class="sectionedit2" id="structure">Structure</h2> <div class="level2"> <p> All parts of the fulltext index are stored in <code>data/index</code>: </p> <ul> <li class="level1"><div class="li"> <code>page.idx</code> – a list of all known pages</div> </li> <li class="level1"><div class="li"> <code>w<em><word length></em>.idx</code> – a list of all known words with a byte length of <em><word length></em></div> </li> <li class="level1"><div class="li"> <code>i<em><word length></em>.idx</code> – word → page assignments</div> </li> <li class="level1"><div class="li"> <code>pageword.idx</code> – page → word assignments</div> </li> </ul> </div> <div class="secedit editbutton_section editbutton_2"><form class="button btn_secedit" method="post" action="/devel:fulltextindex"><div class="no"><input type="hidden" name="do" value="edit" /><input type="hidden" name="rev" value="1543434466" /><input type="hidden" name="summary" value="[Structure] " /><input type="hidden" name="target" value="section" /><input type="hidden" name="hid" value="structure" /><input type="hidden" name="codeblockOffset" value="0" /><input type="hidden" name="range" value="399-739" /><button type="submit" title="Structure">Edit</button></div></form></div> <h3 class="sectionedit3" id="pageidx">page.idx</h3> <div class="level3"> <p> This file contains all ever indexed pages, one page per line. The line number (starting from 0) is considered the <strong>PID</strong>. </p> <p> Note, that pages are not removed from this index when they are deleted. The existence check is done on search time. </p> </div> <div class="secedit editbutton_section editbutton_3"><form class="button btn_secedit" method="post" action="/devel:fulltextindex"><div class="no"><input type="hidden" name="do" value="edit" /><input type="hidden" name="rev" value="1543434466" /><input type="hidden" name="summary" value="[page.idx] " /><input type="hidden" name="target" value="section" /><input type="hidden" name="hid" value="pageidx" /><input type="hidden" name="codeblockOffset" value="0" /><input type="hidden" name="range" value="740-1000" /><button type="submit" title="page.idx">Edit</button></div></form></div> <h3 class="sectionedit4" id="w_word_length_idx">w<word length>.idx</h3> <div class="level3"> <p> These files contain a list of all ever indexed words with a byte length of <em><word length></em>. The line number (starting from 0) is considered the <strong>WID</strong> </p> </div> <div class="secedit editbutton_section editbutton_4"><form class="button btn_secedit" method="post" action="/devel:fulltextindex"><div class="no"><input type="hidden" name="do" value="edit" /><input type="hidden" name="rev" value="1543434466" /><input type="hidden" name="summary" value="[w<word length>.idx] " /><input type="hidden" name="target" value="section" /><input type="hidden" name="hid" value="w_word_length_idx" /><input type="hidden" name="codeblockOffset" value="0" /><input type="hidden" name="range" value="1001-1185" /><button type="submit" title="w<word length>.idx">Edit</button></div></form></div> <h3 class="sectionedit5" id="i_word_length_idx">i<word length>.idx</h3> <div class="level3"> <p> These files contain the real index by mapping words to the pages they occur on. The file also contains the frequency of the word on the given page, which is used for search ranking. </p> <p> The line numbers correspond to the ones in <code>w<word length>.idx</code>, so the w and i indexes should always have the same number of lines. </p> <p> Each line contains <code><em>PID*<frequency></em></code> pairs separated by colons. </p> <p> Imagine line 0 of <code>i5.idx</code> containing this entry: </p> <pre class="code">0*2:55*5:23*1</pre> <p> this would mean that <em>word 0</em> (→ line 0 in <code>w5.idx</code>) occurs 2 times on page 0 (→ line 0 in <code>pages.idx</code>), 5 times on page 55 (→ line 55 in <code>pages.idx</code>) and one time on page 23 (→ line 23 in <code>pages.idx</code>). </p> </div> <div class="secedit editbutton_section editbutton_5"><form class="button btn_secedit" method="post" action="/devel:fulltextindex"><div class="no"><input type="hidden" name="do" value="edit" /><input type="hidden" name="rev" value="1543434466" /><input type="hidden" name="summary" value="[i<word length>.idx] " /><input type="hidden" name="target" value="section" /><input type="hidden" name="hid" value="i_word_length_idx" /><input type="hidden" name="codeblockOffset" value="0" /><input type="hidden" name="range" value="1186-1893" /><button type="submit" title="i<word length>.idx">Edit</button></div></form></div> <h3 class="sectionedit6" id="pagewordidx">pageword.idx</h3> <div class="level3"> <p> This index is used to remove words from the index that are no longer on a changed or deleted page. </p> <p> The line number (starting from 0) is the <strong>PID</strong> from the <code>page.idx</code>. Each line contains <code><em><wordlength>*WID</em></code> pairs separated by colons. </p> <p> As only one line of that index is read and written during an index update that index is quite efficient. </p> </div> <div class="secedit editbutton_section editbutton_6"><form class="button btn_secedit" method="post" action="/devel:fulltextindex"><div class="no"><input type="hidden" name="do" value="edit" /><input type="hidden" name="rev" value="1543434466" /><input type="hidden" name="summary" value="[pageword.idx] " /><input type="hidden" name="target" value="section" /><input type="hidden" name="hid" value="pagewordidx" /><input type="hidden" name="codeblockOffset" value="0" /><input type="hidden" name="range" value="1894-2267" /><button type="submit" title="pageword.idx">Edit</button></div></form></div> <h2 class="sectionedit7" id="indexing">Indexing</h2> <div class="level2"> <p> <a href="https://codesearch.dokuwiki.org/search?project=dokuwiki&defs=&path=inc%20indexer.php" class="interwiki plugin_xref" title="search definitions for inc/indexer.php">inc/indexer.php</a> contains all fulltext index building related functions. </p> <p> <img src="/lib/images/smileys/fixme.svg" class="icon smiley" alt="FIXME" /> describe the process </p> </div> <div class="secedit editbutton_section editbutton_7"><form class="button btn_secedit" method="post" action="/devel:fulltextindex"><div class="no"><input type="hidden" name="do" value="edit" /><input type="hidden" name="rev" value="1543434466" /><input type="hidden" name="summary" value="[Indexing] " /><input type="hidden" name="target" value="section" /><input type="hidden" name="hid" value="indexing" /><input type="hidden" name="codeblockOffset" value="0" /><input type="hidden" name="range" value="2268-2400" /><button type="submit" title="Indexing">Edit</button></div></form></div> <h2 class="sectionedit8" id="searching">Searching</h2> <div class="level2"> <p> <a href="https://codesearch.dokuwiki.org/search?project=dokuwiki&defs=&path=inc%20fulltext.php" class="interwiki plugin_xref" title="view definition for inc/fulltext.php">inc/fulltext.php</a> contains all fulltext index searching related functions. </p> <p> <img src="/lib/images/smileys/fixme.svg" class="icon smiley" alt="FIXME" /> describe the process </p> </div> <div class="secedit editbutton_section editbutton_8"><form class="button btn_secedit" method="post" action="/devel:fulltextindex"><div class="no"><input type="hidden" name="do" value="edit" /><input type="hidden" name="rev" value="1543434466" /><input type="hidden" name="summary" value="[Searching] " /><input type="hidden" name="target" value="section" /><input type="hidden" name="hid" value="searching" /><input type="hidden" name="codeblockOffset" value="0" /><input type="hidden" name="range" value="2401-" /><button type="submit" title="Searching">Edit</button></div></form></div>  </div> <div class="docInfo"><bdi>devel/fulltextindex.txt</bdi> · Last modified: <time datetime="2018-11-28T20:47:46+0100">2018-11-28 20:47</time> by <bdi>torpedo</bdi></div> <hr class="a11y" /> </div></main>  <nav id="dokuwiki__pagetools" aria-labelledby="dokuwiki__pagetools__heading"> <h3 class="a11y" id="dokuwiki__pagetools__heading">Page Tools</h3> <div class="tools"> <ul> <li class="edit"><a href="/devel:fulltextindex?do=edit" title="Edit this page [e]" rel="nofollow" accesskey="e"><span>Edit this page</span><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24"><path d="M20.71 7.04c.39-.39.39-1.04 0-1.41l-2.34-2.34c-.37-.39-1.02-.39-1.41 0l-1.84 1.83 3.75 3.75M3 17.25V21h3.75L17.81 9.93l-3.75-3.75L3 17.25z"/></svg></a></li><li class="revs"><a href="/devel:fulltextindex?do=revisions" title="Old revisions [o]" rel="nofollow" accesskey="o"><span>Old revisions</span><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24"><path d="M11 7v5.11l4.71 2.79.79-1.28-4-2.37V7m0-5C8.97 2 5.91 3.92 4.27 6.77L2 4.5V11h6.5L5.75 8.25C6.96 5.73 9.5 4 12.5 4a7.5 7.5 0 0 1 7.5 7.5 7.5 7.5 0 0 1-7.5 7.5c-3.27 0-6.03-2.09-7.06-5h-2.1c1.1 4.03 4.77 7 9.16 7 5.24 0 9.5-4.25 9.5-9.5A9.5 9.5 0 0 0 12.5 2z"/></svg></a></li><li class="backlink"><a href="/devel:fulltextindex?do=backlink" title="Backlinks" rel="nofollow"><span>Backlinks</span><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24"><path d="M10.59 13.41c.41.39.41 1.03 0 1.42-.39.39-1.03.39-1.42 0a5.003 5.003 0 0 1 0-7.07l3.54-3.54a5.003 5.003 0 0 1 7.07 0 5.003 5.003 0 0 1 0 7.07l-1.49 1.49c.01-.82-.12-1.64-.4-2.42l.47-.48a2.982 2.982 0 0 0 0-4.24 2.982 2.982 0 0 0-4.24 0l-3.53 3.53a2.982 2.982 0 0 0 0 4.24m2.82-4.24c.39-.39 1.03-.39 1.42 0a5.003 5.003 0 0 1 0 7.07l-3.54 3.54a5.003 5.003 0 0 1-7.07 0 5.003 5.003 0 0 1 0-7.07l1.49-1.49c-.01.82.12 1.64.4 2.43l-.47.47a2.982 2.982 0 0 0 0 4.24 2.982 2.982 0 0 0 4.24 0l3.53-3.53a2.982 2.982 0 0 0 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type="text/css"> @media screen { body { padding-top: 30px; } #global__header { position: absolute; top: 0; left: 0; text-align: left; vertical-align: middle; line-height: 1.5; background-color: #333; box-shadow: 0 0 8px rgba(0,0,0,0.5); width: 100%; margin: 0; padding: 5px 20px; -moz-box-sizing: border-box; -webkit-box-sizing: border-box; box-sizing: border-box; white-space: nowrap; overflow: hidden; } #global__header h2 { position: absolute; left: -99999em; top: 0; overflow: hidden; display: inline; } #global__header ul, #global__header li { margin: 0; padding: 0; list-style: none; display: inline; line-height: 1.5; } #global__header a { color: #bbb; text-decoration: none; margin-right: 20px; font-size: 14px; font-weight: normal; } #global__header a:hover, #global__header a:active, #global__header a:focus { color: #fff; text-decoration: underline; } #global__header form { float: right; margin: 0 0 0 20px; } #global__header input { background-color: #333; background-image: none; border: 1px solid #bbb; color: #fff; box-shadow: none; border-radius: 2px; margin: 0; line-height: normal; padding: 1px 0 1px 0; height: auto; } #global__header input.button { border: none; color: #bbb; } #global__header input.button:hover, #global__header input.button:active, #global__header input.button:focus { color: #fff; text-decoration: underline; } } /* /@media */ @media only screen and (min-width: 601px) { /* changes specific for www.dokuwiki.org */ #dokuwiki__header { padding-top: 3em; } #dokuwiki__usertools { top: 3em; } /* changes specific for bugs.dokuwiki.org */ div#container div#showtask { top: 40px; } } /* /@media */ @media only screen and (max-width: 600px) { body { padding-top: 0; } #global__header { position: static; white-space: normal; overflow: auto; } #global__header form { float: none; display: block; margin: 0 0 .4em; } } /* /@media */ @media print { #global__header { display: none; } } /* /@media */ </style> <div id="global__header"> <h2>Global DokuWiki Links</h2> <form method="get" action="https://search.dokuwiki.org/" target="_top"> <input type="text" name="q" title="Search all DokuWiki sites at once" class="input" /> <input type="submit" title="Search all DokuWiki sites at once" value="Search" class="button" /> </form> <ul> <li><a href="https://download.dokuwiki.org" title="Download the latest release" target="_top">Download</a></li> <li><a href="https://www.dokuwiki.org" title="Read the DokuWiki documentation" target="_top">Wiki</a></li> <li><a href="https://forum.dokuwiki.org" title="Ask questions in the DokuWiki forum" target="_top">Forum</a></li> <li><a href="https://irc.dokuwiki.org" title="Check IRC chat logs or join the chat" target="_top">IRC</a></li> <li><a href="https://github.com/splitbrain/dokuwiki/issues" title="Report and track bugs" target="_top">Bugs</a></li> <li><a href="https://translate.dokuwiki.org/" title="Help translating the DokuWiki interface" target="_top">Translate</a></li> <li><a href="https://github.com/splitbrain/dokuwiki" title="Access the most recent git commits" target="_top">Git</a></li> <li><a href="https://xref.dokuwiki.org/reference/dokuwiki/" title="Cross-Reference of the DokuWiki source code" target="_top">XRef</a></li> <li><a href="https://codesearch.dokuwiki.org/" title="Search through the sources of DokuWiki, plugins and templates" target="_top">Code Search</a></li> </ul> </div>  </div></footer> </div></div> <div class="no"><img src="/lib/exe/taskrunner.php?id=devel%3Afulltextindex&1742843503" width="2" height="1" alt="" /></div> <div id="screen__mode" class="no"></div></body> </html>