maintenance/rebuildtextindex.inc

   1 <?php
   2 require_once 'counter.php';
   3 /**
   4  * Rebuild the fulltext search indexes. This may take a while
   5  * depending on the database size and server configuration.
   6  *
   7  * Rebuilding is faster if you drop the index and recreate it,
   8  * but that will prevent searches from working while it runs.
   9  *
  10  * @todo document
  11  * @package MediaWiki
  12  * @subpackage Maintenance
  13  */
  14
  15 /** */
  16 define( "RTI_CHUNK_SIZE", 500 );
  17
  18 function dropTextIndex( &$database )
  19 {
  20         $searchindex = $database->tableName( 'searchindex' );
  21         if ( $database->indexExists( "searchindex", "si_title" ) ) {
  22                 echo "Dropping index...\n";
  23                 $sql = "ALTER TABLE $searchindex DROP INDEX si_title, DROP INDEX si_text";
  24                 $database->query($sql, "dropTextIndex" );
  25         }
  26 }
  27
  28 function createTextIndex( &$database )
  29 {
  30         $searchindex = $database->tableName( 'searchindex' );
  31         echo "\nRebuild the index...\n";
  32         $sql = "ALTER TABLE $searchindex ADD FULLTEXT si_title (si_title), " .
  33           "ADD FULLTEXT si_text (si_text)";
  34         $database->query($sql, "createTextIndex" );
  35 }
  36
  37 function rebuildTextIndex( &$database )
  38 {
  39         list ($page, $revision, $text, $searchindex) = $database->tableNamesN( 'page', 'revision', 'text', 'searchindex' );
  40
  41         $sql = "SELECT MAX(page_id) AS count FROM $page";
  42         $res = $database->query($sql, "rebuildTextIndex" );
  43         $s = $database->fetchObject($res);
  44         $count = $s->count;
  45         echo "Rebuilding index fields for {$count} pages...\n";
  46         $n = 0;
  47
  48         while ( $n < $count ) {
  49                 print_c( $n - 1, $n);
  50                 $end = $n + RTI_CHUNK_SIZE - 1;
  51                 $sql = "SELECT page_id, page_namespace, page_title, old_flags, old_text
  52                           FROM $page, $revision, $text
  53                          WHERE page_id BETWEEN $n AND $end
  54                            AND page_latest=rev_id
  55                            AND rev_text_id=old_id";
  56                 $res = $database->query($sql, "rebuildTextIndex" );
  57
  58                 while( $s = $database->fetchObject($res) ) {
  59                         $revtext = Revision::getRevisionText( $s );
  60                         $u = new SearchUpdate( $s->page_id, $s->page_title, $revtext );
  61                         $u->doUpdate();
  62                 }
  63                 $database->freeResult( $res );
  64                 $n += RTI_CHUNK_SIZE;
  65         }
  66 }
  67
  68 ?>