maintenance/rebuildtextindex.inc

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