maintenance/storage/orphanStats.php

   1 <?php
   2 /**
   3  * Show some statistics on the blob_orphans table, created with trackBlobs.php.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup Maintenance ExternalStorage
  22  */
  23
  24 require_once( __DIR__ . '/../Maintenance.php' );
  25
  26 /**
  27  * Maintenance script that shows some statistics on the blob_orphans table,
  28  * created with trackBlobs.php.
  29  *
  30  * @ingroup Maintenance ExternalStorage
  31  */
  32 class OrphanStats extends Maintenance {
  33         public function __construct() {
  34                 parent::__construct();
  35                 $this->mDescription = "how some statistics on the blob_orphans table, created with trackBlobs.php";
  36         }
  37
  38         protected function &getDB( $cluster, $groups = array(), $wiki = false ) {
  39                 $lb = wfGetLBFactory()->getExternalLB( $cluster );
  40                 return $lb->getConnection( DB_SLAVE );
  41         }
  42
  43         public function execute() {
  44                 $dbr = wfGetDB( DB_SLAVE );
  45                 if ( !$dbr->tableExists( 'blob_orphans' ) ) {
  46                         $this->error( "blob_orphans doesn't seem to exist, need to run trackBlobs.php first", true );
  47                 }
  48                 $res = $dbr->select( 'blob_orphans', '*', false, __METHOD__ );
  49
  50                 $num = 0;
  51                 $totalSize = 0;
  52                 $hashes = array();
  53                 $maxSize = 0;
  54
  55                 foreach ( $res as $boRow ) {
  56                         $extDB = $this->getDB( $boRow->bo_cluster );
  57                         $blobRow = $extDB->selectRow( 'blobs', '*', array( 'blob_id' => $boRow->bo_blob_id ), __METHOD__ );
  58
  59                         $num++;
  60                         $size = strlen( $blobRow->blob_text );
  61                         $totalSize += $size;
  62                         $hashes[ sha1( $blobRow->blob_text ) ] = true;
  63                         $maxSize = max( $size, $maxSize );
  64                 }
  65                 unset( $res );
  66
  67                 $this->output( "Number of orphans: $num\n" );
  68                 if ( $num > 0 ) {
  69                         $this->output( "Average size: " . round( $totalSize / $num, 0 ) . " bytes\n" .
  70                         "Max size: $maxSize\n" .
  71                         "Number of unique texts: " . count( $hashes ) . "\n" );
  72                 }
  73         }
  74 }
  75
  76 $maintClass = "OrphanStats";
  77 require_once RUN_MAINTENANCE_IF_MAIN;