maintenance/storage/orphanStats.php

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