maintenance/storage/orphanStats.php

   1 <?php
   2
   3 /**
   4  * Show some statistics on the blob_orphans table, created with trackBlobs.php
   5  */
   6 require_once( dirname(__FILE__).'/../commandLine.inc' );
   7
   8 $stats = new OrphanStats;
   9 $stats->execute();
  10
  11 class OrphanStats {
  12         function getDB( $cluster ) {
  13                 $lb = wfGetLBFactory()->getExternalLB( $cluster );
  14                 return $lb->getConnection( DB_SLAVE );
  15         }
  16
  17         function execute() {
  18                 $extDBs = array();
  19                 $dbr = wfGetDB( DB_SLAVE );
  20                 $res = $dbr->select( 'blob_orphans', '*', false, __METHOD__ );
  21
  22                 $num = 0;
  23                 $totalSize = 0;
  24                 $hashes = array();
  25                 $maxSize = 0;
  26
  27                 foreach ( $res as $boRow ) {
  28                         $extDB = $this->getDB( $boRow->bo_cluster );
  29                         $blobRow = $extDB->selectRow( 'blobs', '*', array( 'blob_id' => $boRow->bo_blob_id ), __METHOD__ );
  30
  31                         $num++;
  32                         $size = strlen( $blobRow->blob_text );
  33                         $totalSize += $size;
  34                         $hashes[ sha1( $blobRow->blob_text ) ] = true;
  35                         $maxSize = max( $size, $maxSize );
  36                 }
  37                 unset( $res );
  38
  39                 echo "Number of orphans: $num\n";
  40                 if ( $num > 0 ) {
  41                         echo "Average size: " . round( $totalSize / $num, 0 ) . " bytes\n" .
  42                         "Max size: $maxSize\n" .
  43                         "Number of unique texts: " . count( $hashes ) . "\n";
  44                 }
  45         }
  46 }