orphanStats.php

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<?php
require_once( __DIR__ . '/../Maintenance.php' );

class OrphanStats extends Maintenance {
        public function __construct() {
                parent::__construct();
                $this->mDescription = "how some statistics on the blob_orphans table, created with trackBlobs.php";
        }

        protected function &getDB( $cluster, $groups = array(), $wiki = false ) {
                $lb = wfGetLBFactory()->getExternalLB( $cluster );
                return $lb->getConnection( DB_SLAVE );
        }

        public function execute() {
                $dbr = wfGetDB( DB_SLAVE );
                if ( !$dbr->tableExists( 'blob_orphans' ) ) {
                        $this->error( "blob_orphans doesn't seem to exist, need to run trackBlobs.php first", true );
                }
                $res = $dbr->select( 'blob_orphans', '*', false, __METHOD__ );

                $num = 0;
                $totalSize = 0;
                $hashes = array();
                $maxSize = 0;

                foreach ( $res as $boRow ) {
                        $extDB = $this->getDB( $boRow->bo_cluster );
                        $blobRow = $extDB->selectRow( 'blobs', '*', array( 'blob_id' => $boRow->bo_blob_id ), __METHOD__ );

                        $num++;
                        $size = strlen( $blobRow->blob_text );
                        $totalSize += $size;
                        $hashes[ sha1( $blobRow->blob_text ) ] = true;
                        $maxSize = max( $size, $maxSize );
                }
                unset( $res );

                $this->output( "Number of orphans: $num\n" );
                if ( $num > 0 ) {
                        $this->output( "Average size: " . round( $totalSize / $num, 0 ) . " bytes\n" .
                        "Max size: $maxSize\n" .
                        "Number of unique texts: " . count( $hashes ) . "\n" );
                }
        }
}

$maintClass = "OrphanStats";
require_once( RUN_MAINTENANCE_IF_MAIN );