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;