Script that use OnlineSchemaChange of Facebook

gistfile1.aw

// do online schema change

$alter = "ALTER TABLE ".$tableName." ADD ".$description .";

try {
    $osc = new OnlineSchemaChange($sock, $user, $pwd, $db, null, $alter);

    // Return true on success or false on failure
    return $osc->execute();
} catch (Exception $e) {
    // exception raises only if cleanup fails
    // In that case calls OSC again with FORCE_CLEANUP.

    if (!empty($osc)) {
        $osc->forceCleanup();
    } else {
          echo "Caught OSC constructor exception: ".$e->getMessage(). "\n";
    }

    return false;
}