Failed opening required 'DB.php'

久しぶりにPHP・・・

<!--?php
require_once("DB.php");
　・
　・
　・
?-->

PEAR::DBを使おうとしたらいきなりエラー発生。

Warning: require_once(DB.php) [function.require-once]: failed to open stream: No such file or directory in /var/www/html/dbRead.php on line 2
Fatal error: require_once() [function.require]: Failed opening required 'DB.php' (include_path='.:/usr/share/pear:/usr/share/php') in /var/www/html/dbRead.php on line 2

php-pear-dbをインストールしてないからか・・・

[root@localhost ~]# yum -y install php-pear-db
[root@localhost ~]# /etc/rc.d/init.d/httpd restart