<?php global $wpdb;

$count = $wpdb->get_var(
	"SELECT COUNT( option_id ) 
	FROM {$wpdb->options} 
	WHERE option_name LIKE 'um_cache_userdata_%'"
); ?>

<p><?php _e( 'Run this task from time to time to keep your DB clean.', 'ultimate-member' ) ?></p>
<p>
	<a href="<?php echo add_query_arg( 'um_adm_action', 'user_cache' ); ?>" class="button">
		<?php printf( __( 'Clear cache of %s users', 'ultimate-member' ), $count ) ?>
	</a>
</p>