Shortcode select another dbbase

Your code looks correct to me, so I suspect there is some kind of issue connecting to the second database.
Try the following which will log the last error:

$wpdb->show_errors(); 
if($wpdb->last_error !== '') :
    $wpdb->print_error()
endif;

If you are using multisite, then you will also need to add:

define( 'DIEONDBERROR', true );

Have a look here for more info: https://codex.wordpress.org/Class_Reference/wpdb#Show_and_Hide_SQL_Errors

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