config.php.example

<?php
// Settings

// Syntax highlight queries?
$settings['sqlColor'] = true;

$reviewhost = array(
// Replace hostname and database in this setting
    'dsn'           => 'mysql:host=hostname:3306;dbname=database',
    'user'          => 'user',
    'password'      => 'password',
// See http://www.percona.com/doc/percona-toolkit/2.0/pt-query-digest.html#cmdoption-pt-query-digest--review
    'review_table'  => 'review',
// This table is optional. You don't need it, but you lose detailed stats
// Set to a blank string to disable
// See http://www.percona.com/doc/percona-toolkit/2.0/pt-query-digest.html#cmdoption-pt-query-digest--review-history
    'history_table' => 'review_history',
);

$explainhosts = array(
    'label1'   => array(
        'dsn'       => 'mysql:host=hostname1:3306',
        'user'      => 'user',
        'password'  => 'password',
    // By default we scan the host to see what databases we can run a
    // explain on. To disable this behavour, set an array here
        'databases' => array(
            'database1',
            'database2',
            'database4'
        ),
    ),
    'label2'   => array(
        'dsn'       => 'mysql:host=hostname2:3306',
        'user'      => 'user',
        'password'  => 'password',
    // You can also just set the field and keep it empty. We will scan for valid databases
        'databases' => array(),
    ),
    // ad nauseum...
);