Eccolo il configuration.php: così tolgo tutti i dubbi:
<?php
if(!defined('RG_EMULATION')) { define( 'RG_EMULATION', 0 ); }
$mosConfig_MetaAuthor = '1';
$mosConfig_MetaDesc = 'descrizione';
$mosConfig_MetaKeys = 'parole chiave';
$mosConfig_MetaTitle = '1';
$mosConfig_absolute_path = 'D:/Inetpub/webs/miositoxxx/public';
$mosConfig_admin_expired = '1';
$mosConfig_allowUserRegistration = '0';
$mosConfig_back_button = '1';
$mosConfig_cachepath = 'D:/Inetpub/webs/miositoxxx/public/cache';
$mosConfig_cachetime = '900';
$mosConfig_caching = '0';
$mosConfig_db = 'Sqlbbbbb_4';
$mosConfig_dbprefix = 'jos_';
$mosConfig_debug = '0';
$mosConfig_dirperms = '';
$mosConfig_editor = 'tinymce';
$mosConfig_enable_log_items = '0';
$mosConfig_enable_log_searches = '0';
$mosConfig_enable_stats = '0';
$mosConfig_error_message = 'Sito temporaneamente irraggiungibile.
Notificare il problema ad un amministratore';
$mosConfig_error_reporting = '-1';
$mosConfig_favicon = 'favicon.ico';
$mosConfig_fileperms = '';
$mosConfig_fromname = 'nome';
$mosConfig_frontend_login = '1';
$mosConfig_frontend_userparams = '1';
$mosConfig_gzip = '0';
$mosConfig_helpurl = '
http://help.joomla.org';
$mosConfig_hideAuthor = '1';
$mosConfig_hideCreateDate = '1';
$mosConfig_hideEmail = '0';
$mosConfig_hideModifyDate = '1';
$mosConfig_hidePdf = '1';
$mosConfig_hidePrint = '0';
$mosConfig_hits = '1';
$mosConfig_host = 'xx.xxx.xxx.xxx';
$mosConfig_icons = '1';
$mosConfig_item_navigation = '1';
$mosConfig_itemid_compat = '0';
$mosConfig_lang = 'italian';
$mosConfig_lifetime = '900';
$mosConfig_link_titles = '1';
$mosConfig_list_limit = '30';
$mosConfig_live_site = '
http://www.miosito.xxx/public';$mosConfig_locale = 'it_IT';
$mosConfig_mailer = 'mail';
$mosConfig_mailfrom = 'info@miosito.xxx';
$mosConfig_multilingual_support = '0';
$mosConfig_multipage_toc = '1';
$mosConfig_offline = '0';
$mosConfig_offline_message = 'Sito offline per manutenzione.
Riprovare tra poco.';
$mosConfig_offset = '-1';
$mosConfig_offset_user = '0';
$mosConfig_pagetitles = '1';
$mosConfig_password = 'password';
$mosConfig_readmore = '1';
$mosConfig_secret = 'UDkJYrayT4BzP5PD';
$mosConfig_sef = '0';
$mosConfig_sendmail = '/usr/sbin/sendmail';
$mosConfig_session_life_admin = '1800';
$mosConfig_session_type = '0';
$mosConfig_shownoauth = '0';
$mosConfig_sitename = 'nome sito';
$mosConfig_smtpauth = '0';
$mosConfig_smtphost = 'localhost';
$mosConfig_smtppass = '';
$mosConfig_smtpuser = '';
$mosConfig_uniquemail = '1';
$mosConfig_user = 'Sqlbbbbb';
$mosConfig_useractivation = '0';
$mosConfig_vote = '0';
setlocale (LC_TIME, $mosConfig_locale);
?>
Se metto i dati vecchi del db user, db name, db host e password db del Sqlaaaaa funziona; se metto gli stessi dati nuovi del Sqlbbbbb non funziona.
