I go to my index page and the error message shown as below...

**********************************************************

This page cannot be displayed due to an internal error.

If you are the administrator of this site, please visit the XOOPS Troubleshooting Page for assistance.

Error [Xoops]: Unable to connect to database in file class/database/databasefactory.php line 34

**********************************************************

I cannot find any help in XOOPS Troubleshooting Page.
What can I do now??
Can I save everything in my site??

Thanks for your help~~

this could be caused by a variety of reasons:
database server error down
exceeded your bandwidth or MySQL limitation
mis-configuring your db parameters
...

make double-check to find the exact reason.

Thank you for your help.

I have try to check my database server. There is no error. And my bandwidth limitation have not exceeded.

Furthermore, I have not done any modification after my last login.

Is it cause by installation of different modules?

max_questions not exceeded?
mainfile.php file not corrupted?

other reasons? no idea at this moment.

perhaps you need do a simple db connect test by:

$isDBok = mysql_connect("yourHOST", "yourDBUSERname", "yourDBPASS");