Database convert character_set_server latin1 to utf8

I am writing about a problem on the character encoding that i have on my site with Magento. In practice, the special characters do not take utf8 and gives me the classic non-coded characters: Ã. These are the codes in my database: character_set_client utf8 character_set_connection utf8 character_set_database utf8 character_set_filesystem binary character_set_results utf8 character_set_server latin1 character_set_system utf8 My question is ... the problem of encoding is caused by character_set_server latin1 string? How do I convert my database character_set_server latin1 to utf8? It can be a very simple Query? Thanks so much