Google Analytics tracking code on just one page?

Instead of page slug use page id like is_page(12) where page id 12

Edit
Your code should work I afraid your page slug is not same, so it will be safe to use page ID instead of slug

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)