嚇人的"Unable to connect to database server"畫面

只有在5.0的版本才會看到這個畫面，很嚇人，因為不曉得這是不是正常網頁的一部份。
一個水滴大頭加上下面的訊息

Unable to connect to database server

If you still have to install Drupal, proceed to the installation page.

If you have already finished installed Drupal, this either means that the username and password information in your settings.php file is incorrect or that we can't connect to the MySQL database server. This could mean your hosting provider's database server is down.

The MySQL error was: Too many connections.

Currently, the username is XXX and the database server is localhost.

* Are you sure you have the correct username and password?
* Are you sure that you have typed the correct hostname?
* Are you sure that the database server is running?

For more help, see the Installation and upgrading handbook. If you are unsure what these terms mean you should probably contact your hosting provider.

夭壽喔，這是怎樣？伺服器連不上？不曉得的人還以為這個網站被駭了吧！
TKY在同一個伺服器上面裝4.7版，有時候很慢沒錯，但不會有這種畫面出現。裝了一個5.0版，還在測試中，不定幾天出現一次。到底是伺服器的問題還是TKY的問題？

畫面出現不打緊，還列出資料庫使用者名稱？這不會增加風險嗎？

TKY