我在托管计划（与多个托管网站共享的托管计划）上经历了非凡的CPU负载，我发现许多过程来自一个电子商务网站。我关闭了网站，CPU负载下降了（又回到了正常区域）。

我试图通过有问题的网站的日志文件来找出引发此搜索的原因。我发现日志文件每2-3分钟创建一次，并且所有文件都包含类似的代码行，例如下一个块（出于安全原因，我更改了db用户名和真实文件夹名）：

[20-Mar-2020 06:36:30 America/Chicago] PHP Warning:  mysqli_connect(): (28000/1045): access denied for user 'dbuser'@'localhost' (using password: YES) in /home4/myroot/public_html/website_folder/includes/classes/db/mysql/query_factory.php on line 64
[20-Mar-2020 06:36:30 America/Chicago] Request URI: /,IP address: 31.13.103.24
#1  mysqli_connect() called at [/home4/myroot/public_html/website_folder/includes/classes/db/mysql/query_factory.php:64]
#2  queryFactory->connect() called at [/home4/myroot/public_html/website_folder/includes/init_includes/init_database.php:23]
#3  require(/home4/myroot/public_html/website_folder/includes/init_includes/init_database.php) called at [/home4/myroot/public_html/website_folder/includes/autoload_func.php:48]
#4  require(/home4/myroot/public_html/website_folder/includes/autoload_func.php) called at [/home4/myroot/public_html/website_folder/includes/application_top.php:170]
#5  require(/home4/myroot/public_html/website_folder/includes/application_top.php) called at [/home4/myroot/public_html/website_folder/index.php:26] 

和以这一行开头的类似代码块：

[24-Mar-2020 08:57:10 America/Chicago] PHP Warning:  mysqli_connect(): (28000/1045): access denied for user 'root'@'localhost' (using password: NO) in /home4/myroot/public_html/website_folder/includes/classes/db/mysql/query_factory.php on line 64

一个日志文件包含许多这样的代码块-一个在另一个下面。这看起来是否像是外部尝试以破坏网站（即sql注入尝试）？

我看到大量带有这些行的日志文件与CPU高负载相关。有人有解释吗？

谢谢！