mysql random_bytes

`RANDOM_BYTES()` 是 MySQL 中的一个函数，用于生成指定长度的随机字节序列。它可以用于生成安全的随机数值和密码。

以下是一个使用 `RANDOM_BYTES()` 函数生成 10 字节长度随机字节序列的示例代码：

SELECT RANDOM_BYTES(10);

结果类似于：

+------------------+
| RANDOM_BYTES(10) |
+------------------+
| 0x4F1D6C3CC0EAC5 |
+------------------+

需要注意的是，`RANDOM_BYTES()` 函数只在 MySQL 5.7.17 版本及以上版本中可用。

相关问题

mysql_global_status_bytes_sent

`mysql_global_status_bytes_sent` 是 MySQL 数据库的一个全局状态变量，用于记录自启动以来已发送的字节数。它包括所有 MySQL 服务器线程处理的网络通信中发送的字节数，如客户端连接和复制线程等。可以通过执行以下 SQL 语句获取该变量的值：

SHOW GLOBAL STATUS LIKE 'Bytes_sent';

如果需要获取特定时间范围内的字节数，可以结合使用 `mysql_global_status_bytes_sent` 和 `mysql_global_status_uptime` 变量，计算出平均每秒发送的字节数。例如，以下 SQL 语句将返回自服务器启动以来每秒平均发送的字节数：

SELECT (SUM(Bytes_sent)/SUM(Uptime)) AS AvgBytesPerSec
FROM information_schema.global_status
WHERE variable_name = 'Bytes_sent' OR variable_name = 'Uptime';

You need to specify one of the following as an environment variable: - MYSQL_ROOT_PASSWORD - MYSQL_ALLOW_EMPTY_PASSWORD - MYSQL_RANDOM_ROOT_PASSWORD

When setting up a MySQL container, you need to specify one of the following environment variables to configure the root password:

1. `MYSQL_ROOT_PASSWORD`: This variable sets the password for the root user explicitly.

2. `MYSQL_ALLOW_EMPTY_PASSWORD`: Setting this variable to any value allows the root user to have an empty password. Note that this is not recommended for production environments.

3. `MYSQL_RANDOM_ROOT_PASSWORD`: If you set this variable to any value, it will generate a random password for the root user.

Choose one of these variables based on your requirements and provide the appropriate value when running the MySQL container.

Here's an example of how you can set the `MYSQL_ROOT_PASSWORD` environment variable:

docker run --name mysql-container -e MYSQL_ROOT_PASSWORD=your_password -d mysql:tag

Replace `your_password` with your desired root password and `tag` with the appropriate MySQL version or tag you want to use.

Remember to use a strong and secure password for production environments.