How to Limit Simultaneous Connections on MySQL RDS Database

Answer: A.

Option A is CORRECT because DB parameter groups need to be used to modify RDS DB parameters.

To set a particular parameter, you must create a new DB parameter group and update the specific parameter (max_user_connections in this case).Then you must modify the RDS database instance to use the new DB Parameter group.

Option B is incorrect because you cannot modify the values of the default DB parameter group.

Option C is incorrect because option groups are not used for setting parameters.

Option groups are used to enable and configure additional features provided by some DB engines.

Option D is incorrect because AWS RDS does not allow modification of MySQL system variables directly using the SET statement.

Instead, DB parameter groups must be used.

Reference:

https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_WorkingWithParamGroups.html

The correct answer is A. Create a new DB parameter group. Modify the max_user_connections parameter to 10. Update the RDS MySQL Database to use the new DB parameter group.

Explanation:

Amazon RDS (Relational Database Service) is a managed database service offered by AWS (Amazon Web Services) that allows you to run several relational database engines, including MySQL.

To limit the number of simultaneous connections that a user account can make to 10 on a specific MySQL RDS Database, you need to modify the max_user_connections parameter. This parameter controls the maximum number of simultaneous connections allowed for each user account.

To accomplish this task, you should follow these steps:

Step 1: Create a new DB parameter group The first step is to create a new DB parameter group, which is a collection of database engine parameter values that you can apply to one or more DB instances. You can create a new DB parameter group or copy an existing one and then modify the parameters as needed.

To create a new DB parameter group, follow these steps:

1. Open the Amazon RDS console.
2. In the navigation pane, choose "Parameter groups."
3. Choose "Create parameter group."
4. In the "Create DB Parameter Group" dialog box, enter a name for the new parameter group and a description (optional).
5. Choose the database engine and version that you want to use.
6. Choose "Create."

Step 2: Modify the max_user_connections parameter The next step is to modify the max_user_connections parameter in the new DB parameter group that you just created. You can do this by following these steps:

1. In the Amazon RDS console, choose "Parameter groups."
2. Select the new parameter group that you just created.
3. Choose "Edit parameters."
4. In the "Edit Parameters" dialog box, find the max_user_connections parameter and change its value to 10.
5. Choose "Save changes."

Step 3: Update the RDS MySQL Database to use the new DB parameter group Finally, you need to update the RDS MySQL Database to use the new DB parameter group that you just created and modified. You can do this by following these steps:

1. In the Amazon RDS console, choose "Instances."
2. Select the RDS MySQL Database instance that you want to modify.
3. Choose "Modify."
4. In the "Modify DB instance" dialog box, select the new DB parameter group that you just created and modified.
5. Choose "Continue."
6. Review the modifications and choose "Modify DB instance."

After completing these steps, the RDS MySQL Database will use the new DB parameter group with the modified max_user_connections parameter. This means that each user account will be limited to a maximum of 10 simultaneous connections.