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How to configure max_connections at AWS RDS MySQL instance sizes?

RDS does not have constraints on the number of connections supported.

This number is determined by the default value and value range of the DB engine.

Changing the Maximum Number of Connections

You can change the maximum number of connections using commands.

1. Firstly, query the maximum number of connections.show global variables like ‘max_connections’;
2. Then, change the value of max_connections under mysqld in the my.cnf file.[mysqld] max_connections = 1000

Setting the Maximum Number of RDS for MySQL Connections to an Appropriate Value

• In addition to the value of max_connections, the maximum number of concurrent client connections allowed by MySQL is also limit by the maximum number of files that can open by a single process in the operating system.
• Then, the maximum number of MySQL connections can modify to any amount allowed by your instance specifications.

The maximum number of connections supported is closely related to the instance memory.

Configuring the max_connections parameter

Make sure to consider the following best practices when working with the max_connections parameter for your DB instance:

• Firstly, the default connection limits are tuned for systems that use the default values for other major memory consumers.

It’s a best practice to scale up the instance class, instead of changing the instance class value.

However, if your instances have a lot of free memory, then you can manually change this parameter.

• Then, set the max_connections value slightly higher than the maximum number of connections you expect to open on each DB instance.
• Next, If you also enabled Performance Schema, then pay close attention to the max_connections parameter setting.

The Performance Schema memory structures are sized automatically based on server configuration variables.

The higher you set the variable, the more memory Performance Schema uses.

• Finally, when you tune the max_connections parameter, make sure to also review the following MySQL connection-related parameters:

wait_timeout: Number of seconds the server waits for activity on a non-interactive TCP/IP or Unix File connection before closing it.

interactive_timeout: Number of seconds the server waits for activity on an interactive connection before closing it.

net_read_timeout: Number of seconds to wait for more data from a TCP/IP connection before dropping the read.

net_write_timeout: Number of seconds to wait on TCP/IP connections for a block to written before dropping the write.

max_execution_time: Execution timeout for SELECT statements, in milliseconds.

max_connect_errors: A host is block from further connections if there are more than this number of interrupted connections.

max_user_connections: Maximum number of simultaneous connections allowed to any given MySQL account.

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Conclusion

To sum up, our skilled Support Engineers at Bobcares demonstrated how to configure max_connections at AWS RDS MySQL instance sizes