If you configure a connection limit that's very high, you might end up with higher memory usage even if those connections aren’t used. Sleeping connections: Sleeping connections that are also known as inactive open connections are caused when you set higher values for connection timeout parameters, such as wait_timeout or interactive_timeout in MySQL. To view the connections for each database for your RDS for PostgreSQL instance, run the following command: SELECT datname, numbackends FROM pg_stat_database To list all active connections for your RDS for MySQL DB instance, run the following command: SHOW FULL PROCESSLIST Over time, these new server connections can cause your instance to exceed the max_connections value. Improperly closing a client or application connection after the end of an operation: When a server connection isn't properly closed, the client application opens up a new connection. Increase in the number of client or application connections to the DB instance: This is caused by an increased workload or table/row-level locking. The following factors might cause your database connections to exceed the max_connections value:
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