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Hello.
Have you changed the "max_connections" value set in the RDS Aurora parameter group?
By default, if you increase the instance size, the maximum number of connections will also increase.
https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/AuroraMySQL.Managing.Performance.html
Also, when connecting to RDS from an application, is the connection properly disconnected at the end of processing?
In other words, I think it is necessary to check whether there are any unnecessary connections remaining.
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I am not sure I am disconnecting properly I have upped the
max_connectionsto 1000If this happens, I think it is possible that the application is not properly disconnecting from the database.