AWS RDS Connection Limits
Answer : Solution 1: AWS RDS max_connections limit variable is based on Instance type, so you can upgrade your RDS or make more replica. The RDS types with max_connections limit: t2.micro 66 t2.small 150 m3.medium 296 t2.medium 312 m3.large 609 t2.large 648 m4.large 648 m3.xlarge 1237 r3.large 1258 m4.xlarge 1320 m2.xlarge 1412 m3.2xlarge 2492 r3.xlarge 2540 Referring by max_connections at AWS RDS MySQL Instance Sizes in 2015 Update 2017-07 The current RDS MySQL max_connections setting is default by {DBInstanceClassMemory/12582880} , if you use t2.micro with 512MB RAM, the max_connections could be (512*1024*1024)/12582880 ~= 40, and so on. Each Web server could have many connections to RDS, which depends on your SQL requests from Web server. Solution 2: You can change the max_connections value by either updating the default parameter policy or create a new one - I'd suggest going with the latter. Go to RDS Parameter Groups Create a new ...