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RDS cheatsheet

Maximum Concurrent Connections

Aurora

Instance Max Connections
db.t2.small 45
db.t2.medium 90
db.t3.small 45
db.t3.medium 90
db.r3.large 1000
db.r3.xlarge 2000
db.r3.2xlarge 3000
db.r3.4xlarge 4000
db.r3.8xlarge 5000
db.r4.large 1000
db.r4.xlarge 2000
db.r4.2xlarge 3000
db.r4.4xlarge 4000
db.r4.8xlarge 5000
db.r4.16xlarge 6000

MySQL

RDS MySQL max connections are constrained by the formula:

Instance Memory / 12582880

Instance vCPUs Memory (GB) Max Connections
db.t2.micro 1 1 85
db.t2.small 1 2 171
db.t2.medium 2 4 341
db.t2.large 2 8 683
db.t2.xlarge 4 16 1365
db.t2.2xlarge 8 32 2731
db.t3.micro 2 1 85
db.t3.small 2 2 171
db.t3.medium 2 4 341
db.t3.large 2 8 683
db.t3.xlarge 4 16 1365
db.t3.2xlarge 8 32 2731
db.r4.large 2 15.25 1301
db.r4.xlarge 4 30.5 2603
db.r4.2xlarge 8 61 5205
db.r4.4xlarge 16 122 10411
db.r4.8xlarge 32 244 20821
db.r4.16xlarge 64 488 41643

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