Amazon Aurora
User Guide for Aurora (API Version 2014-10-31)

Choosing the DB Instance Class

The DB instance class determines the computation and memory capacity of an Amazon RDS DB instance. The DB instance class you need depends on your processing power and memory requirements.

For more information about instance class pricing, see Amazon RDS Pricing.

DB Instance Class Types

Amazon Aurora supports two types of instance classes: Memory Optimized and Burstable Performance. For more information about Amazon EC2 instance types, see Instance Type in the Amazon EC2 documentation.

The following are the Memory Optimized DB instance classes available:

  • db.r4 – Current-generation instance classes optimized for memory-intensive applications. These offer improved networking and Amazon EBS performance.

  • db.r3 – Previous-generation instance classes that provide memory optimization and more computing capacity than the db.m2 instance classes. The db.r3 instances classes are not available in the EU (Paris) region.

The following are the Burstable Performance DB instance classes available:

  • db.t2 – Instance classes that provide a baseline performance level, with the ability to burst to full CPU usage. We recommend using these instance classes only for development and test servers, or other nonproduction servers.

Specifications for All Available DB Instance Classes for Aurora

The following table provides details of the Amazon RDS DB instance classes available for Amazon Aurora. The table columns are explained after the table.

Instance Class vCPU1 ECU2 Memory3 (GiB) VPC Only4 EBS Optimized5 Max. Bandwidth6 (Mbps) Network Performance7 Aurora MySQL Aurora PostgreSQL
db.r4 – Latest Generation Memory Optimized Instance Classes
db.r4.16xlarge 64 195 488 Yes Yes 14,000 25 Gbps 1.14.4 and later Yes
db.r4.8xlarge 32 99 244 Yes Yes 7,000 10 Gbps 1.14.4 and later Yes
db.r4.4xlarge 16 53 122 Yes Yes 3,500 Up to 10 Gbps 1.14.4 and later Yes
db.r4.2xlarge 8 27 61 Yes Yes 1,750 Up to 10 Gbps 1.14.4 and later Yes
db.r4.xlarge 4 13.5 30.5 Yes Yes 875 Up to 10 Gbps 1.14.4 and later Yes
db.r4.large 2 7 15.25 Yes Yes 437 Up to 10 Gbps 1.14.4 and later Yes
db.r3 – Current Generation Memory Optimized Instance Classes
db.r3.8xlarge 32 104 244 No No 10 Gbps Yes No
db.r3.4xlarge 16 52 122 No Yes 2,000 High Yes No
db.r3.2xlarge 8 26 61 No Yes 1,000 High Yes No
db.r3.xlarge 4 13 30.5 No Yes 500 Moderate Yes No
db.r3.large 2 6.5 15.25 No No Moderate Yes No
db.t2 – Current Generation Burstable Performance Instance Classes
db.t2.medium 2 Variable 4 Yes No Moderate Yes No
db.t2.small 1 Variable 2 Yes No Low Yes No
  1. vCPU – The number of virtual central processing units (CPUs). A virtual CPU is a unit of capacity that you can use to compare DB instance classes. Instead of purchasing or leasing a particular processor to use for several months or years, you are renting capacity by the hour. Our goal is to provide a consistent amount of CPU capacity no matter what the actual underlying hardware.

  2. ECU – The relative measure of the integer processing power of an Amazon EC2 instance. To make it easy for developers to compare CPU capacity between different instance classes, we have defined an Amazon EC2 Compute Unit. The amount of CPU that is allocated to a particular instance is expressed in terms of these EC2 Compute Units. One ECU currently provides CPU capacity equivalent to a 1.0–1.2 GHz 2007 Opteron or 2007 Xeon processor.

  3. Memory (GiB) – The RAM memory, in gibibytes, allocated to the DB instance. There is often a consistent ratio between memory and vCPU. For example, the db.m1 instance class has the same memory to vCPU ratio as the db.m3 instance class, but for most use cases the db.m3 instance class provides better, more consistent performance, than the db.m1 instance class.

  4. VPC Only – The instance class is supported only for DB instances that are in a Virtual Private Cloud (VPC).

  5. EBS-Optimized – The DB instance uses an optimized configuration stack and provides additional, dedicated capacity for I/O. This optimization provides the best performance by minimizing contention between I/O and other traffic from your instance. For more information about Amazon EBS–optimized instances, see Amazon EBS–Optimized Instances in the Amazon EC2 documentation.

  6. Max. Bandwidth (Mbps) – The maximum bandwidth in megabits per second. Divide by 8 to get the expected throughput in megabytes per second.


    For general purpose (gp2) storage, the maximum throughput is 1,280 Mbps (160 MB/s).

  7. Network Performance – The network speed relative to other DB instance classes.