This topic provides an overview of read-only ApsaraDB RDS instance types. The overview includes the latest specifications of each instance type.

ApsaraDB RDS allows you to create read-only RDS instances. These read-only RDS instances are used to increase the read capability of your database system. For more information about read-only instances, see Overview of read-only ApsaraDB RDS for MySQL instances.

For more information about primary ApsaraDB RDS instance types, see Primary instance types.

Pricing

For more information about the prices of read-only RDS instances, see the following file:

Prices for Subscription Read-only ApsaraDB RDS Instances (Specifications)

For more information about the prices of pay-as-you-go RDS instances and storage capacities, visit the following pages:

Read-only ApsaraDB RDS for MySQL instances

Role MySQL version Instance family Instance type CPU and memory specifications Maximum number of connections Maximum IOPS Storage capacity
Read-only instance 5.6, 5.7, and 8.0 General-purpose instance family rds.mysql.t1.small 1 CPU core, 1 GB 300 600 5 GB to 2,000 GB
rds.mysql.s1.small 1 CPU core, 2 GB 600 1,000
rds.mysql.s2.large 2 CPU cores, 4 GB 1,200 2,000
rds.mysql.s2.xlarge 2 CPU cores, 8 GB 2,000 4,000
rds.mysql.s3.large 4 CPU cores, 8 GB 2,000 5,000
rds.mysql.m1.medium 4 CPU cores, 16 GB 4,000 7,000
rds.mysql.c1.large 8 CPU cores, 16 GB 4,000 8,000
rds.mysql.c1.xlarge 8 CPU cores, 32 GB 8,000 12000
rds.mysql.c2.xlarge 16 CPU cores, 64 GB 16,000 14000 5 GB to 3,000 GB
rds.mysql.c2.xlp2 16 CPU cores, 96 GB 24,000 16000
Dedicated instance family (with a large memory capacity) mysqlro.x8.medium.1 2 CPU cores, 16 GB 2,500 4,500 50 GB to 2,000 GB
mysqlro.x8.large.1 4 CPU cores, 32 GB 5,000 9,000 50 GB to 2,000 GB
mysqlro.x8.xlarge.1 8 CPU cores, 64 GB 10,000 18,000 500 GB to 3,000 GB
mysqlro.x8.2xlarge.1 16 CPU cores, 128 GB 20,000 36,000 500 GB to 3,000 GB
mysqlro.x8.4xlarge.1 32 CPU cores, 256 GB 40,000 72,000 1,000 GB to ,6000 GB
mysqlro.x8.8xlarge.1 64 CPU cores, 512 GB 80000 144,000 1,000 GB to 6,000 GB
Dedicated instance family (with a large number of CPU cores) mysqlro.x4.large.1 4 CPU cores, 16 GB 2500 4,500 50 GB to 2,000 GB
mysqlro.x4.xlarge.1 8 CPU cores, 32 GB 5,000 9,000 500 GB to 3,000 GB
mysqlro.x4.2xlarge.1 16 CPU cores, 64 GB 10,000 18,000 500 GB to 3,000 GB
mysqlro.x4.4xlarge.1 32 CPU cores, 128 GB 20,000 36,000 1,000 GB to 6,000 GB

Read-only ApsaraDB RDS for SQL Server instances

Role SQL Server version Instance family Instance type CPU and memory specifications Maximum number of connections Maximum IOPS Storage capacity
Read-only instance 2017 EE General-purpose instance family rds.mssql.s2.large 2 CPU cores, 4 GB Unlimited For more information, see IOPS. 20 GB to 4,000 GB
rds.mssql.s3.large 4 CPU cores, 8 GB
rds.mssql.c1.large 8 CPU cores, 16 GB
rds.mssql.s2.xlarge 2 CPU cores, 8 GB
rds.mssql.m1.medium 4 CPU cores, 16 GB
rds.mssql.c1.xlarge 8 CPU cores, 32 GB
rds.mssql.c2.xlarge 16 CPU cores, 64 GB
Dedicated instance family mssql.x4.medium.ro 2 CPU cores, 8 GB
mssql.x4.large.ro 4 CPU cores, 16 GB
mssql.x4.xlarge.ro 8 CPU cores, 32 GB
mssql.x4.2xlarge.ro 16 CPU cores, 64 GB
mssql.x4.4xlarge.ro 32 CPU cores, 128 GB
mssql.x4.8xlarge.ro 64 CPU cores, 256 GB
mssql.x8.medium.ro 2 CPU cores, 16 GB
mssql.x8.large.ro 4 CPU cores, 32 GB
mssql.x8.xlarge.ro 8 CPU cores, 64 GB
mssql.x8.2xlarge.ro 16 CPU cores, 128 GB
mssql.x8.4xlarge.ro 32 CPU cores, 256 GB
mssql.x8.7xlarge.ro 56 CPU cores, 480 GB
mssql.x8.8xlarge.ro 64 CPU cores, 512 GB

Read-only ApsaraDB RDS for PostgreSQL instances (with local SSDs)

Role PostgreSQL version Instance family Instance type CPU and memory specifications Maximum number of connections Maximum IOPS Storage capacity
Read-only instance

10

Dedicated instance family (with a large memory capacity) pg.x8.xlarge.2 8 CPU cores, 64 GB 10,000 18,000 20 GB to 6,000 GB
pg.x8.2xlarge.2 16 CPU cores, 128 GB 12,000 36,000
Dedicated instance family (with a large number of CPU cores) pg.x4.xlarge.2 8 CPU cores, 32 GB 5,000 9,000
pg.x4.2xlarge.2 16 CPU cores, 64 GB 10,000 18,000
pg.x4.4xlarge.2 32 CPU cores, 128 GB 12,000 36,000
Dedicated host instance family rds.pg.st.h43 60 CPU cores, 470 GB 4,000 50,000

Read-only ApsaraDB RDS for PPAS instances

Role PPAS version Instance family Instance type CPU and memory specifications Maximum number of connections Maximum IOPS Storage capacity
Read-only instance

10

General-purpose instance family rds.ppas.t1.small 1 CPU core, 1 GB 100 1,200 150 GB
Dedicated instance family ppas.x4.small.2 1 CPU core, 4 GB 200 5,000 250 GB
ppas.x4.medium.2 2 CPU cores, 8 GB 400 10,000
ppas.x8.medium.2 2 CPU cores, 16 GB 2,500 15,000
ppas.x4.large.2 4 CPU cores, 16 GB 2,500 20,000 250 GB or 500 GB
ppas.x8.large.2 4 CPU cores, 32 GB 5,000 30,000
ppas.x4.xlarge.2 8 CPU cores, 32 GB 5,000 40,000 500 GB or 1,000 GB
ppas.x8.xlarge.2 8 CPU cores, 64 GB 10,000 60,000
ppas.x4.2xlarge.2 16 CPU cores, 64 GB 10,000 80,000 1,000 GB or 2,000 GB
ppas.x8.2xlarge.2 16 CPU cores, 128 GB 12,000 120,000
ppas.x4.4xlarge.2 32 CPU cores, 128 GB 12,000 160,000 2,000 GB or 3,000 GB
ppas.x8.4xlarge.2 32 CPU cores, 256 GB 12,000 240,000
Dedicated host instance family rds.ppas.st.h43 60 CPU cores, 470 GB 12,000 450,000 3,000 GB, 4,000 GB, 5,000 GB, or 6,000 GB