This topic introduces the read-only instance types supported by ApsaraDB for RDS.

You can add read-only instances to scale the read capability of your database system.

For more information about primary instance types, see Instance types.

ApsaraDB RDS for MySQL read-only instances

Category MySQL version Instance family Instance type CPU and memory Maximum number of connections Maximum IOPS Storage capacity
Read-only instance 5.6, 5.7, and 8.0 General-purpose instance rds.mysql.t1.small 1 core, 1 GB 300 600 5 GB to 2,000 GB
rds.mysql.s1.small 1 core, 2 GB 600 1,000
rds.mysql.s2.large 2 cores, 4 GB 1,200 2,000
rds.mysql.s2.xlarge 2 cores, 8 GB 2,000 4,000
rds.mysql.s3.large 4 cores, 8 GB 2,000 5,000
rds.mysql.m1.medium 4 cores, 16 GB 4,000 7,000
rds.mysql.c1.large 8 cores, 16 GB 4,000 8,000
rds.mysql.c1.xlarge 8 cores, 32 GB 8,000 12,000
rds.mysql.c2.xlarge 16 cores, 64 GB 16,000 14,000 5 GB to 3,000 GB
rds.mysql.c2.xlp2 16 cores, 96 GB 24,000 16,000
Dedicated instance (with a large memory capacity) mysqlro.x8.medium.1 2 cores, 16 GB 2,500 4,500 50 GB to 2,000 GB
mysqlro.x8.large.1 4 cores, 32 GB 5,000 9,000 50 GB to 2,000 GB
mysqlro.x8.xlarge.1 8 cores, 64 GB 10,000 18,000 500 GB to 3,000 GB
mysqlro.x8.2xlarge.1 16 cores, 128 GB 20,000 36,000 500 GB to 3,000 GB
mysqlro.x8.4xlarge.1 32 cores, 256 GB 40,000 72,000 1,000 GB to 6,000 GB
mysqlro.x8.8xlarge.1 64 cores, 512 GB 80,000 144,000 1,000 GB to 6,000 GB
Dedicated instance (with a large number of CPU cores) mysqlro.x4.large.1 4 cores, 16 GB 2,500 4,500 50 GB to 2,000 GB
mysqlro.x4.xlarge.1 8 cores, 32 GB 5,000 9,000 500 GB to 3,000 GB
mysqlro.x4.2xlarge.1 16 cores, 64 GB 10,000 18,000 500 GB to 3,000 GB
mysqlro.x4.4xlarge.1 32 cores, 128 GB 20,000 36,000 1,000 GB to 6,000 GB

ApsaraDB RDS for SQL Server read-only instances

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

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

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

9.4 and 10

General-purpose instance rds.pg.s1.small 1 core, 2 GB 200 1,000 20 GB to 6,000 GB
rds.pg.s2.large 2 cores, 4 GB 400 2,000
rds.pg.s3.large 4 cores, 8 GB 800 5,000
rds.pg.c1.large 8 cores, 16 GB 1,500 8,000
rds.pg.c1.xlarge 8 cores, 32 GB 2,000 12,000
rds.pg.c2.xlarge 16 cores, 64 GB 2,000 14,000
Dedicated instance (with a large memory capacity) pg.x8.medium.2 2 cores, 16 GB 2,500 4,500
pg.x8.large.2 4 cores, 32 GB 5,000 9,000
pg.x8.xlarge.2 8 cores, 64 GB 10,000 18,000
pg.x8.2xlarge.2 16 cores, 128 GB 12,000 36,000
Dedicated host rds.pg.st.h43 60 cores, 470 GB 4,000 50,000

ApsaraDB RDS for PPAS read-only instances

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

10

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