This topic describes the default read weights for ApsaraDB RDS for PostgreSQL instances that use different specifications. If you set Read Weight Distribution to Automatic when you create a database proxy terminal, you can check the default read weights for RDS instances that use different specifications in this topic.
Primary RDS instances
| Instance type | CPU and memory specifications | Read weight |
|---|---|---|
| pg.n2.small.1 | 1 core, 2 GB | 100 |
| pg.n2.medium.1 | 2 cores, 4 GB | 200 |
| pg.n4.medium.1 | 2 cores, 8 GB | 200 |
| pg.x2.medium.2c | 2 cores, 4 GB | 200 |
| pg.x4.medium.2c | 2 cores, 8 GB | 200 |
| pg.x4t.medium.2c | 2 cores, 8 GB | 200 |
| pg.x8.medium.2c | 2 cores, 16 GB | 200 |
| pg.x8t.medium.2c | 2 cores, 16 GB | 200 |
| pg.n2.large.1 | 4 cores, 8 GB | 400 |
| pg.n4.large.1 | 4 cores, 16 GB | 400 |
| pg.x2.large.2c | 4 cores, 8 GB | 400 |
| pg.x2t.large.2c | 4 cores, 8 GB | 400 |
| pg.x4.large.2c | 4 cores, 16 GB | 400 |
| pg.x4t.large.2c | 4 cores, 16 GB | 400 |
| pg.x8.large.2c | 4 cores, 32 GB | 400 |
| pg.x8t.large.2c | 4 cores, 32 GB | 400 |
| pg.n2.xlarge.1 | 8 cores, 16 GB | 800 |
| pg.n4.xlarge.1 | 8 cores, 32 GB | 800 |
| pg.x2.xlarge.2c | 8 cores, 16 GB | 800 |
| pg.x2t.xlarge.2c | 8 cores, 16 GB | 800 |
| pg.x4.xlarge.2c | 8 cores, 32 GB | 800 |
| pg.x4t.xlarge.2c | 8 cores, 32 GB | 800 |
| pg.x8.xlarge.2c | 8 cores, 64 GB | 800 |
| pg.x8t.xlarge.2c | 8 cores, 64 GB | 800 |
| pg.x2.3large.2c | 12 cores, 24 GB | 1,200 |
| pg.x2t.3large.2c | 12 cores, 24 GB | 1,200 |
| pg.x4.3large.2c | 12 cores, 48 GB | 1,200 |
| pg.x4t.3large.2c | 12 cores, 48 GB | 1,200 |
| pg.x8.3large.2c | 12 cores, 96 GB | 1,200 |
| pg.x8t.3large.2c | 12 cores, 96 GB | 1,200 |
| pg.n2.2xlarge.1 | 16 cores, 32 GB | 1,600 |
| pg.n4.2xlarge.1 | 16 cores, 64 GB | 1,600 |
| pg.n8.2xlarge.1 | 16 cores, 128 GB | 1,600 |
| pg.x2.2xlarge.2c | 16 cores, 32 GB | 1,600 |
| pg.x2t.2xlarge.2c | 16 cores, 32 GB | 1,600 |
| pg.x4.2xlarge.2c | 16 cores, 64 GB | 1,600 |
| pg.x4t.2xlarge.2c | 16 cores, 64 GB | 1,600 |
| pg.x8.2xlarge.2c | 16 cores, 128 GB | 1,600 |
| pg.x8t.2xlarge.2c | 16 cores, 128 GB | 1,600 |
| pg.x2.3xlarge2c | 24 cores, 48 GB | 2,400 |
| pg.x2t.3xlarge.2c | 24 cores, 48 GB | 2,400 |
| pg.x4.3xlarge.2c | 24 cores, 96 GB | 2,400 |
| pg.x4t.3xlarge.2c | 24 cores, 96 GB | 2,400 |
| pg.x8.3xlarge.2c | 24 cores, 192 GB | 2,400 |
| pg.x8t.3xlarge.2c | 24 cores, 192 GB | 2,400 |
| pg.n4.4xlarge.1 | 32 cores, 128 GB | 3,200 |
| pg.n8.4xlarge.1 | 32 cores, 256 GB | 3,200 |
| pg.x2.4xlarge.2c | 32 cores, 64 GB | 3,200 |
| pg.x2t.4xlarge.2c | 32 cores, 64 GB | 3,200 |
| pg.x4.4xlarge.2c | 32 cores, 128 GB | 3,200 |
| pg.x4t.4xlarge.2c | 32 cores, 128 GB | 3,200 |
| pg.x8.4xlarge.2c | 32 cores, 256 GB | 3,200 |
| pg.x8t.4xlarge.2c | 32 cores, 256 GB | 3,200 |
| pg.x2.13large.2c | 52 cores, 104 GB | 5,200 |
| pg.x4.13large.2c | 52 cores, 192 GB | 5,200 |
| pg.x8.13large.2c | 52 cores, 384 GB | 5,200 |
| pg.n4.8xlarge.1 | 56 cores, 256 GB | 5,600 |
| pg.n8.8xlarge.1 | 56 cores, 512 GB | 5,600 |
| pg.x2.8xlarge.2c | 64 cores, 128 GB | 6,400 |
| pg.x2t.8xlarge.2c | 64 cores, 128 GB | 6,400 |
| pg.x4.8xlarge.2c | 64 cores, 256 GB | 6,400 |
| pg.x4t.8xlarge.2c | 64 cores, 256 GB | 6,400 |
| pg.x8.8xlarge.2c | 64 cores, 512 GB | 6,400 |
| pg.x8t.8xlarge.2c | 64 cores, 512 GB | 6,400 |
| pg.x2.13xlarge.2c | 104 cores, 192 GB | 10,400 |
| pg.x4.13xlarge.2c | 104 cores, 384 GB | 10,400 |
| pg.x8.13xlarge.2c | 104 cores, 768 GB | 10,400 |
Read-only RDS instances
| Instance type | CPU and memory specifications | Read weight |
|---|---|---|
| pgro.x2.medium.1c | 2 cores, 4 GB | 200 |
| pgro.x4.medium.1c | 2 cores, 8 GB | 200 |
| pgro.x8.medium.1c | 2 cores, 16 GB | 200 |
| pgro.x2.large.1c | 4 cores, 8 GB | 400 |
| pgro.x4.large.1c | 4 cores, 16 GB | 400 |
| pgro.x8.large.1c | 4 cores, 32 GB | 400 |
| pgro.x2.xlarge.1c | 8 cores, 16 GB | 800 |
| pgro.x4.xlarge.1c | 8 cores, 32 GB | 800 |
| pgro.x8.xlarge.1c | 8 cores, 64 GB | 800 |
| pgro.x2.3large.1c | 12 cores, 24 GB | 1,200 |
| pgro.x4.3large.1c | 12 cores, 48 GB | 1,200 |
| pgro.x8.3large.1c | 12 cores, 96 GB | 1,200 |
| pgro.x2.2xlarge.1c | 16 cores, 32 GB | 1,600 |
| pgro.x4.2xlarge.1c | 16 cores, 64 GB | 1,600 |
| pgro.x8.2xlarge.1c | 16 cores, 128 GB | 1,600 |
| pgro.x2.3xlarge.1c | 24 cores, 48 GB | 2,400 |
| pgro.x4.3xlarge.1c | 24 cores, 96 GB | 2,400 |
| pgro.x8.3xlarge.1c | 24 cores, 192 GB | 2,400 |
| pgro.x2.4xlarge.1c | 32 cores, 64 GB | 3,200 |
| pgro.x4.4xlarge.1c | 32 cores, 128 GB | 3,200 |
| pgro.x8.4xlarge.1c | 32 cores, 256 GB | 3,200 |
| pgro.x2.13large.1c | 52 cores, 104 GB | 5,200 |
| pgro.x4.13large.1c | 52 cores, 192 GB | 5,200 |
| pgro.x8.13large.1c | 52 cores, 384 GB | 5,200 |
| pgro.x2.8xlarge.1c | 64 cores, 128 GB | 6,400 |
| pgro.x4.8xlarge.1c | 64 cores, 256 GB | 6,400 |
| pgro.x8.8xlarge.1c | 64 cores, 512 GB | 6,400 |
| pgro.x2.13xlarge.1c | 104 cores, 192 GB | 10,400 |
| pgro.x4.13xlarge.1c | 104 cores, 384 GB | 10,400 |
| pgro.x8.13xlarge.1c | 104 cores, 768 GB | 10,400 |