Instance Type | Description | Architecture | Visible in the Instance List | Capability |
Primary instance | An instance that can be read from and written to | High-availability edition | Yes | The primary instance can associate with read-only instances to realize read/write separation. |
Read-only instance | An instance that can only be read from | Single-node read-only | Yes | A read-only instance cannot exist on its own. It must instead be associated with a source instance, with its data only being synced from the source instance. It must also reside in the same region as the source instance. By default, up to six read-only instances can be created for a primary instance. |
Edition | Version | Specification Type | CPU and Memory | Disk Capacity | Maximum Number of Connections |
Dual-machine high availability (one primary and one secondary), read-only instance | 10,11,12,13,14,15,16 | General - local high-performance SSD | 1core 2GiB | 10GB - 3000GB | 2048 |
| | | 2core 4GiB | 10GB - 3000GB | 2048 |
| | | 2core 6GiB | 10GB - 3000GB | 2048 |
| | | 4core 8GiB | 10GB - 3000GB | 2048 |
| | | 4core 16GiB | 10GB - 4000GB | 2048 |
| | | 6core 24GiB | 10GB - 4000GB | 2048 |
| | | 8core 16GiB | 10GB - 4000GB | 2048 |
| | | 8core 32GiB | 10GB - 4000GB | 4000 |
| | | 8core 48GiB | 10GB - 4000GB | 4500 |
| | | 12core 24GiB | 10GB - 8000GB | 2048 |
| | | 12core 64GiB | 10GB - 8000GB | 5500 |
| | | 16core 32GiB | 10GB - 8000GB | 4000 |
| | | 16core 96GiB | 10GB - 8000GB | 8000 |
| | | 20core 128GiB | 10GB - 8000GB | 10000 |
| | | 24core 48GiB | 10GB - 8000GB | 4500 |
| | | 24core 192GiB | 10GB - 8000GB | 12000 |
| | | 28core 240GiB | 10GB - 8000GB | 13000 |
| | | 32core 64GiB | 10GB - 8000GB | 5500 |
| | | 48core 480GiB | 10GB - 8000GB | 22000 |
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