DB Instance Introduction
- Single
- Primary/Standby
- Cluster
Different series support different DB engines and instance specifications.
DB Instance Type |
Description |
Notes |
Scenarios |
---|---|---|---|
Single |
Uses a single-node architecture. More cost-effective than the mainstream primary/standby DB instances. |
If a fault occurs on a single instance, the instance cannot recover in a timely manner. |
|
Primary/Standby |
Uses an HA architecture. A pair of primary and standby DB instances shares the same IP address and can be deployed in different AZs. |
|
|
Cluster |
Uses the Microsoft Always On architecture with one master node, one slave node, and up to five read-only nodes. It features higher availability, reliability, and scalability. |
Only for RDS for SQL Server. |
|
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