Instance Type | Definition | Architecture | Visible in Instance List or Not | Function |
Primary Instance | Instance that can read and write | Yes | A primary instance can mount read-only instances and disaster recovery instances to implement read-write separation and remote disaster recovery. The single-node architecture does not support mounting read-only instances or disaster recovery instances. | |
Read-Only Instance | Read-only instance that uses the TXSQL kernel | Yes | A read-only instance cannot exist independently. It must belong to a primary instance, and its only data source is data synchronized from the primary instance. | |
Read-only analysis engine instance | A type of read-only instance that uses the LibraDB kernel | Single-Node | Yes | A read-only analysis engine cannot exist independently. It must belong to a primary instance, and its only data source is data synchronized from the primary instance. It can only be in the same region as the primary instance. It uses the LibraDB kernel as a columnar storage replica. |
Disaster recovery instance | Instance that provides cross-AZ and cross-region disaster recovery capabilities | Yes | A disaster recovery instance is read-only during synchronization. It can actively disconnect the synchronization relationship with the primary instance and promote itself to a primary instance to provide read and write access. It is recommended to deploy the disaster recovery instance in a different region from the primary instance. |
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