A TencentDB instance is a standalone database environment running in Tencent Cloud. It includes multiple databases created by users and can be accessed using the same tools and applications as those for a standalone database instance.
There are three types of instances available in TencentDB for MySQL:
| Instance Type | Definition | Architecture | Visible in the Instance List | Feature |
|---|---|---|---|---|
| Source instance | An instance that can be read from and written to | Yes | A source instance can mount read-only instances and disaster recovery instances for read/write separation and remote disaster recovery | |
| Read-only instance | An instance that can only be read from | Single-node High IO Edition | Yes | A read-only instance cannot exist on its own. Instead, it must be affiliated to a source instance. Its data comes solely from syncing with the source instance, and it must reside in the same region as the source instance. |
| Disaster recovery instance | An instance that supports disaster recovery across AZs and regions | Yes | A disaster recovery instance is read-only when it syncs with a source instance. It can actively stop the sync and be promoted to a source instance for read/write access. The disaster recovery instance should reside in a different region than the source instance does. |
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