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TencentDB for MySQL provides cross-AZ and cross-region data disaster recovery solutions to help you deliver continued services at low costs while improving data reliability. It is also applicable to scenarios where compliance is required.

Intra-region disaster recovery

You can create two-node and three-node TencentDB for MySQL instances to support multi-AZ deployment. Physical servers of a multi-AZ instance are deployed in different AZs in the same region. When an AZ fails, the business traffic will be switched to another AZ swiftly, which is transparent to the business and requires no changes at the application layer to achieve intra-region disaster recovery.

Note：

As the nodes of a multi-AZ instance are in different AZs, there may be an additional network sync delay of 2–3 ms.

For more information on how to use this feature, see High Availability (Multi-AZ).

Cross-region disaster recovery

The intra-region disaster recovery capability of TencentDB for MySQL is limited to different AZs in the same region. To further improve the availability, TencentDB for MySQL also supports cross-region data disaster recovery.

You can asynchronously replicate data in a TencentDB for MySQL instance in region A to another instance (disaster recovery instance) in region B through DTS. The disaster recovery instance has an independent connection address, account, and permissions. If a major failure occurs in region A and cannot be fixed in a short time, you can perform failover whenever needed. Specifically, you can quickly forward application requests to the disaster recovery instance simply by modifying the database connection configuration in the application, thereby delivering a finance-grade database availability.

For more information on how to use this feature, see Disaster Recovery Instance.