Upgrading Two-Node Instances to Three-Node Instances
Last updated:2025-12-16 15:13:39
Overview
This document describes how to upgrade a TencentDB for MySQL instance from two-node to three-node in the console.
Note:
Only TencentDB for MySQL two-node instances can be upgraded to three-node.
Currently, two-node economical instances cannot be upgraded to three-node ones.
The upgrade will not interrupt the instance service.
You can also purchase three-node instances on the purchase page.
Directions
1. Log in to the TencentDB for MySQL console. In the instance list, click an Instance ID or Manage in the Operation column to enter the instance details page.
2. Choose Instance Details > Specification Configurations, and click Upgrade next to Architecture.
3. In the pop-up dialog box, specify the data replication mode and availability zones and click Submit.
Data Replication Mode: For more information, see Database Instance Replication.
Multi-AZ Deployment: Multi-AZ deployment protects database service from being interrupted in case of database failures or availability zone failures.
For a three-node instance, its replicas can be deployed in the source AZ or different AZ. We recommend that you deploy one replica in the source AZ and another replica in a different AZ.
Currently, only some source AZs support selecting different AZs as replica AZs. You can view these source AZs and the supported replica AZs on the purchase page.
Note:
The figure above is the interface for upgrading a yearly/monthly subscription instance to a three-node one, and the interface for upgrading a pay-as-you-go instance to a three-node one is as follows.
4. After the payment is completed, you will be redirected to the instance list. After the status of the instance changes from Changing configuration to Running, it can be used normally.
FAQs
How do I view the architecture information of an instance?
You can log in to the MySQL console, and click Configuration in the instance list to view the architecture information; alternatively, you can click the instance ID or Management in the Operation column to go to the instance details page, select Specification Configuration, and view the architecture information in the Architecture area.
How do I view the source and replica AZs of an instance?
You can log in to the MySQL console, click the instance ID or Management in the Operation column in the instance list to go to the instance details page, select Instance Information, and view the primary and secondary AZs in the AZ area.
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