Overview

The ApsaraDB for RDS instance supports the setting of Dual-Computer High-Availability Version Instances for manual switch-over between the master and slave instances. After the switch-over, the original slave instance becomes a master instance.

• Automatic switch-over: The dual-computer high-availability version instance is automatically switched by default. If you fail to access your instance due to a failure, the fault self-repair module can perform the switch-over between the master and slave instances automatically.
• Manual switch-over: You can conduct the switch-over manually between the master and slave instances on the console wherever necessary.

Prerequisites

This feature only supports the Dual-Computer High-Availability Version.

Descriptions:

• Stand-alone basic version: Not supported temporarily. Because the stand-alone basic version has only one master node and no slave node, this feature does not support this version.
• Dual-computer high-availability version: supports Baidu AI Cloud database RDS for MySQL, but does not support Baidu AI Cloud database RDS for SQL Server and RDS for PostgreSQL temporarily.
• Raft Financial Version: not supported temporarily.

Considerations

• Select to perform the switch-over in the Low Peak Period of the Business. The switch-over between the master and slave instances may result in the interruption and temporary writing stop of your business.
• The persistent connection of the master node should be off. Otherwise, the persistent connection after the switch-over can be available for reading but not for writing.
• The master node does not have a large number of transactions to write, resulting in the impossibility of releasing the long-term occupation lock.
• If a read-only instance is mounted under the instance, the data of the read-only instance is delayed for several minutes due to operations such as synchronizing incremental data after the switch-over between the master and slave instances.

Example of Manual Switch-over Between Master and Slave Instances

1. Log in to RDS Management Console .
2. In the upper left corner of the console page, select the region where the instance resides to enter the "Baidu AI Cloud Database RDS List" page.
3. Find the target instance, and click Instance Name to enter the Instance Details page.

4. Under the "Node Information" module, click the Switch-over between Master and Slave Instances to conduct operations.