Configuring Read Replicas

Scenarios

You can add and delete read replicas and change their specifications for GaussDB instances to meet read service requirements.

Precautions

• Read replica-related operations are supported for centralized (1 primary + 2 standby) instances of version V2.0-2.7.1 or later.
• Read replica-related operations are supported for centralized (1 primary + 1 standby + 1 log) instances of version V2.0-8.0.0 or later.
• After snapshot-based backup is enabled, read replicas cannot be added.

Adding a Read Replica

1. Log in to the management console.
2. Click in the upper left corner and select a region and project.
3. Click in the upper left corner of the page and choose Databases > GaussDB.
4. On the Instances page, click the name of the target instance to go to the Basic Information page.
5. In the Configuration area, click Add in the Read Replicas field.
6. Select the specifications and parameter template of the read replica, and click Add Read Replica.
   Figure 1 Adding a read replica
   

7. Click Next, confirm the information, and click Submit.
8. Check the result of adding a read replica.

   On the Instances page, the instance status is Creating read replicas. After the instance status becomes Available, click the instance name. On the Basic Information page, check the number of read replicas.

Deleting a Read Replica

1. Log in to the management console.
2. Click in the upper left corner and select a region and project.
3. Click in the upper left corner of the page and choose Databases > GaussDB.
4. On the Instances page, click the name of the target instance to go to the Basic Information page.
5. In the Configuration area, click Delete in the Read Replicas field.
6. Select the read replica to be deleted and click Next.
7. Confirm the information and click Submit.
8. Check the result of deleting a read replica.

   On the Instances page, the instance status is Deleting a read replica. After the instance status becomes Available, click the instance name. On the Basic Information page, check the number of read replicas.

Changing the Specifications of Read Replicas

1. Log in to the management console.
2. Click in the upper left corner and select a region and project.
3. Click in the upper left corner of the page and choose Databases > GaussDB.
4. On the Instances page, click the name of the target instance to go to the Basic Information page.
5. In the Configuration area, click Change in the Read Replicas field.
6. On the displayed page, select the target read replica and new specifications, and click Next.
7. Confirm the specifications and click Submit.
8. Check the specification change result.

   After the task is submitted, click Go to Instance List. On the Instances page, the instance status is Changing instance specifications. After a few minutes, check the new instance specifications on the Basic Information page.