Change the configuration of an RDS for PostgreSQL instance

You can upgrade or downgrade the configuration of an RDS for PostgreSQL instance at any time regardless of whether the instance uses the subscription or pay-as-you-go billing method. The new configuration takes effect immediately after you complete the configuration upgrade or downgrade.

Change items

If you want to increase the read capability of a database, you can create read-only instances to relieve the pressure. For more information, see Introduction to RDS for PostgreSQL read-only instances and Create an RDS for PostgreSQL read-only instance.

Billing rules

For more information, see Billing details about configuration change.

Prerequisites

Your Alibaba Cloud account does not have overdue renewal orders.

Precautions

• Your RDS instance may be disconnected for about 30 seconds when the specification changes take effect. During this period, management operations related to databases, accounts, and networks cannot be performed. We recommend that you change the specifications during off-peak hours, or configure automatic reconnection policies for your applications.
• In the Basic Edition, your RDS instance is not attached with any slave instances that can serve as hot backups. Therefore, if your RDS instance breaks down unexpectedly or you are changing the instance configuration or upgrading the instance version, your RDS service may remain unavailable for a long period of time. If you have high availability requirements on databases, we recommend that you use other editions such as the High-availability Edition.

Procedure

1. Log on to the RDS console.
2. Select the target region.
3. Find the target RDS instance and click the instance ID.
4. On the Basic Information page that appears, click Change Specifications in the Configuration Information section.
5. In the dialog box that appears, select the change method and click Next. This step is only required for subscription-based instances.
6. Modify Type and Capacity.
7. Specify the time to change the instance specifications.
   • Switch Immediately After Data Migration: Changing the instance specifications involves underlying data migration. You can change the configuration after data migration.
   • Switch Within Maintenance Window: Your RDS instance may be disconnected for about 30 seconds when the specification changes take effect. During this period, management operations related to databases, accounts, and networks cannot be performed. We recommend that you change the configuration within the maintenance window.
     Note If you want to change the maintenance window, following these steps:

     1. Click Modify.
     2. In the Configuration Information section, change the maintenance window and click Save.
     3. Return to the configuration change page, refresh the page, and change the configuration.
8. On the Change Specifications page, select the Product Terms of Service, click Confirm, and complete the payment.

FAQ

Do I need to migrate data to a new instance if I only expand the capacity?

Check whether there is sufficient storage space on the host where the instance is located for upgrading. If yes, you can upgrade without migrating data. If no, you must migrate data to a host that has enough storage space.

APIs