This topic describes how to change the configuration of an RDS PPAS instance, including changing the edition, specifications, storage capacity, storage class, and zone.

You can upgrade or downgrade the configuration of an RDS PPAS 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.

Configuration items

If you want to horizontally scale the read capability of an RDS PPAS instance, you can create read-only instances. For more information, see Introduction to PPAS read-only instances and Create a PPAS read-only instance.

Configuration item Description
CPU and Memory

All PPAS DB engine versions and editions support the CPU and memory change.
Capacity

All PPAS DB engine versions and editions allow you to increase storage capacity.

You can only decrease the storage capacity of a subscription instance with local SSDs during instance renewal.

Note
  • For information about the capacity range, see Instance types.
  • You cannot decrease the storage capacity if the RDS instance uses cloud SSDs.
  • If the storage capacity range of the current specifications cannot meet your requirements, you can change the specifications.
Note Changing the preceding configuration does not change the endpoints of the RDS instance.

Billing

For more information, see Specification change fees.

Prerequisites

Your Alibaba Cloud account does not have an unpaid renewal order.

Precautions

When the new configuration is taking effect, the RDS instance may be disconnected for about 30 seconds and most operations related to databases, accounts, and networks cannot be performed. Therefore, we recommend that you change the configuration during off-peak hours or make sure that your application can automatically reconnect to the RDS instance.

Procedure

  1. Log on to the RDS console.
  2. Select the target region.选择地域
  3. Find the target RDS instance and click the instance ID.
  4. On the Basic information page, find the Configuration Information section and click Change Specifications.变成配置
  5. Optional. If the RDS instance uses the subscription billing method, click Next in the displayed dialog box.
  6. On the Change Specifications page, change the instance configuration. For more information, see Configuration items.
  7. Specify the time at which you want to change the configuration.
    • Switch Immediately After Data Migration: Change the configuration immediately after the data migration.
    • Switch Within Maintenance Window: Change the configuration during the maintenance window.
    Note To change the maintenance window, follow these steps:
    1. Click Modify.修改维护时间段
    2. In the Configuration Information section, select a maintenance window and click Save. 修改维护时间段
    3. Go back to the Change Specifications page, refresh the page, and change the configuration again.
  8. Select Terms of Service, Service Level Agreement, and Terms of Use and click Confirm.

FAQ

Do I need to migrate data if I only want to expand the storage capacity of an RDS instance?

Check whether the server where the RDS instance is located provides sufficient storage capacity for expansion. If yes, you do not need to migrate data and can directly expand the storage capacity. If no, you must migrate data to a server that provides sufficient storage capacity before you expand the storage capacity.