Scenarios

If you require more flexible deployment, finer-grained monitoring, and more reliable disaster recovery at lower costs, you can upgrade your RDS instance from RDS High-availability Edition to RDS Cluster Edition. RDS Cluster Edition for ApsaraDB RDS for MySQL provides the following features: readable secondary nodes, node addition and deletion, multi-zone disaster recovery, node-level monitoring, and node topology management. RDS Cluster Edition is more cost-effective, flexible, and reliable than RDS High-availability Edition. For more information, see RDS Cluster Edition.

Prerequisites

• The RDS instance runs MySQL 8.0 or MySQL 5.7 on RDS High-availability Edition.

  Note

  You can go to the Basic Information page of your RDS instance to view the RDS edition.

• No read-only RDS instances are attached to the RDS instance.

• The database proxy feature is disabled for the RDS instance.

• The RDS instance uses the Enterprise SSD (ESSD) or general ESSD storage type.

  Note

  If the RDS instance uses the local SSD or standard SSD storage type, you must upgrade the storage type to ESSD or general ESSD and then upgrade the RDS edition to RDS Cluster Edition. For more information, see Change the storage type from local SSD to ESSD or general ESSD or Upgrade the storage type from standard SSDs to ESSDs.

• The RDS instance uses the standard product type.

• The minor engine version of the RDS instance is 20201031 or later.

  Note

  For more information, see Update the minor engine version.

Impacts

• The upgrade may trigger data migration, which may require 10 to 20 minutes to complete. After the migration is complete, the system switches your workloads at the specified switching time. During the switchover, an instance switchover occurs. Make sure that your application is configured to automatically reconnect to your RDS instance. For more information about the impacts of an instance switchover, see Impacts of an instance switchover.

  Note

  After the upgrade, the endpoint of the RDS instance remains unchanged. You do not need to modify application configurations.

• After the upgrade, you cannot downgrade your RDS instance to RDS High-availability Edition.

Billing rules

For more information about the fees for the upgrade, see Specification changes.

Procedure

1. Go to the Instances page. In the top navigation bar, select the region in which the RDS instance resides. Then, find the RDS instance and click the ID of the instance.

2. In the Configuration Information section of the page that appears, click Change Specifications.

3. In the dialog box that appears, select Upgrade and click Next. This step is required only for subscription RDS instances.

4. Configure the following parameters.

   Parameter	Description
   Edition	Select Cluster Edition. Note If Cluster Edition is not displayed on the page, your RDS instance uses local SSDs or standard SSDs. In this case, you must upgrade the storage type of your RDS instance to ESSD or general ESSD and then upgrade the RDS edition to RDS Cluster Edition. For more information, see Change the storage type from local SSD to ESSD or general ESSD or Upgrade the storage type from standard SSDs to ESSDs.
   Storage Type	Select the storage type that you want to use.
   Instance Type	Select the instance type that you want to use.
   Storage Capacity	Select the storage capacity based on your business requirements.
   Switching Time	Valid values: Execute Immediately and Switch Within Maintenance Window. Note Execute Immediately: The data is immediately migrated, which does not affect workloads on the RDS instance. After the data is migrated, an instance switchover is immediately performed. For more information about the impacts of an instance switchover, see Impacts of an instance switchover. Switch Within Maintenance Window: The data is immediately migrated, which does not affect workloads on the RDS instance. After the data is migrated, an instance switchover is performed within the specified maintenance window.

5. Click Pay Now. In the dialog box that appears, confirm the instance information before and after the specification change and click Continue to complete the payment.

6. On the Basic Information section of the Basic Information page, check whether the upgrade is successful. If the value of the Type and Edition parameter of the RDS instance is Regular Instance (Cluster Edition), the upgrade is successful.

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