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 MySQL provides the following features: readable secondary nodes, node addition and deletion, multi-zone disaster recovery, node-level monitoring, and node topology management. Compared with RDS Basic Edition and RDS High-availability Edition, RDS Cluster Edition for MySQL is more cost-effective, flexible, and reliable. 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 enhanced SSD (ESSD) storage type.

  Note

  If the RDS instance uses the standard SSD storage type, you must upgrade the storage type to ESSD. For more information, see Upgrade the storage type of an ApsaraDB RDS for MySQL instance from standard SSDs to ESSDs.

• The RDS instance uses the x86 architecture.

• 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, ApsaraDB RDS switches your workloads at the specified switching time. During the switchover, a 30-second transient connection occurs. Make sure that your application is configured to automatically reconnect to your RDS instance.

  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
   Editions	Select Cluster Edition.
   Storage Type	Select the storage type that you want to use.
   Instance Type	Select the instance type that you want to use.
   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, the system switches your workloads. A transient connection occurs during the switchover. Switch Within Maintenance Window: The data is immediately migrated, which does not affect workloads on the RDS instance. After the data is migrated, the system switches your workloads within the specified maintenance window. A transient connection occurs during the switchover.

5. Read and select Terms of Service and 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 Instance Type and Edition parameter of the RDS instance is Regular Instance (Cluster Edition), the upgrade is successful.

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