For a PolarDB cluster you subscribed to, you can temporarily upgrade the specifications of the cluster to meet the business peak requirements in the specified validity period of the temporary upgrade.

Prerequisites

  • The cluster is subscription-based.
  • No pending orders of renewal or specification changes are available for the cluster.
  • No pending orders of temporary upgrades are available for the cluser.
  • The product edition must be PolarDB for MySQL Cluster Edition. Both Single Node and Archive Database do not support this feature. For more information about the three editions, see Product editions.

Background information

A temporary upgrade allows you to temporarily upgrade the specifications of a PolarDB cluster to improve overall performance. When the specified restoration time is reached, the specifications of the cluster are automatically restored to the status before the temporary upgrade.

Note PolarDB clusters do not support temporary downgrades. For more information about downgrades, see Change cluster configurations.

Considerations

  • Transient connection errors may occur during the restoration process. Therefore, you must ensure that your application implements an automatic reconnection mechanism.
  • The restoration time must be at least one day earlier than the expiration time of the cluster. For example, if a cluster expires on January 10, the restoration time must be on January 9 at latest.
  • The minimum validity period for a temporary upgrade is one hour. We recommend that you set the validity period to up to 14 days. It is because the restoration time cannot be changed after it is specified.
  • Regular methods of changing specifications are not supported during the temporary upgrade. For more information, see Change cluster configurations.
  • After you perform a temporary upgrade on a cluster, the cluster performance may not meet the business requirements. In this case, you can perform a maximum of one more temporary upgrade before the restoration time is reached. The restoration time that you specify for the second temporary upgrade cannot be earlier than the previous one.

Pricing

The price of a temporary upgrade is 1.5 times the price difference between the original and new specifications. Assume that the validity period of the temporary upgrade is N days. You can calculate the price based on the following formula:

Price = (Monthly subscription fee for the new specifications - Monthly subscription fee for the original specifications)/30 × 1.5 × N

Procedure

  1. Log on to the PolarDB console.
  2. In the upper-left corner of the console, select the region where the cluster resides.
  3. On the Clusters page, find the cluster for which you want to perform a temporary upgrade.
  4. Go to the Change Configurations (Subscription) dialog box by using the following two methods:
    • Find the cluster and click Change Configurations in the Actions column.Clusters
      1. Find the cluster, and click the ID of the cluster to go to the Overview page.
      2. In the Database Nodes section, click Scale.Scale
  5. In the Change Configurations (Subscription) dialog box, select Temporary Upgrade and click OK.
    Note Temporary Upgrade is available for only subscription clusters.
  6. On the page that appears, specify the following parameters.
    Parameter Description
    Node The specifications that you want to select for the upgraded node.
    Restore Time The time when the temporary upgrade expires. When the time is reached, the cluster is restored to the original specifications.
    Note
    • After you perform a temporary upgrade on a cluster, the cluster performance may not meet the business requirements. In this case, you can perform a maximum of one more temporary upgrade before the restoration time is reached. The restoration time that you specify for the second temporary upgrade cannot be earlier than the previous one.
    • The minimum validity period for a temporary upgrade is one hour. We recommend that you set the validity period to up to 14 days. It is because the restoration time cannot be changed after it is specified.
    • The restoration time must be at least one day earlier than the expiration time of the cluster.
  7. Read the service agreement, select the check box, click Buy Now, and then pay for the order.
  8. On the Purchase page, confirm the unpaid order and click Purchase.