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    PolarDB:Change instance specifications

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    PolarDB:Change instance specifications

    Last Updated:Jul 04, 2025

    A PolarDB-X instance is a distributed cluster that consists of multiple nodes. Each node provides features such as SQL routing, data merging, and data aggregation. You can change the node specifications for an instance. During peak hours, you can upgrade the specifications to handle high numbers of queries per second (QPS). During off-peak hours, you can downgrade the specifications to reduce the waste of resources.

    Precautions

    • When you change the specifications of an instance, transient connections may occur due to disconnections between your application and the instance. Make sure that your application can automatically reconnect to your instance.

    • You can host your service on Elastic Compute Service (ECS) instances and connect the ECS instances to your PolarDB-X instance. After the specifications of the PolarDB-X instance are upgraded, additional nodes are added to the instance. If persistent connections are established between the ECS instances and the PolarDB-X instance, the newly added nodes cannot receive network traffic immediately after the instance specifications are upgraded. To resolve this issue, we recommend that you restart the ECS instances in phased mode. Restart the ECS instances that run the smallest workloads and analyze the performance of the service. After you confirm that the service runs as expected, you can restart all other ECS instances. You can use the Druid connection pool to connect to PolarDB-X instances. For more information, see Configure a connection pool for an application to connect to a PolarDB-X instance.

    Procedure

    1. Log on to the PolarDB-X console.

    2. In the top navigation bar, select the region where the instance is deployed.

    3. On the Instances page, click the PolarDB-X 2.0 tab.

    4. Locate the instance that you want to manage and click Upgrade or Downgrade in its Actions column.

    5. On the Upgrade/Downgrade or Downgrade page, select the desired specifications for the nodes.

      Note

      For Enterprise Edition instances, you can Upgrade/Downgrade or Downgrade compute node and data node specifications. For Standard Edition instances, you can only Upgrade/Downgrade or Downgrade data node specifications.

    6. Set Switch Mode.

    7. Click Buy Now.

    8. Click Sign and Purchase.

      The instance is displayed a status of Upgrading or Downgrading in the PolarDB-X console until the operation is complete.