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PolarDB:Overview

Last Updated:Mar 11, 2024

This topic describes the cluster specification change feature and its common scenarios.

PolarDB allows you to dynamically change the specifications of a cluster within just a few minutes. You do not need to lock databases when you change the specifications of the cluster. The cluster specification change feature supports the following three types of scaling:

  • Scale-up or scale-down of computing capacity: The specifications of the cluster are upgraded or downgraded. You can change the specifications of the primary and read-only nodes separately. This means that the specifications of read-only nodes do not have to be the same as those of the primary node.

    Note

    PolarDB clusters provide a more flexible specification change solution. The specifications of read-only nodes can be changed separately and do not need to be the same as the specifications of the primary node. You can specify different specifications for different nodes based on your business requirements.

  • Scale-in or scale-out of computing capacity: Read-only nodes are added or removed. A maximum of 16 computing nodes can be added.

  • Scale-in or scale-out of storage capacity: The storage capacity that is billed by using the pay-as-you-go method can be scaled in serverless mode. The storage capacity is automatically adjusted as the storage usage increases or decreases. The storage capacity that is billed by using the subscription method can only be scaled manually. If you need to store a large volume of data, we recommend that you purchase storage plans to reduce costs. For more information, see Purchase a storage plan.

Cluster specification changes support the following scenarios: