This topic describes how to purchase a pay-as-you-go cluster in the PolarDB console.


An Alibaba Cloud account is registered and is used to log on to the Alibaba Cloud Management Console. For more information, see Register and log on to an Alibaba Cloud account.

Background information

A cluster consists of one primary node and a maximum of 15 read-only nodes. To ensure high availability, at least one read-only node is required to implement the active-active architecture. A node is a virtual database server. You can create and manage multiple databases on a node.

  • PolarDB for Oracle supports only Virtual Private Cloud (VPC). Each VPC is an isolated network on Alibaba Cloud and is more secure than the classic network.
  • To fully leverage the performance capacity of PolarDB, your PolarDB cluster needs to be deployed in the same internal network with other Alibaba Cloud services. We recommend that you deploy PolarDB clusters and Elastic Compute Service (ECS) instances in the same VPC to make full use of the capabilities provided by PolarDB. If your ECS instance is deployed in the classic network, you must migrate the ECS instance to a VPC..


  1. Log on to the PolarDB console.
  2. In the upper-left corner of the page, click Create Cluster.
  3. Set the Product Type parameter to Pay-As-You-Go.
  4. Configure the parameters described in the following table.
    Parameter Description
    Creation Method The method that is used to create a PolarDB cluster.
    • Create Primary Cluster: creates a PolarDB cluster.
    • Restore from Recycle: creates a cluster by restoring a backup file of a deleted cluster from the recycle bin.
      • Source Version: the version of the cluster that is deleted.
      • Deleted Clusters: the name of the cluster that is deleted.
      • Backup History: the backup file that you want to restore.
    Note You can select other options to create databases of other engines.
    Region The region in which you want to create a cluster. After the cluster is created, the region cannot be changed.
    Note Make sure that the PolarDB cluster and the ECS instance to which you want to connect are deployed in the same region. Otherwise, the PolarDB cluster and the ECS instance can communicate only over the Internet, which degrades cluster performance.
    Primary Availability Zone The primary zone in which the cluster is deployed.
    • A zone is an independent geographical location in a region. All zones in a region provide the same level of service performance.
    • You can deploy your PolarDB cluster and ECS instance in the same zone or in different zones.
    • You need to specify only the primary zone. The system automatically selects a secondary zone.
    Network Type The value of this parameter is fixed to VPC. You do not need to change this value.


    Make sure that the PolarDB cluster and the ECS instance to which you want to connect are deployed in the same VPC. Otherwise, the cluster and the ECS instance cannot communicate over a VPC, which degrades cluster performance.
    • If an existing VPC meets your network requirements, select the VPC. For example, if you have created an ECS instance and the VPC to which the ECS instance is connected meets your network requirements, select this VPC.
    • Otherwise, use the default VPC and the default vSwitch.
      • Default VPC:
        • Only one VPC is specified as the default VPC in the region that you select.
        • The default VPC uses a 16-bit subnet mask. For example, the CIDR block provides up to 65,534 private IP addresses.
        • The default VPC does not consume the quota of the VPCs that you can create on Alibaba Cloud.
      • Default vSwitch:
        • Only one vSwitch is specified as the default vSwitch in the zone that you select.
        • The default VPC uses a 20-bit subnet mask. For example, the CIDR block provides up to 4,094 private IP addresses.
        • The default vSwitch does not consume the quota of the vSwitches that you can create in a VPC.
    • If the default VPC and vSwitch cannot meet your business requirements, you can create your own VPC and vSwitch. For more information, see Create and manage a VPC.
    • MySQL 8.0: fully compatible with MySQL 8.0. MySQL 8.0 supports the parallel query feature, which can improve the database performance by 10 times in specific scenarios. For more information, see Parallel query.
    • MySQL 5.7: fully compatible with MySQL 5.7.
    • MySQL 5.6: fully compatible with MySQL 5.6.
    • PostgreSQL 11: fully compatible with PostgreSQL 11.
    • Compatible with Oracle: highly compatible with Oracle. For more information, see Oracle compatibility.

    PostgreSQL 11 and Compatible with Oracle are not supported in the following regions: China (Qingdao), US (Virginia), UK (London), and Australia (Sydney).

    Edition By default, this parameter is set to Cluster (2 to 16 Nodes) (Recommended).
    Specification Type By default, this parameter is set to Dedicated Specification.
    Node Specification Select the specifications based on your business requirements. All nodes in the PolarDB cluster are dedicated nodes with stable and reliable performance.

    For more information about specifications of compute nodes, see Specifications and pricing.

    Nodes If the source cluster edition is Cluster (2 to 16 Nodes) (Recommended), the system creates a primary node and a read-only node that have the same specification by default. You do not need to configure this parameter.
    Note If the primary node fails, the system uses the read-only node as the primary node and creates another read-only node. For more information about read-only nodes, see Architecture.
    PolarProxy Type By default, this parameter is set to Dedicated Enterprise.
    Storage Cost The storage cost. You do not need to configure this parameter. The storage usage is billed on an hourly basis. For more information, see Specifications and pricing.
    Note You do not need to specify the storage capacity when you create a cluster. The system automatically scales storage resources based on data volume.
    Enable TDE Specifies whether to enable Transparent Data Encryption (TDE). When TDE is enabled, PolarDB encrypts the data files of your cluster. You do not need to modify the code to allow access to your cluster. However, TDE reduces the performance of your cluster by 5% to 10%.
    Note TDE cannot be disabled after it is enabled.
    Cluster Name The name of the cluster. The name must meet the following requirements:
    • It cannot start with http:// or https://.
    • It must be 1 to 256 characters in length.

    If you do not configure this parameter, the system automatically generates a cluster name. You can change the name after the cluster is created.

    Resource Group Select a resource group from the available resource groups. For more information, see Create a resource group.
    Note A resource group is a group of resources that belong to an Alibaba Cloud account. Resource groups allow you to manage these resources in a centralized manner. A resource belongs to only one resource group. For more information, see Use RAM to create and authorize resource groups.
  5. Specify the Number parameter and click Buy Now.
    Note You can create a maximum of 50 clusters at a time. This allows you to create multiple clusters in specific scenarios. For example, you can deploy multiple game servers at a time.
  6. On the Confirm Order page, confirm your order information. Read and accept the terms of service, and then click Buy Now.

    After you complete the payment, it requires 10 to 15 minutes to create the cluster. Then, the newly created cluster is displayed on the Clusters page.

    • If nodes in your cluster are in the Creating state, the cluster is being created and unavailable. The cluster is available only when it is in the Running state.
    • Make sure that you have selected the region where the cluster is deployed. Otherwise, you cannot view the cluster.
    • We recommend that you purchase PolarDB storage plans if you want to store a large volume of data. Storage plans are more cost-effective than pay-as-you-go storage. Larger storage plans provide more storage for lower costs. For more information, see .

What to do next

Configure a whitelist for a cluster

Related API operations

API Description
CreateDBCluster Creates a PolarDB cluster.
DescribeDBClusters Queries PolarDB clusters.
DescribeDBClusterAttribute Queries the information about a specified PolarDB cluster.