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    PolarDB:Purchase a pay-as-you-go cluster

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    PolarDB:Purchase a pay-as-you-go cluster

    Last Updated:Mar 27, 2024

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

    Prerequisites

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

    Precautions

    PolarDB for Oracle supports 64-bit DATE types that are compatible with Oracle. You must use the latest version of the PolarDB JDBC driver together with this feature. The JDBC driver must be 42.2.9.1.2 or later. Otherwise, loss of precision may occur. For more information, see 64-bit DATE types.

    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.

    Note

    • 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 a classic network, you must migrate the instance to a VPC.

    Step 1: Complete the basic settings

    In the Basic Settings step, you can configure the basic parameters and resources that are required to purchase a cluster. The basic parameters include Billing Method, Region, and Zone. The basic resources include the database engine, scaling range of resources, and storage. After you complete the basic settings, click Next: Cluster Configurations.

    1. Go to the PolarDB cluster buy page.

    2. Set Billing Method to Pay-As-You-Go.

      When you create a pay-as-you-go cluster, you do not need to make a payment first. You are charged for the computing, storage and proxies that you use.

    3. Configure the following parameters.

      Parameter

      Description

      Region

      The region of the cluster. After a cluster is created, the region of the cluster cannot be changed.

      Note

      • Make sure that the PolarDB cluster and the Elastic Compute Service (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.

      • You can deploy your PolarDB cluster and the ECS instance in the same zone or in different zones. If you create a PolarDB cluster in the same zone as the ECS instance, the network latency is reduced and the access speed is increased.

      Creation Method

      The method that is used to create a PolarDB cluster.

      • Create Primary Cluster: creates a new PolarDB cluster.

      • Restore from Recycle: creates a cluster by restoring a backup 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.

      Database Engine

      Set Database Engine to PolarDB for Oracle 1.0 or PolarDB for Oracle 2.0.

      Database Edition

      Enterprise Edition is selected by default.

      Edition

      Cluster Edition (Recommended) is selected by default.

      CPU Architecture

      X86 is selected by default.

      Nodes

      If the cluster edition is Cluster Edition (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.

      Primary Zone

      Select the primary zone where the cluster resides.

      • 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.

      Enable Hot Standby Cluster

      Select whether to Enable Hot Standby Cluster.

      • If the hot standby storage cluster feature is enabled, both the primary PolarDB cluster and the hot standby storage cluster are deployed in the same region. The two clusters each have three replicas, which adds up to six replicas. This delivers higher SLA than when this feature is disabled.

      • If this feature is disabled, only the primary cluster is deployed. The cluster has three replicas, and the storage unit price is half of that when this feature is enabled. This delivers lower SLA than when this feature is enabled.

      Specification

      Dedicated is selected by default.

      The compute node specifications.

      Note

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

      PolarProxy Type

      Dedicated Enterprise is selected by default.

      Storage Type

      PolarDB provides two storage types: PSL5 and PSL4.

      • PSL5: the storage type supported in the historical versions of PolarDB. It delivers higher performance, reliability and availability.

      • PSL4: a new storage type for PolarDB. PSL4 uses the Smart-SSD technology developed by Alibaba Cloud to compress and decompress data at the physical SSD disk level. This can minimize the storage price of data while keep a high disk performance.

      Note

      The storage type of existing clusters cannot be changed. To use PSL4, we recommend that you purchase a new cluster, set the storage type to PSL4, and then migrate data to the new cluster.

      For more information about the two storage types, see Comparison between PSL4 and PSL5.

      Storage Cost

      The storage cost. You do not need to change this parameter value. You are charged for the amount of storage capacity that is consumed by data 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 scales the storage capacity when the amount of data is increased or decreased.

    Step 2: Complete the cluster configurations

    In the Cluster Configurations step, set the configurations including cluster name and network type. After you complete the cluster configurations, click Next: Confirm Order.

    Configure the following parameters.

    Parameter

    Description

    Cluster Name

    You can specify a custom cluster name or use an Auto-generated name.

    If you select Auto-generate, the system automatically generates a cluster name after the cluster is created. You can modify the automatically generated cluster name.

    If you select Cluster Name, you must enter a cluster name. The name must meet the following requirements:

    • It cannot start with http:// or https://.

    • It must be 2 to 256 characters in length.

    • The name must start with a letter and can contain letters, digits, periods (.), underscores (_), and hyphens (-).

    Resource Group

    Select a resource group from the drop-down list. 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 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.

    Network type

    Configure the virtual private cloud (VPC) and vSwitch.

    The network type can only be VPC. You do not need to configure this parameter. Make sure that the PolarDB cluster is created in the same VPC as the ECS instance to which you want to connect. Otherwise, the cluster and the ECS instance cannot communicate over an internal network to achieve optimal performance.

    • If an existing VPC meets your network requirements, select the VPC. For example, if you have an existing ECS instance and the VPC to which the ECS instance belongs 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 CIDR block of the default VPC uses a 16-bit subnet mask. For example, the CIDR block of the default VPC can be 192.168.0.0/16. This CIDR block provides up to 65,536 private IP addresses.

        • The default VPC does not count towards the quota of 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 CIDR block of the default vSwitch uses a 20-bit subnet mask. For example, the CIDR block of the default vSwitch can be 192.168.0.0/20. This CIDR block provides up to 4,096 private IP addresses.

        • The default vSwitch does not count towards the quota of vSwitches that you can create in a VPC.

    • If the default VPC and vSwitch cannot meet your requirements, you can create your own VPC and vSwitch. For more information, see Create and manage a VPC.

    Enable TDE

    Specify 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

    You cannot disable TDE after TDE is enabled.

    Step 3: Confirm the order

    Before the cluster is created, make sure that the selected configurations such as the quantity meet your requirements.

    1. Check the configurations.

      To modify the settings in a step, clickedit.

    2. Specify Quantity.

      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.

      • You can purchase up to 50 clusters with your Alibaba Cloud account.

    3. Read and select the terms of service.

    4. View the fee and details in the lower part of the page. If they are correct, click Buy Now.

    5. On the Purchase page, confirm the order and the payment method, and click Purchase.

      After you complete the payment, wait 10 to 15 minutes to view the new cluster on the Clusters page.

      Note

      • If specific nodes in the cluster are in the Creating state, the cluster is still being created and is unavailable. The cluster is available only when the cluster is in the Running state.

      • Make sure that you select the region where the cluster is deployed. Otherwise, you cannot view the cluster.

    Related API operations

    API

    Description

    CreateDBCluster

    Creates a PolarDB cluster.

    DescribeDBClusters

    Queries PolarDB clusters.

    DescribeDBClusterAttribute

    Queries details about a PolarDB cluster.