PolarDB:Purchase a subscription cluster

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.

Usage notes

PolarDB for PostgreSQL (Compatible with 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 of 42.2.9.1.2 or later. Otherwise, the 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.

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 Subscription.

   When you create a subscription cluster, you must pay upfront fees for computing, storage, and proxy resources.

3. Configure the parameters described in the following table.

   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 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: Create a PolarDB cluster. Restore from Recycle Bin: Create 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 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 specifications by default. You do not need to configure this parameter.
   Primary Zone	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	Specifies whether to enable Hot standby storage cluster. If the hot standby storage cluster feature is enabled, both the primary 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 types 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 keeping 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 the data of an existing cluster to the new cluster. For more information about the two storage types, see Comparison between PSL4 and PSL5.
   Storage Billing Method	PolarDB supports the Pay-as-you-go and Subscription storage billing methods. Pay-as-you-go: The storage capacity is provided based on a serverless architecture. This way, you do not need to specify the storage capacity when you purchase clusters. The storage capacity of the clusters can be automatically scaled up as the volume of data increases. You are charged for the amount of storage capacity that is consumed by data. Subscription: You must purchase a specific amount of storage capacity for a cluster when you create the cluster. For more information about the two storage billing methods, see Overview.
   Storage Capacity	The amount of storage capacity that you want to purchase for your cluster. The storage capacity ranges from 50 GB to 100 TB, in 10 GB increments. Note This parameter is available only when Storage Billing Method is set to Subscription.
   Storage Cost	The storage cost. You do not need to configure this parameter. 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 automatically scales storage resources based on data volume. This parameter is available only when Storage Billing Method is set to Pay-as-you-go.

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 parameters described in the following table.

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 selected configurations.

   To modify the settings in a step, click .

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. Then, you can 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.

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