Region |
The region where you want to create a cluster. You cannot change the region after
the cluster is created.
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 results
in decreased cluster performance.
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Create Type |
The type of cluster to be created. Select Create Secondary Cluster.
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GDN |
The GDN in which you want to create a secondary cluster.
Note By default, the GDN that you select before you create the secondary cluster is used.
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Primary Availability Zone |
The primary zone where the cluster is deployed.
- A zone is an independent geographical location in a region. All of the 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.
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Network Type |
This parameter can be set only to VPC. You do not need to change this parameter value.
Note Before you use the classic network, you must select a virtual private cloud (VPC).
After the cluster is created, configure the classic network. For more information,
see Cluster endpoints and primary endpoints.
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VPC VSwitch
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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
results in decreased cluster performance.
- If you have an existing VPC that 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 172.31.0.0/16
provides up to 65,536 internal 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 172.16.0.0/20
provides up to 4,096 internal 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.
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Compatibility |
MySQL 8.0, MySQL 5.7, and MySQL 5.6 are supported. The value of this parameter must be specified the same as the compatibility
of the primary cluster.
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Edition |
This parameter can only be set to Cluster (2-16 Nodes) (Recommended). You do not need to change this parameter value.
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Node Specification |
Specify the node specification based on your business requirements. For more information,
see Specifications of compute nodes.
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Nodes |
By default, each Cluster (2-16 Nodes) (Recommended) cluster consists of one primary node and one read-only node. Both of the nodes have
the same specifications. Keep the default setting.
Note If the primary node fails, the system upgrades the read-only node to a primary node
and creates another read-only node. For more information about read-only nodes, see
Architecture.
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Storage Cost |
The storage cost. You do not need to change this parameter value. You are charged
by hour for the actual volume of storage space that is consumed. For more information,
see Billable items.
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.
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Time Zone |
The time zone of the cluster. The default value is UTC+08:00.
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Table Name Case Sensitivity |
Specifies whether table names are case-sensitive. The default value is Not Case-sensitive. If the table names of your on-premises database are case-sensitive, we recommend
that you select Case-sensitive. This ensures that data is migrated smoothly.
Note After the cluster is created, you cannot change the value of this parameter. We recommend
that you configure this parameter based on your business requirements.
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Release Cluster |
The backup retention policy that is used when the cluster is deleted or released.
The default value is Retain Last Automatic Backup (Automatic Backup before Release) (Default).
- Retain Last Automatic Backup (Automatic Backup before Release) (Default): The system retains the last backup when you release the cluster.
- Retain All Backups: The system retains all backups when you release the cluster.
- Delete All Backups (Cannot be restored): The system retains no backups when you release the cluster.
Note You may be charged for the backups that are retained after you delete or release a
cluster. For more information, see Release a cluster.
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Cluster Name |
- The name of the new cluster. It must be 2 to 128 characters in length and can contain
letters, digits, periods (.), underscores (_), and hyphens (-). It must start with
a letter.
- If you leave this parameter empty, the system generates a cluster name. You can change
the cluster name after the cluster is created.
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Resource Group |
Select a resource group from 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.
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