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Managing Read-Only Instance

Last updated: 2024-11-12 17:23:58
    You can create, view, and terminate read-only instances in the TencentDB for SQL Server console.
    Note:
    Single-node (cloud disk) instances do not support the addition of read-only instances.
    Read-only instances cannot be purchased and used separately. They should be bound to a primary instance (Two-Node Edition, formerly High-Availability Edition/Cluster Edition) for use.
    An RO group containing only 1 read-only instance has a risk of single point of failure, and this RO group will not be included in the overall availability calculation for the TencentDB for SQL Server. A single read-only instance does not provide availability SLA guarantees. It is recommended to purchase at least 2 read-only instances for an RO group to ensure its availability.

    Regions Supported by Read-Only Instances

    China
    Asia Pacific
    Europe and Americas
    Region
    Availability Zone
    Cloud Disk Edition RO
    Local Disk RO
    Guangzhou
    ap-guangzhou
    Guangzhou Zone 3
    ap-guangzhou-3
    ×
    Guangzhou Zone 6
    ap-guangzhou-6
    ×
    Guangzhou Zone 7
    ap-guangzhou-7
    ×
    Shanghai
    ap-shanghai
    Shanghai Zone 2
    ap-shanghai-2
    Shanghai Zone 3
    ap-shanghai-3
    ×
    Shanghai Zone 4
    ap-shanghai-4
    Shanghai Zone 5
    ap-shanghai-4
    ×
    Nanjing
    ap-nanjing
    Nanjing Zone 1
    ap-nanjing-1
    Nanjing Zone 2
    ap-nanjing-2
    Beijing
    ap-beijing
    Beijing Zone 1
    ap-beijing-1
    ×
    Beijing Zone 2
    ap-beijing-2
    ×
    Beijing Zone 3
    ap-beijing-3
    Beijing Zone 4
    ap-beijing-4
    ×
    ×
    Beijing Zone 5
    ap-beijing-5
    ×
    Beijing Zone 6
    ap-beijing-6
    ×
    Beijing Zone 7
    ap-beijing-7
    ×
    Chengdu
    ap-chengdu
    Chengdu Zone 1
    ap-chengdu-1
    ×
    Chengdu Zone 2
    ap-chengdu-2
    ×
    Chongqing
    ap-chongqing
    Chongqing Zone 1
    ap-chongqing-1
    ×
    Hong Kong (China)
    ap-hongkong
    Hong Kong (China) Zone 1
    ap-hongkong-1
    ×
    Hong Kong (China) Zone 2
    ap-hongkong-2
    Hong Kong (China) Zone 3
    ap-hongkong-3
    ×
    Region
    Availability Zone
    Cloud Disk Edition RO
    Local Disk RO
    Singapore
    ap-singapore
    Singapore Zone 1
    ap-singapore-1
    ×
    ×
    Singapore Zone 2
    ap-singapore-2
    ×
    ×
    Singapore Zone 3
    ap-singapore-3
    ×
    Singapore Zone 4
    ap-singapore-4
    ×
    Jakarta
    ap-jakarta
    Jakarta Zone 1
    ap-jakarta-1
    ×
    Jakarta Zone 2
    ap-jakarta-2
    ×
    Bangkok
    ap-bangkok
    Bangkok Zone 1
    ap-bangkok-1
    ×
    Bangkok Zone 2
    ap-bangkok-2
    ×
    Seoul
    ap-seoul
    Seoul Zone 1
    ap-seoul-1
    ×
    Seoul Zone 2
    ap-seoul-2
    ×
    Tokyo
    ap-tokyo
    Tokyo Zone 1
    ap-tokyo-1
    ×
    Tokyo Zone 2
    ap-tokyo-2
    ×
    Region
    Availability Zone
    Cloud Disk Edition RO
    Local Disk RO
    Virginia
    na-ashburn
    Virginia Zone 1
    na-ashburn-1
    ×
    Virginia Zone 2
    na-ashburn-2
    ×
    Frankfurt
    eu-frankfurt
    Frankfurt Zone 1
    eu-frankfurt-1
    ×
    Frankfurt Zone 2
    eu-frankfurt-2
    ×
    Silicon Valley
    na-siliconvalley
    Silicon Valley Zone 1
    na-siliconvalley-1
    ×
    Silicon Valley Zone 2
    na-siliconvalley-2
    ×
    Sao Paulo
    sa-saopaulo
    São Paulo Zone 1
    sa-saopaulo-1
    ×

    Read-Only Instance Details Page

    The Instance Details page of read-only instances is shown below:
    
    Feature Area
    Illustration
    Feature
    Description
    Topology diagram (architecture diagram)
    
    Read-only group address
    You can hover the mouse over the read-only group address in the topology diagram to quickly view the read-only group address and configure the read-only group. For details, see Read-Only Group.
    
    Read-only instance
    You can hover the mouse over the read-only instance in the topology diagram to quickly view the private network address and public network address of the read-only instance. Click the + icon on the read-only instance in the topology diagram to create a read-only instance.
    
    Read-only instance storage
    You can hover the mouse over the read-only instance storage in the topology diagram to view the usage of the read-only instance storage space. Click Scale-out to enter the configuration adjustment page for setup.
    
    
    
    Topology diagram view scale
    You can adjust the display scale of the topology diagram.
    -
    Gray area in the topology diagram
    The gray area in the topology diagram indicates the deployment architecture of the primary instance to which this read-only instance belongs. Click operations are not supported in the gray area.
    Instance information (on the right side)
    
    Hiding/Showing instance information
    You can hide or show the instance information section.
    
    Current Read-Only Instance
    Under the current read-only instance on the right side, you can view the read-only instance information such as private network address, public network address, network, instance status, availability zone, edition, architecture, configuration, and weight.
    
    View the details of the associated primary instance
    After viewing the details of the associated primary instance on the right side, you can click the primary instance ID to enter the details page of the primary instance to which this read-only instance belongs.

    Creating Read-Only Instances

    1. Log in to the TencentDB for SQL Server console. In the instance list, click the Instance ID or Manage in the Operation column to enter the details page.
    2. On the Instance Details page, click the + icon in the read-only instance area of the topology diagram, or select the Read-Only Instance tab and click Create to enter the purchase page.
    
    3. On the purchase page, select the corresponding configurations for the read-only instance. After confirming no errors, click Buy Now to purchase the read-only instance.
    Note:
    If you need to align the expiration date of the read-only instance with that of the primary instance, you can set a unified expiration date in the Renewal Management console. For detailed operation steps, see Unified Expiration Date.

    Viewing Read-Only Instance

    1. Log in to the TencentDB for SQL Server console. In the instance list, instances with an R flag are read-only instances. Click an instance ID or Manage in the Operation column to enter the read-only instance details page.
    2. In the instance information on the right side of the Instance Details page, you can view the bound primary instance. Click the Instance ID to enter the details page of the primary instance. You can also enter the details page of the read-only instance from the topology diagram of the primary instance.
    Note:
    Some features on the Instance Details page of the read-only instance are consistent with the configurations of the primary instance and cannot be modified. If necessary, you can modify them on the Instance Details page of the primary instance.
    

    Terminating Read-Only Instance

    An read-only instance can be terminated in the same way as a primary instance as instructed in Terminating Instance.
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