Prerequisites
Official Website Purchase
1. Log in to the TencentDB for SQL Server purchase page. Complete the following steps in order: Select a basic configuration, Set network and database, and Confirm the configuration info. Read and agree to the service terms. After verifying that everything is correct, click Buy Now. Step 1. Select a basic configuration
In this step, you can configure the basic and specification settings for the instance. The specific configurable items are as follows:
Basic Configuration
Billing Mode: yearly/monthly subscription and pay-as-you-go.
Region: Select the region for instance deployment. To reduce access latency and improve download speed, we recommend that you choose the region closest to your customers.
AZ: Select an AZ within the selected region.
Instance Architecture: Support single-node, two-node, and multi-node.
Storage Type:
When the single-node architecture is selected, you can choose from the following storage types: High-Performance Cloud Disk, SSD Cloud Disk, Balanced SSD Cloud Disk, and Enhanced SSD Cloud Disk.
Note:
For single-node instances in Mainland China regions that require SSD CBS, please submit a ticket to apply. When the two-node architecture is selected, the storage type supports Enhanced SSD, Balanced SSD, and High-Performance Local SSD.
When the multi-node architecture is selected, the storage type supports Enhanced SSD and Balanced SSD.
For details of each storage type and use cases, see Storage Types. Database Versions: SQL Server 2012, SQL Server 2014, SQL Server 2016, SQL Server 2017, SQL Server 2019 Enterprise/Standard, SQL Server 2022 Enterprise, and SQL Server 2025 Enterprise are supported. For the database versions supported by different instance architectures, refer to the purchase page.
Disk Encryption: For instances in the Shanghai region with CBS as the storage type and SQL Server 2019/2022/2025 Enterprise as the database version, the disk encryption feature can be used after applying for whitelisting. Disk encryption is not currently supported in other regions or for other versions. To request support, please submit a ticket. The Disk Encryption field is displayed only after the disk encryption feature is applied for. Key Source: This item is displayed when disk encryption is enabled. Currently, the default key source is provided by Tencent Cloud.
Number of Replica Nodes: If the multi-node architecture is selected, you need to specify the number of replica nodes with the number range from 2 to 5. The settings are not required for single-node or two-node architecture.
Multi-AZ Deployment: This option is available when a two-node or multi-node architecture is selected. For multi-node architecture, it can only be set to enabled.
Yes: Multi-AZ deployment is enabled, requiring the selection of secondary AZs in the next step. Each secondary node can be assigned a secondary AZ. Note: If all secondary nodes are deployed in the same AZ, the AZ-level disaster recovery is not supported. Please choose different secondary AZs.
No: Multi-AZ deployment is not enabled. Currently, only Shanghai, Beijing, Guangzhou, and Hong Kong (China) support multi-AZ deployment. Multi-AZ is a physical zone that combines multiple single AZs in the same region, which is used to protect databases in case of instance faults or AZ interruptions.
Replica AZ: If multi-AZ deployment is enabled, select the secondary AZs based on the available resources.
Specs Configuration
Type: Dedicated.
Filter: Quickly filter the CPU and memory of the required instances. All CPUs and all memory are selected by default.
Selected instances: Displays the specifications of the selected instances, including the specification type and details.
Instance specifications: Displays the instance's specification type, CPU, memory, supported AZs, and specification reference fees.
Disk: Select the required disk capacity.
Additional performance: Additional I/O performance can be configured on top of the baseline disk performance to meet the demands of high-throughput, high-IOPS business scenarios. To configure additional performance, the following prerequisites must be met: the instance must be a single-node, dual-node, or multi-node Cloud Disk Edition architecture, the storage type must be Enhanced SSD CBS, and the disk capacity must be greater than or equal to 460 GB. You can also configure it after creating the instance. For details, see Configure Additional Disk I/O Performance. Note:
Baseline disk performance is automatically provisioned based on disk capacity and incurs no additional charges. Additional I/O performance is an optional enhancement and will be billed separately. For details, see Additional Disk I/O Performance Billing. Step 2. Set network and database
Network: Supports VPC. For connectivity testing, see Network Environment. Both VPC networks and subnets support fuzzy search. Note:
It is recommended that the CVM and the cloud database reside under the same account and within the same VPC (to ensure they are in the same region, with no restriction on AZs).
A subnet is a network space within a VPC and is a logical concept. You can create subnets in different AZs under the same VPC. Subnets in different AZs under the same VPC can communicate over the private network by default. Even if you select a subnet in another AZ within the same region, the actual service connection follows a proximity-based logic and does not increase network latency.
Security group: A stateful virtual firewall with filtering capabilities, used to configure network access control for single or multiple cloud databases. It is an important network security isolation mechanism provided by Tencent Cloud.
Note:
It supports creating new security groups or selecting existing ones, and it also supports multi-selection and fuzzy search.
Instance Name: You can name the instance immediately or after creation.
System Time Zone: China Standard Time (Beijing Time) is supported by default.
If you purchase a two-node local disk instance, you must first submit a ticket to apply for system time zone modifications. If you purchase a single-node cloud disk, a two-node cloud disk, or a multi-node cloud disk instance, you can directly modify the system time zone on the purchase page with no need for an application.
Character Set Collation: The instance character set provides collation rules for system data, which define case-sensitivity and accent-sensitivity attributes. Chinese_PRC_CI_AS is supported by default.
If you purchase a two-node local disk instance, you must first submit a ticket to apply for character set collation modifications. If you purchase a single-node cloud disk, a two-node cloud disk, or a multi-node cloud disk instance, you can directly modify the system time zone on the purchase page with no need for an application.
Transmission Mode: Configure the transmission mode between the primary and standby databases of the instance. This setting is supported only for two-node Cloud Disk Edition architecture instances of SQL Server 2017, SQL Server 2019, SQL Server 2022, and SQL Server 2025 Enterprise. Options include: Async (availability precedence) and Sync (reliability precedence). The default value is Async (availability precedence).
Asynchronous (availability-first): This is a high-performance mode that prioritizes availability. It is recommended for systems with high uptime requirements. During a switch between primary and secondary, it strives to prioritize database availability, though the actual outcome depends on the specific failure scenario and the switch result.
Synchronous (reliability-first): This is a high-reliability mode that prioritizes reliability. It is recommended for systems with high data consistency requirements. During a switch between primary and secondary, it strives to prioritize data consistency, though the actual outcome depends on the specific failure scenario and the switch result.
Project: TencentDB for SQL Server supports assigning instances to different projects for management. It also supports fuzzy search of project names for faster project selection.
Tag: It facilitates the categorized management of instance resources. It also supports adding multiple tags.
Maintenance window and Maintenance Time: To ensure the stability of TencentDB for SQL Server instances, the backend system performs maintenance operations on instances irregularly within the maintenance window. It is recommended that you configure an acceptable maintenance time for your business instances, typically during off-peak hours, to minimize the impact on your business. Up to 7 maintenance cycles can be selected.
Step 3: Confirm Configuration Information
The configuration details of instances from step one and step two are displayed. If modifications are needed, click Edit. After confirming all settings, enable auto-renewal, read and select the service terms, and click Buy Now.
Auto-renewal (for monthly subscription billing mode): If auto-renewal is enabled and the account balance is sufficient, the instance will be automatically renewed upon expiration based on the selected purchase duration: monthly or annually.
Purchase duration of 1 to 11 months: The auto-renewal period is one month, and the instance will be automatically renewed on a monthly basis upon expiration.
Purchase duration of 1 to 5 years: The auto-renewal period is one year, and the instance will be automatically renewed on a yearly basis upon expiration, with an auto-renewal discount applied.
resource inspection: The system performs a resource pre-check to determine whether the selected specification configuration has sufficient resources. If resources are sufficient, the check passes, and you can proceed to the next step. If resources are insufficient, change the configuration and perform the resource pre-check again. You can proceed to the next step only after the pre-check passes.
2. After the purchase is completed, return to the Instance List and view the created instance. Once the status changes to Running, the instance is created successfully. Related APIs
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| This API is used to create a highly available instance (local disk). |
| This API is used to create a Basic Edition instance (cloud disk). |
| This API is used to create a highly available instance (cloud disk). |
| This API (DescribeRegions) is used to query region information for sale. |
| This API (DescribeZones) is used to query currently available AZ information for sale. |
| This API (DescribeProductConfig) is used to query product configuration for sale. |
| This API (DescribeSpecSellStatus) is used to query the status information of specifications for sale, including the sales status and reference price. (The actual price is subject to the result returned by price querying APIs.) |
| This API (InquiryPriceCreateDBInstances) is used to query the price for applying for an instance. |
| This API (DescribeOrders) is used to query order information. |
| This API (DescribeInstanceByOrders) is used to query the resource ID based on the order number. |