Updated at: 2022-05-07 GMT+08:00

Step 1: Buy a DB Instance


This section describes how to create a DB instance on the RDS console.

Currently, RDS for SQL Server supports the yearly/monthly and pay-per-use billing modes. The DB instance class and storage space you need depend on your processing power and memory requirements.


  • You have registered a HUAWEI CLOUD account.


  1. Log in to the management console.
  2. Click in the upper left corner and select a region and a project.
  3. Click in the upper left corner of the page and choose Database > Relational Database Service. The RDS console is displayed.
  4. On the Instance Management page, click Buy DB Instance.
  5. On the displayed page, select a billing mode and configure information about your DB instance. Then, click Next.

    RDS provides the following billing modes:


    If you select this billing mode, skip 6 and go to 7.


    If you select this billing mode, go to 6.

    Table 1 Basic information




    Region where the tenant is located.


    Products in different regions cannot communicate with each other through a private network and you cannot change the region of a DB instance after creating the instance. Therefore, exercise caution when selecting a region.

    DB Instance Name

    Must start with a letter and consist of 4 to 64 bytes. Only letters (case-sensitive), digits, hyphens (-), and underscores (_) are allowed.

    • If you intend to create multiple DB instances and read replicas, the allowed length for each instance name will change.
    • If you buy multiple DB instances at a time, they will be named instance-0001, instance-0002, and so on. (instance indicates the DB instance name you specify.)

    DB Engine

    Set to Microsoft SQL Server.

    DB Engine Version

    For details, see DB Engines and Versions.

    Different DB engine versions are supported in different regions.

    You are advised to select the latest available version because it is more stable, reliable, and secure.

    DB Instance Type

    • Primary/Standby: uses an HA architecture with a primary DB instance and a synchronous standby DB instance. It is suitable for production databases of large- and medium-sized enterprises in Internet, Internet of Things (IoT), retail e-commerce sales, logistics, gaming, and other sectors. The standby DB instance improves instance reliability and is invisible to you after being created.

      An AZ is a physical region where resources use independent power supply and networks. AZs are physically isolated but interconnected through an internal network. Some regions support both single AZs and multiple AZs and some only support single AZs.

      To achieve higher reliability, RDS will automatically deploy your primary and standby instances in different physical servers even if you deploy primary/standby DB instances in the same AZ. If you attempt to create primary/standby DB instances in the same AZ in a Dedicated Computing Cluster (DCC) and there is only one physical server available, the creation will fail.

      You can deploy primary and standby DB instances in a single AZ or across AZs to achieve failover and high availability.

    • Single: uses a single-node architecture, which is more cost-effective than primary/standby DB instances. It is suitable for development and testing of microsites, and small- and medium-sized enterprises, or for learning about RDS.

    Storage Type

    Determines the DB instance read/write speed. The higher the maximum throughput is, the higher the DB instance read/write speed can be.

    • Ultra-high I/O: supports a maximum throughput of 350 MB/s.

    If you have purchased the Dedicated Distributed Storage Service (DSS), only the storage type that you have selected when you buy the DSS service is displayed.

    Time Zone

    Select your time zone when you are creating a DB instance. After the DB instance is created, the time zone cannot be modified. For details, see Table 2.

    Server Collation

    Defines a collation of a database or table column, or a collation cast operation when applied to character string expression. It acts as the default collation for the DB instance.

    Table 2 Mapping between time zones and UTC offsets

    Time Zone

    Standard Time Offset


    Afghanistan Standard Time



    Alaskan Standard Time



    Arabian Standard Time


    Abu Dhabi, Muscat

    Atlantic Standard Time


    Atlantic Time (Canada)

    AUS Central Standard Time



    AUS Eastern Standard Time


    Canberra, Melbourne, Sydney

    Belarus Standard Time



    Canada Central Standard Time



    Cape Verde Standard Time


    Cape Verde Is.

    Cen. Australia Standard Time



    Central America Standard Time


    Central America

    Central Asia Standard Time



    Central Brazilian Standard Time



    Central European Standard Time


    Belgrade, Bratislava, Budapest, Ljubljana, Prague

    Central European Standard Time


    Sarajevo, Skopje, Warsaw, Zagreb

    Central Pacific Standard Time


    Solomon Islands, New Caledonia

    Central Standard Time


    Central Time (US and Canada)

    China Standard Time


    Beijing, Chongqing, Hong Kong, and Urumqi

    E. Africa Standard Time



    E. Australia Standard Time



    E. Europe Standard Time



    E. South America Standard Time



    Eastern Standard Time


    Eastern Time (US and Canada)

    Georgian Standard Time



    GMT Standard Time


    Dublin, Edinburgh, Lisbon, London

    Greenland Standard Time



    Greenwich Standard Time


    Monrovia, Reykjavik

    GTB Standard Time


    Athens, Bucharest

    Hawaiian Standard Time



    India Standard Time


    Chennai, Kolkata, Mumbai, New Delhi

    Jordan Standard Time



    Korea Standard Time



    Middle East Standard Time



    Mountain Standard Time


    Mountain Time (US and Canada)

    US Mountain Standard Time



    New Zealand Standard Time


    Auckland, Wellington

    Newfoundland Standard Time



    Pacific SA Standard Time



    Pacific Standard Time


    Pacific Time (US and Canada)

    Russian Standard Time


    Moscow/St. Petersburg

    SA Pacific Standard Time


    Bogota, Lima, Quito, Rio Branco

    SE Asia Standard Time


    Bangkok, Hanoi, Jakarta

    China Standard Time


    Kuala Lumpur, Singapore

    Tokyo Standard Time


    Osaka, Sapporo, Tokyo

    US Eastern Standard Time


    Indiana (East)



    Coordinated Universal Time



    Coordinated Universal Time–02



    Coordinated Universal Time–08



    Coordinated Universal Time–09



    Coordinated Universal Time–11



    Coordinated Universal Time+12

    W. Australia Standard Time



    W. Central Africa Standard Time


    West Central Africa

    W. Europe Standard Time


    Amsterdam, Berlin, Bern, Rome, Stockholm, Vienna

    Table 3 Instance specifications



    Instance Class

    Refers to the CPU and memory of a DB instance. Different instance classes have different numbers of database connections and different maximum IOPS.

    After a DB instance is created, you can change its CPU and memory. For details, see Changing a DB Instance Class.


    DB instances in a DCC only support the general-enhanced instance class.

    Resource Type

    • EVS
    • DSS

      This option is displayed only when you buy the DSS service.

    Storage Pool

    Displayed only when you select DSS for Resource Type. The storage pool is secure because it is physically isolated from other pools.

    Storage Space (GB)

    Contains the file system overhead required for inode, reserved block, and database operation. Storage space can range in size from 40 GB to 4,000 GB and can be scaled up only by a multiple of 10 GB.

    After a DB instance is created, you can scale up its storage space. For details, see Scaling up Storage Space.

    Disk Encryption

    • Disable: indicates the encryption function is disabled.
    • Enable: indicates the encryption function is enabled, improving data security but affecting system performance.

      Key Name: indicates the tenant key. You can create or select a key.

      • Once the DB instance is created, you cannot modify the disk encryption status or change the key. The backup data stored in OBS is not encrypted.
      • After an RDS DB instance is created, do not disable or delete the key that is being used. Otherwise, RDS will be unavailable and data cannot be restored.
      • For details about how to create a key, see Creating a CMK in the Data Encryption Workshop User Guide.
    Table 4 Network




    A dedicated virtual network in which your RDS DB instances are located. A VPC can isolate networks for different services. You can select an existing VPC or create a VPC. For details on how to create a VPC, see the "Creating a VPC" section in the Virtual Private Cloud User Guide.

    If no VPC is available, RDS allocates a VPC to you by default.


    After the DB instance is created, the VPC cannot be changed.


    Improves network security by providing dedicated network resources that are logically isolated from other networks. Subnets take effect only within an AZ. The Dynamic Host Configuration Protocol (DHCP) function is enabled by default for subnets in which you plan to create RDS DB instances and cannot be disabled.

    A floating IP address is automatically assigned when you create a DB instance. You can also enter an unused floating IP address in the subnet CIDR block. After the DB instance is created, you can change the floating IP address.

    Security Group

    Enhances security by controlling access to RDS from other services. You need to add inbound rules to a security group so that you can connect to your DB instance.

    If no security group is available, RDS allocates a security group to you by default.


    To configure the Active Directory (AD) domain for the DB instance, ensure that the DB instance and domain controller must be in the same security group.

    Table 5 Database configuration




    • Configure (default setting): Configure a password for your DB instance during the creation process.
    • Skip: Configure a password later after the DB instance is created.

      To log in, you will have to reset a password for the DB instance.

      After a DB instance is created, you can reset the password. For details, see Resetting the Administrator Password.


    The default login name for the database is rdsuser.

    Administrator Password

    Must consist of 8 to 32 characters and contain at least three types of the following characters: uppercase letters, lowercase letters, digits, and special characters (~!@#$%^*-_+?,). Enter a strong password and periodically change it for security reasons.

    Keep this password secure. The system cannot retrieve it.

    After a DB instance is created, you can reset this password. For details, see Resetting the Administrator Password.

    Confirm Password

    Must be the same as Administrator Password.

    Parameter Template

    Contains engine configuration values that can be applied to one or more DB instances. If you intend to create primary/standby DB instances, they use the same parameter template.


    If you use a custom parameter template when creating a DB instance, the specification-related parameter max server memory (MB) in the custom template is not delivered. Instead, the default value is used.

    You can modify the instance parameters as required after the DB instance is created. For details, see section Modifying Parameters in a Parameter Template.

    Enterprise Project

    If your account has been associated with an enterprise project, select the target project from the Enterprise Project drop-down list.

    You can also go to the ProjectMan console to create a project. For details about how to create a project, see the ProjectMan User Guide.

    Table 6 AD domain



    AD Domain

    Allows an Active Directory user to authenticate with RDS for SQL Server DB instances.

    Active Directory (AD) is a directory service on Windows Standard Server, Windows Enterprise Server, and Windows Datacenter Server. Active Directory stores information about objects on the network and makes this information easy for administrators and users to find and use. Active Directory uses a structured data store as the basis for a logical, hierarchical organization of directory information.

    1. To use AD domain, contact customer service to apply for the required permissions.
    2. When you configure AD domain information during the DB instance creation, do not configure or disable Group Policy Object (GPO) for your domain controller server. Otherwise, the DB instance creation will fail.
    3. If GPO is required, you need to buy an ECS and set up a new domain controller server with GPO disabled. Then, establish trust between your domain controller server and the new domain controller server. For details, contact customer service.
    4. The domain controller server time must be synchronized to an NTP server. Non-standard time or too large time difference may cause DB instance creation failures.
    • Skip: This option is selected by default.
    • Configure: To configure the AD domain, you must first prepare a domain controller on an ECS or on-premises database. Then, configure the directory address, domain name, directory administrator, and directory administrator password as required.

    If a single RDS for SQL Server instance is configured with the AD domain, it cannot be changed to primary/standby DB instances.

    Directory Address

    Enter the private IP address of the ECS that supports the AD domain. After the DB instance is created, you can view the directory address in the DB Information area on the Basic Information page.

    Example value: 192.168.x.x.

    Domain Name

    A fully qualified domain name, such as DBStest.com, must:

    1. Be the same as the ECS domain name.
    2. Be no more than 48 characters long.
    3. Only include letters, digits, dots (.), and hyphens (-).
    4. Include a valid top-level domain name which contains at least 2 characters long and contains only dots (.) and letters, for example, .com
    5. After the DB instance is created, you can view the directory address in the DB Information area on the Basic Information page.

    Directory Administrator

    You are advised to set this parameter to the domain administrator which belongs to the Domain Admins group (because high permissions are required for a client to add a domain).

    Directory Administrator Password

    Indicates the password of the directory administrator.

    Keep this password secure. The system cannot retrieve it.

    Table 7 Tags




    Tags an RDS DB instance. This configuration is optional. Adding tags to RDS DB instances helps you better identify and manage the DB instances. A maximum of 10 tags can be added for each DB instance.

    After a DB instance is created, you can view its tag details on the Tags page. For details, see Managing Tags.

    Table 8 Purchase period



    Required Duration

    This option is available only for yearly/monthly DB instances. The system will automatically calculate the configuration fee based on the selected required duration. The longer the required duration is, the larger discount you will enjoy.


    • This option is available only for yearly/monthly DB instances and is not selected by default.
    • If you select this option, the auto-renew cycle is determined by the selected required duration.


    RDS supports batch creation of DB instances. If you intend to create primary/standby DB instances and set Quantity to 1, a primary DB instance and a synchronous standby DB instance will be created.

    If you have any questions about the price, click Pricing details at the bottom of the page.

    The performance of your DB instance depends on its configurations. Hardware configuration items include the instance specifications, storage type, and storage space.

  6. Confirm the specifications for pay-per-use DB instances.

    • If you need to modify your settings, click Previous.
    • If you do not need to modify your settings, click Submit.

    Skip 7 and 8 and go to 9.

  7. Confirm the order for yearly/monthly DB instances.

    • If you need to modify your settings, click Previous.
    • Otherwise, click Pay Now.

  8. Select a payment method and complete the payment.

    This operation applies only to the yearly/monthly billing mode.

  9. To view and manage the DB instance, go to the Instance Management page.

    • During the creation process, the DB instance status is Creating. When the creation process is complete, the instance status will change to Available.
    • The automated backup policy is enabled by default. An automated full backup is immediately triggered after a DB instance is created.
    • After a DB instance is created, you can enter a description for it.
    • The default database port number is 1433. After a DB instance is created, you can change its port number.

      You are advised to change the database port in a timely manner.

      For details, see Changing a Database Port.