Step 2: Buy a DB Instance

Scenarios

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

RDS for MariaDB only supports the pay-per-use billing mode. RDS allows you to tailor your compute resources and storage space to your business needs.

Prerequisites

Your account balance is greater than or equal to $0 USD.

Procedure

1. Go to the Buy DB Instance page.
2. On that page, select a billing mode, configure information about your DB instance, and click Next.
   • Basic information
     Figure 1 Basic information
     

     Table 1 Basic information

     Parameter	Description
     Billing Mode	Select Pay-per-use.
     Region	Region where your resources are located. NOTE: Products in different regions cannot communicate with each other through a private network. After a DB instance is created, the region cannot be changed. Therefore, exercise caution when selecting a region.
     Project	The project corresponds to the region. Different regions correspond to different projects.
     DB Instance Name	Must start with a letter and consist of 4 to 64 characters. Only letters (case-sensitive), digits, hyphens (-), and underscores (_) are allowed. If you intend to buy multiple DB instances at a time, 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	MariaDB
     DB Engine Version	For details, see DB Engines and Versions. The DB engine version differs in different regions.
     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. Single: uses a single-node architecture, which is more cost-effective than primary/standby DB instances. It is only recommended for development and testing of microsites, and small and medium enterprises, or for learning about RDS.
     AZ	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-AZ and multi-AZ deployment and some only support single-AZ deployment. To achieve high reliability, RDS will automatically deploy your primary and standby instances in different physical servers even if you deploy them in the same AZ. You can deploy primary and standby instances in a single AZ or across AZs to achieve failover and high availability.
     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. Cloud SSD: cloud drives used to decouple storage from compute. The maximum throughput is 350 MB/s. Extreme SSD: uses 25GE network and RDMA technologies to provide you with up to 1,000 MB/s throughput per disk and sub-millisecond latency.
     Time Zone	You need to select a time zone for your instance based on the region hosting your instance. You can select a time zone during instance creation and change it later as needed.

   • Specifications and storage
     Figure 2 Specifications and storage
     

     Table 2 Specifications and storage

     Parameter	Description
     Instance Class	Refers to the vCPU and memory of a DB instance. Different instance classes support different numbers of database connections and maximum IOPS. After a DB instance is created, you can change its vCPU and memory. For details, see Changing a DB Instance Class.
     Storage Space (GB)	Contains the system overhead required for inodes, reserved blocks, 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.

   • Network and database configuration
     Figure 3 Network and database configuration
     

     Table 3 Network

     Parameter	Description
     VPC	A virtual network in which your RDS DB instances are located. A VPC can isolate networks for different workloads. You can select an existing VPC or create a VPC. For details about how to create a VPC, see "Creating a VPC" in Virtual Private Cloud User Guide. If no VPC is available, RDS allocates a VPC to you by default. NOTICE: After a DB instance is created, the VPC cannot be changed.
     Subnet	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 IPv4 floating IP address in the subnet CIDR block.
     Security Group	Enhances security by controlling access to RDS from other services. A network access control list (ACL) can help control inbound and outbound traffic of subnets in your VPC. Ensure that the security group you select allows the client to access the DB instance. If no security group is available or has been created, RDS allocates a security group to you by default.

     Table 4 Database configuration

     Parameter	Description
     Administrator	The default login name for the database is root.
     Administrator Password	Must consist of 8 to 32 characters and contain the following character types: uppercase letters, lowercase letters, digits, and special characters (~!@#$%^*-_=+?,()&). Enter a strong password and periodically change it for security reasons. If the password you provide is regarded as a weak password by the system, you will be prompted to enter a stronger password. 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 a primary/standby DB pair, they use the same parameter template. You can modify the instance parameters as required after the DB instance is created. For details, see Modifying Parameters in a Parameter Template.
     Table Name	Specifies whether table names are case sensitive. NOTE: The case sensitivity of table names for created instances cannot be changed.
     Enterprise Project	If your account has been associated with an enterprise project, select the target project from the Enterprise Project drop-down list. For more information about enterprise projects, see Enterprise Management User Guide.

   • Tags

     Table 5 Tags

     Parameter

     Description

     Tag

     Tags an RDS DB instance. This parameter is optional. Adding tags to RDS DB instances helps you better identify and manage the DB instances. A maximum of 20 tags can be added for each DB instance. If your organization has configured tag policies for RDS, add tags to DB instances based on the policies. If a tag does not comply with the policies, DB instance creation may fail. Contact your organization administrator to learn more about tag policies. After a DB instance is created, you can view its tag details on the Tags page. For details, see Managing Tags.

   • Purchase period

     Table 6 Purchase period

     Parameter	Description
     Quantity	RDS supports DB instance creation in batches. If you choose to create primary/standby DB instances and set Quantity to 1, a primary DB instance and a standby DB instance will be created synchronously.

   

   • If you have any questions about the price, move the cursor to in the Price area at the bottom of the page and click Pricing details.
   • The performance of your DB instance depends on its configurations. Hardware configuration items include the instance specifications, storage type, and storage space.

3. Confirm the specifications.
   • If you do not need to modify your settings, click Submit.
   • If you need to modify your settings, click Previous.

4. To view and manage your DB instance, go to the Instances page.
   • When your DB instance is being created, the status is Creating. The status changes to Available after the instance is created. To view the detailed progress and result of the creation, go to the Task Center page.
   • The automated backup policy is enabled by default. You can change it after the DB instance is created. An automated full backup is immediately triggered once your DB instance is created.
   • After a DB instance is created, you can enter a description for it.
   • The default database port is 3306. You can change it after a DB instance is created.
     

     You are advised to change the default database port in a timely manner. For details, see Changing a Database Port.