DB Instances

DB instances are the smallest management units used by RDS. Each is an isolated database environment on the cloud. You can use RDS to create and manage DB instances running various DB engines. For details about DB instance types, specifications, engines, versions, and statuses, see DB Instance Description.

DB Engines

RDS supports the following DB engines:

• MySQL
• PostgreSQL
• Microsoft SQL Server

For details about the supported versions, see DB Engines and Versions.

DB Instance Types

RDS DB instances are classified into the following types: single and primary/standby. Different types of DB instances support different DB engines and instance specifications.

For details about the product series, see DB Instance Introduction and Function Comparison.

DB Instance Classes

For details about supported DB engines and instance classes, including the number of vCPUs and memory (GB), see DB Instance Classes.

Automated Backups

When you create a DB instance, an automated backup policy is enabled by default. After the DB instance is created, you can modify the policy. RDS will automatically create full backups for DB instances based on your settings.

Manual Backups

Manual backups are user-initiated full backups of DB instances. They are retained until you delete them manually.

Regions and AZs

A region and availability zone (AZ) identify the location of a data center. You can create resources in a specific region and AZ.

• Regions are divided from the dimensions of geographical location and network latency. Public services, such as Elastic Cloud Server (ECS), Elastic Volume Service (EVS), Object Storage Service (OBS), Virtual Private Cloud (VPC), Elastic IP (EIP), and Image Management Service (IMS), are shared within the same region. Regions are classified as universal regions and dedicated regions. A universal region provides universal cloud services for common tenants. A dedicated region provides services of the same type only or for specific tenants.
• An AZ contains one or multiple physical data centers. Each AZ has independent cooling, fire extinguishing, moisture-proof, and electricity facilities. Within an AZ, computing, network, storage, and other resources are logically divided into multiple clusters. AZs within a region are interconnected using high-speed optical fibers to allow you to build cross-AZ high-availability systems.

Figure 1 shows the relationship between regions and AZs.

Figure 1 Regions and AZs

HUAWEI CLOUD provides services in many regions around the world. You can select a region and AZ as needed. For more information, see HUAWEI CLOUD Global Regions.

Projects

Projects are used to group and isolate OpenStack resources (computing resources, storage resources, and network resources). A project can be a department or a project team. Multiple projects can be created for one account.