Help Center > > User Guide> Working with RDS for MySQL> Reserved DB Instances> Buying a Reserved DB Instance

Buying a Reserved DB Instance

Updated at: May 26, 2020 GMT+08:00

Scenarios

You can buy a reserved DB instance on the RDS console.

Procedure

  1. Log in to the management console.
  2. Click in the upper left corner and select a region and a project.
  3. Click Service List. Under Database, click RDS. The RDS console is displayed.
  4. In the navigation pane on the left, choose Reserved Instance Management and click Buy Reserved DB Instance in the upper right corner.
  5. On the displayed page, configure information about the reserved DB instance and click Next.

    Table 1 Basic information

    Parameter

    Description

    Region

    A region where the tenant is located. It can be changed in the upper left corner of the page.

    NOTICE:

    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.

    Reserved DB Instance Name

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

    DB Engine

    MySQL, PostgreSQL, and Microsoft SQL Server are available for your selection.

    DB Engine Version

    For details, see DB Engines and Versions.

    Different DB engine versions are supported in different regions.

    DB Instance Type and AZ

    • Primary/Standby: You will have both a primary DB instance and a synchronous standby DB instance. The standby DB instance improves instance reliability and is invisible to you after being created.
    • Single: Only one DB instance is created.
      NOTE:

      Primary/Standby DB instances are recommended because they improve data reliability. Single DB instances are suitable for learning, developing, and testing.

    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 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 and 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.

    NOTE:

    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.

    RDS supports deploying primary and standby DB instances in an AZ or across AZs. You can determine whether the standby AZ is the same as the primary AZ.

    • If they are the same, the primary and standby DB instances are deployed in the same AZ.
    • If they are different (by default), the primary and standby DB instances are deployed in different AZs to ensure failover support and high availability.

    Instance Class

    Indicates the CPU and memory of a DB instance. Different instance classes refer to different numbers of database connections and normalization factors.

    For details about instance classes, see DB Instance Classes.

    Payment Option

    Indicates the payment option of a reserved DB instance. Currently, only all upfront is supported.

    Term

    Indicates the validity period of a reserved DB instance. You can reserve a DB instance for a one- or three-year term.

    Quantity

    Indicates the number of reserved DB instances to be purchased.

  6. Confirm your specifications.

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

  7. On the displayed page, select a payment method and click Pay.
  8. To view and manage the reserved DB instance, go to the Reserved Instance Management page.

    Creating a reserved DB instance takes several minutes. During the creation process, the status displayed in the reserved DB instance list is Creating.

    To refresh the DB instance list, click in the upper right corner of the list. When the creation process is complete, the instance status will change to Available.

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