Relational Database ServiceRelational Database Service

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Updated at: Apr 02, 2022 GMT+08:00

Storage Autoscaling


With storage autoscaling enabled, when RDS detects that you are running out of database space, it automatically scales up your storage.

Autoscaling up the storage of a read replica does not affect that of the primary DB instance. Therefore, you can separately autoscale read replicas to meet service requirements. New storage space of read replicas after autoscaling up must be greater than or equal to that of the primary DB instance.

You can enable storage autoscaling in either of the following ways:

  • Enable this function when you create a DB instance. For details, see Buy an RDS for MySQL DB Instance.
  • Enable this function after you create a DB instance. See the operations provided in this section.


  • You can enable storage autoscaling only when your account balance is greater than or equal to $0 USD.
  • To apply for the storage autoscaling permission, submit a service ticket by choosing Service Tickets > Create Service Ticket in the upper right corner of the management console.
  • Storage autoscaling for RDS for MySQL DB instances is supported only for ultra-high I/O, cloud SSD, and extreme SSD storage types. For details about storage types, see DB Instance Storage Types.
  • The maximum allowed storage is 4,000 GB.
  • For primary/standby DB instances, autoscaling the storage for the primary DB instance will also autoscale the storage for the standby DB instance.


  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 the target DB instance or read replica (click in front of a DB instance to locate the read replica).
  5. In the Storage Space area, click Configure Autoscaling.

    Figure 1 Storage space

  6. In the displayed dialog box, set the following parameters:

    Figure 2 Configuring autoscaling
    Table 1 Parameter description



    Enable autoscaling

    If you select this option, autoscaling is enabled.

    Trigger If Available Storage Drops To

    If the available storage drops to a specified threshold or 10 GB, autoscaling is triggered.

    Autoscaling Limit

    The default value range is from 40 GB to 4,000 GB. The limit must be no less than the storage of the DB instance.

  7. Click OK.

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