Database Autonomy Service (DAS) monitors the storage space of a database instance and can automatically expand the storage space to ensure the stability of your business. This topic describes how to enable the automatic space expansion feature.


  • An ApsaraDB for RDS database with standard SSDs or enhanced SSDs (ESSDs) is connected to DAS.
  • The autonomy service is enabled for the database instance. For more information, see Autonomy center.


  1. Log on to the DAS console.
  2. In the left-side navigation pane, click Instance Monitoring.
  3. On the Instance Monitoring page, find the target instance and click the instance ID to go to the instance details page.
  4. In the left-side navigation pane, click Autonomy Center.
  5. On the Autonomy Center page, click Switch Settings in the upper-right corner.
  6. In the Switch Settings dialog box, turn on Automatic Space Expansion.
  7. Specify the maximum storage space in the Maximum Storage of Automatic Expansion field.
    Note The billing rules are the same as those for manually expanding the storage space of an ApsaraDB for RDS instance. For more information, see Specification change fees.
  8. Click OK.