RDS / Client / modify_current_db_cluster_capacity



Set the capacity of an Aurora Serverless v1 DB cluster to a specific value.

Aurora Serverless v1 scales seamlessly based on the workload on the DB cluster. In some cases, the capacity might not scale fast enough to meet a sudden change in workload, such as a large number of new transactions. Call ModifyCurrentDBClusterCapacity to set the capacity explicitly.

After this call sets the DB cluster capacity, Aurora Serverless v1 can automatically scale the DB cluster based on the cooldown period for scaling up and the cooldown period for scaling down.

For more information about Aurora Serverless v1, see Using Amazon Aurora Serverless v1 in the Amazon Aurora User Guide.


If you call ModifyCurrentDBClusterCapacity with the default TimeoutAction, connections that prevent Aurora Serverless v1 from finding a scaling point might be dropped. For more information about scaling points, see Autoscaling for Aurora Serverless v1 in the Amazon Aurora User Guide.


This operation only applies to Aurora Serverless v1 DB clusters.

See also: AWS API Documentation

Request Syntax

response = client.modify_current_db_cluster_capacity(
  • DBClusterIdentifier (string) –


    The DB cluster identifier for the cluster being modified. This parameter isn’t case-sensitive.


    • Must match the identifier of an existing DB cluster.

  • Capacity (integer) –

    The DB cluster capacity.

    When you change the capacity of a paused Aurora Serverless v1 DB cluster, it automatically resumes.


    • For Aurora MySQL, valid capacity values are 1, 2, 4, 8, 16, 32, 64, 128, and 256.

    • For Aurora PostgreSQL, valid capacity values are 2, 4, 8, 16, 32, 64, 192, and 384.

  • SecondsBeforeTimeout (integer) –

    The amount of time, in seconds, that Aurora Serverless v1 tries to find a scaling point to perform seamless scaling before enforcing the timeout action. The default is 300.

    Specify a value between 10 and 600 seconds.

  • TimeoutAction (string) –

    The action to take when the timeout is reached, either ForceApplyCapacityChange or RollbackCapacityChange.

    ForceApplyCapacityChange, the default, sets the capacity to the specified value as soon as possible.

    RollbackCapacityChange ignores the capacity change if a scaling point isn’t found in the timeout period.

Return type:



Response Syntax

    'DBClusterIdentifier': 'string',
    'PendingCapacity': 123,
    'CurrentCapacity': 123,
    'SecondsBeforeTimeout': 123,
    'TimeoutAction': 'string'

Response Structure

  • (dict) –

    • DBClusterIdentifier (string) –

      A user-supplied DB cluster identifier. This identifier is the unique key that identifies a DB cluster.

    • PendingCapacity (integer) –

      A value that specifies the capacity that the DB cluster scales to next.

    • CurrentCapacity (integer) –

      The current capacity of the DB cluster.

    • SecondsBeforeTimeout (integer) –

      The number of seconds before a call to ModifyCurrentDBClusterCapacity times out.

    • TimeoutAction (string) –

      The timeout action of a call to ModifyCurrentDBClusterCapacity, either ForceApplyCapacityChange or RollbackCapacityChange.


  • RDS.Client.exceptions.DBClusterNotFoundFault

  • RDS.Client.exceptions.InvalidDBClusterStateFault

  • RDS.Client.exceptions.InvalidDBClusterCapacityFault