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User Guide

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[ aws . rds ]



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

Aurora Serverless 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 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, see Using Amazon Aurora Serverless in the Amazon Aurora User Guide .


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


This action only applies to Aurora Serverless DB clusters.

See also: AWS API Documentation

See 'aws help' for descriptions of global parameters.


--db-cluster-identifier <value>
[--capacity <value>]
[--seconds-before-timeout <value>]
[--timeout-action <value>]
[--cli-input-json <value>]
[--generate-cli-skeleton <value>]


--db-cluster-identifier (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 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 .

--seconds-before-timeout (integer)

The amount of time, in seconds, that Aurora Serverless 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.

--timeout-action (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.

--cli-input-json (string) Performs service operation based on the JSON string provided. The JSON string follows the format provided by --generate-cli-skeleton. If other arguments are provided on the command line, the CLI values will override the JSON-provided values. It is not possible to pass arbitrary binary values using a JSON-provided value as the string will be taken literally.

--generate-cli-skeleton (string) Prints a JSON skeleton to standard output without sending an API request. If provided with no value or the value input, prints a sample input JSON that can be used as an argument for --cli-input-json. If provided with the value output, it validates the command inputs and returns a sample output JSON for that command.

See 'aws help' for descriptions of global parameters.


To scale the capacity of an Aurora Serverless DB cluster

The following modify-current-db-cluster-capacity example scales the capacity of an Aurora Serverless DB cluster to 8.

aws rds modify-current-db-cluster-capacity \
    --db-cluster-identifier mydbcluster \
    --capacity 8


    "DBClusterIdentifier": "mydbcluster",
    "PendingCapacity": 8,
    "CurrentCapacity": 1,
    "SecondsBeforeTimeout": 300,
    "TimeoutAction": "ForceApplyCapacityChange"

For more information, see Scaling Aurora Serverless v1 DB cluster capacity manually in the Amazon Aurora User Guide.


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 .