# AuroraCapacityUnit

Aurora capacity units (ACUs).

Each ACU is a combination of processing and memory capacity.

- Source: [`aws-rds/lib/serverless-cluster.ts`](https://github.com/aws/aws-cdk/blob/v2.275.0/packages/aws-cdk-lib/aws-rds/lib/serverless-cluster.ts#L242)

## Example

```ts
declare const vpc: ec2.Vpc;

const cluster = new rds.ServerlessCluster(this, 'AnotherCluster', {
  engine: rds.DatabaseClusterEngine.AURORA_POSTGRESQL,
  copyTagsToSnapshot: true, // whether to save the cluster tags when creating the snapshot. Default is 'true'
  parameterGroup: rds.ParameterGroup.fromParameterGroupName(this, 'ParameterGroup', 'default.aurora-postgresql11'),
  vpc,
  scaling: {
    autoPause: Duration.minutes(10), // default is to pause after 5 minutes of idle time
    minCapacity: rds.AuroraCapacityUnit.ACU_8, // default is 2 Aurora capacity units (ACUs)
    maxCapacity: rds.AuroraCapacityUnit.ACU_32, // default is 16 Aurora capacity units (ACUs)
    timeout: Duration.seconds(100), // default is 5 minutes
    timeoutAction: rds.TimeoutAction.FORCE_APPLY_CAPACITY_CHANGE // default is ROLLBACK_CAPACITY_CHANGE
  }
});
```

## Members

| Member | Description |
| --- | --- |
| `ACU_1` | 1 Aurora Capacity Unit. |
| `ACU_2` | 2 Aurora Capacity Units. |
| `ACU_4` | 4 Aurora Capacity Units. |
| `ACU_8` | 8 Aurora Capacity Units. |
| `ACU_16` | 16 Aurora Capacity Units. |
| `ACU_32` | 32 Aurora Capacity Units. |
| `ACU_64` | 64 Aurora Capacity Units. |
| `ACU_128` | 128 Aurora Capacity Units. |
| `ACU_192` | 192 Aurora Capacity Units. |
| `ACU_256` | 256 Aurora Capacity Units. |
| `ACU_384` | 384 Aurora Capacity Units. |

## Referenced by

- [`ServerlessScalingOptions`](/v2/docs/aws-cdk-lib.aws_rds.ServerlessScalingOptions).maxCapacity
- [`ServerlessScalingOptions`](/v2/docs/aws-cdk-lib.aws_rds.ServerlessScalingOptions).minCapacity