# ParameterGroup

A parameter group.

Represents both a cluster parameter group (AWS::RDS::DBClusterParameterGroup),
and an instance parameter group (AWS::RDS::DBParameterGroup).

Extends: Construct › Resource › ParameterGroup
Implements: IResource, IParameterGroup, IEnvironmentAware, IDBClusterParameterGroupRef, IDBParameterGroupRef, IConstruct, IDependable

- CloudFormation: [`AWS::RDS::DBParameterGroup`](https://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/aws-resource-rds-dbparametergroup.html)
- L1 type: [`CfnDBParameterGroup`](/cdk/api/v2/docs/aws-cdk-lib.aws_rds.CfnDBParameterGroup.html)
- Source: [`aws-rds/lib/parameter-group.ts`](https://github.com/aws/aws-cdk/blob/v2.274.0/packages/aws-cdk-lib/aws-rds/lib/parameter-group.ts#L118)
- Type last changed: v2.244.0 · 19 Mar 2026

## 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
  }
});
```

## Initializer

```ts
new ParameterGroup(scope: Construct, id: string, props: ParameterGroupProps)
```

## Construct Props

- `description`: string = a CDK generated description — Description for this parameter group.

- `engine`: [IEngine](/cdk/api/v2/docs/aws-cdk-lib.aws_rds.IEngine.html) (required) — The database engine for this parameter group.

- `name`: string = CloudFormation-generated name — The name of this parameter group.

- `parameters`: { [key: string]: string } = None — The parameters in this parameter group.

- `removalPolicy`: [RemovalPolicy](/cdk/api/v2/docs/aws-cdk-lib.RemovalPolicy.html) = RemovalPolicy.DESTROY — The CloudFormation policy to apply when the instance is removed from the stack or replaced during an update.

## Properties

- `dbClusterParameterGroupRef`: [DBClusterParameterGroupReference](/cdk/api/v2/docs/aws-cdk-lib.interfaces.aws_rds.DBClusterParameterGroupReference.html) (required) — A reference to this parameter group as a DB cluster parameter group.

- `dbParameterGroupRef`: [DBParameterGroupReference](/cdk/api/v2/docs/aws-cdk-lib.interfaces.aws_rds.DBParameterGroupReference.html) (required) — A reference to this parameter group as a DB parameter group.

- `env`: [ResourceEnvironment](/cdk/api/v2/docs/aws-cdk-lib.interfaces.ResourceEnvironment.html) (required) — The environment this resource belongs to.

  For resources that are created and managed in a Stack (those created by
  creating new class instances like `new Role()`, `new Bucket()`, etc.), this
  is always the same as the environment of the stack they belong to.

  For referenced resources (those obtained from referencing methods like
  `Role.fromRoleArn()`, `Bucket.fromBucketName()`, etc.), they might be
  different than the stack they were imported into.

- `node`: [Node](/cdk/api/v2/docs/constructs.Node.html) (required) — The tree node.

- `PROPERTY_INJECTION_ID`: string (required) (static) — Uniquely identifies this class.

- `stack`: [Stack](/cdk/api/v2/docs/aws-cdk-lib.Stack.html) (required) — The stack in which this resource is defined.

## Methods

- `addParameter(key: string, value: string): boolean` — Add a parameter to this parameter group.

  **Parameters**

  - `key` — The key of the parameter to be added.
  - `value` — The value of the parameter to be added.

- `applyCrossStackReferenceStrength(strength: ReferenceStrength): void` — Override the cross-stack reference strength for this resource.

  When set, any cross-stack reference to this resource will use the specified
  mechanism instead of the global default determined by the
  `@aws-cdk/core:defaultCrossStackReferences` context key. This is useful for
  selectively weakening specific references to avoid the "deadly embrace" problem
  without changing the app-wide default.

  **Parameters**

  - `strength` — - The reference strength to use for this resource.

- `applyRemovalPolicy(policy: RemovalPolicy): void` — Apply the given removal policy to this resource.

  The Removal Policy controls what happens to this resource when it stops
  being managed by CloudFormation, either because you've removed it from the
  CDK application or because you've made a change that requires the resource
  to be replaced.

  The resource can be deleted (`RemovalPolicy.DESTROY`), or left in your AWS
  account for data recovery and cleanup later (`RemovalPolicy.RETAIN`).

- `bindToCluster(_options: ParameterGroupClusterBindOptions): ParameterGroupClusterConfig` — Method called when this Parameter Group is used when defining a database cluster.

- `bindToInstance(_options: ParameterGroupInstanceBindOptions): ParameterGroupInstanceConfig` — Method called when this Parameter Group is used when defining a database instance.

- `forCluster(scope: Construct, id: string, props: ParameterGroupProps): IParameterGroup` (static) — Creates a standalone cluster parameter group.

  This method allows you to explicitly create a parameter group
  without binding it to a database cluster.

  **Returns:** cluster parameter group (AWS::RDS::DBClusterParameterGroup)

- `forInstance(scope: Construct, id: string, props: ParameterGroupProps): IParameterGroup` (static) — Creates a standalone instance parameter group.

  This method allows you to explicitly create a parameter group
  without binding it to a database instance.

  **Returns:** instance parameter group (AWS::RDS::DBParameterGroup)

- `fromParameterGroupName(scope: Construct, id: string, parameterGroupName: string): IParameterGroup` (static) — Imports a parameter group.

  `dbParameterGroupRef.dbParameterGroupArn` is an instance DB parameter group ARN, and is not valid
  for a cluster parameter group.

- `isConstruct(x: any): boolean` (static) — Checks if `x` is a construct.

  Use this method instead of `instanceof` to properly detect `Construct`
  instances, even when the construct library is symlinked.

  Explanation: in JavaScript, multiple copies of the `constructs` library on
  disk are seen as independent, completely different libraries. As a
  consequence, the class `Construct` in each copy of the `constructs` library
  is seen as a different class, and an instance of one class will not test as
  `instanceof` the other class. `npm install` will not create installations
  like this, but users may manually symlink construct libraries together or
  use a monorepo tool: in those cases, multiple copies of the `constructs`
  library can be accidentally installed, and `instanceof` will behave
  unpredictably. It is safest to avoid using `instanceof`, and using
  this type-testing method instead.

  **Parameters**

  - `x` — Any object.

  **Returns:** true if `x` is an object created from a class which extends `Construct`.

- `isOwnedResource(construct: IConstruct): boolean` (static) — Returns true if the construct was created by CDK, and false otherwise.

- `isResource(construct: IConstruct): boolean` (static) — Check whether the given construct is a Resource.

- `toString(): string` — Returns a string representation of this construct.

- `with(...mixins: IMixin[]): IConstruct` — Applies one or more mixins to this construct.

  Mixins are applied in order. The list of constructs is captured at the
  start of the call, so constructs added by a mixin will not be visited.
  Use multiple `with()` calls if subsequent mixins should apply to added
  constructs.