# CfnEventSubscription

The `AWS::RDS::EventSubscription` resource allows you to receive notifications for Amazon Relational Database Service events through the Amazon Simple Notification Service (Amazon SNS).

For more information, see [Using Amazon RDS Event Notification](https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_Events.html) in the *Amazon RDS User Guide* .

Extends: Construct › CfnElement › CfnRefElement › CfnResource › CfnEventSubscription
Implements: IInspectable, ITaggable, IEnvironmentAware, IEventSubscriptionRef, IConstruct, IDependable

- CloudFormation: [`AWS::RDS::EventSubscription`](https://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/aws-resource-rds-eventsubscription.html)
- Source: Generated code
- Type last changed: v2.252.0 · 30 Apr 2026

## Example

```ts
// The code below shows an example of how to instantiate this type.
// The values are placeholders you should change.
import { aws_rds as rds } from 'aws-cdk-lib';
const cfnEventSubscription = new rds.CfnEventSubscription(this, 'MyCfnEventSubscription', {
  snsTopicArn: 'snsTopicArn',

  // the properties below are optional
  enabled: false,
  eventCategories: ['eventCategories'],
  sourceIds: ['sourceIds'],
  sourceType: 'sourceType',
  subscriptionName: 'subscriptionName',
  tags: [{
    key: 'key',
    value: 'value',
  }],
});
```

## Initializer

```ts
new CfnEventSubscription(scope: Construct, id: string, props: CfnEventSubscriptionProps)
```

## Construct Props

- `enabled`: boolean | [IResolvable](/cdk/api/v2/docs/aws-cdk-lib.IResolvable.html) = true — Specifies whether to activate the subscription.

  If the event notification subscription isn't activated, the subscription is created but not active.

- `eventCategories`: string[] — A list of event categories for a particular source type ( `SourceType` ) that you want to subscribe to.

  You can see a list of the categories for a given source type in the "Amazon RDS event categories and event messages" section of the [*Amazon RDS User Guide*](https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_Events.Messages.html) or the [*Amazon Aurora User Guide*](https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/USER_Events.Messages.html) . You can also see this list by using the `DescribeEventCategories` operation.

- `snsTopicArn`: string | [ITopicRef](/cdk/api/v2/docs/aws-cdk-lib.interfaces.aws_sns.ITopicRef.html) (required) — The Amazon Resource Name (ARN) of the SNS topic created for event notification.

  SNS automatically creates the ARN when you create a topic and subscribe to it.

  > RDS doesn't support FIFO (first in, first out) topics. For more information, see [Message ordering and deduplication (FIFO topics)](https://docs.aws.amazon.com/sns/latest/dg/sns-fifo-topics.html) in the *Amazon Simple Notification Service Developer Guide* .

- `sourceIds`: string | [IDBClusterRef](/cdk/api/v2/docs/aws-cdk-lib.interfaces.aws_rds.IDBClusterRef.html) | [IDBInstanceRef](/cdk/api/v2/docs/aws-cdk-lib.interfaces.aws_rds.IDBInstanceRef.html)[] — The list of identifiers of the event sources for which events are returned.

  If not specified, then all sources are included in the response. An identifier must begin with a letter and must contain only ASCII letters, digits, and hyphens. It can't end with a hyphen or contain two consecutive hyphens.

  Constraints:

  - If `SourceIds` are supplied, `SourceType` must also be provided.
  - If the source type is a DB instance, a `DBInstanceIdentifier` value must be supplied.
  - If the source type is a DB cluster, a `DBClusterIdentifier` value must be supplied.
  - If the source type is a DB parameter group, a `DBParameterGroupName` value must be supplied.
  - If the source type is a DB security group, a `DBSecurityGroupName` value must be supplied.
  - If the source type is a DB snapshot, a `DBSnapshotIdentifier` value must be supplied.
  - If the source type is a DB cluster snapshot, a `DBClusterSnapshotIdentifier` value must be supplied.
  - If the source type is an RDS Proxy, a `DBProxyName` value must be supplied.

- `sourceType`: string — The type of source that is generating the events.

  For example, if you want to be notified of events generated by a DB instance, you set this parameter to `db-instance` . For RDS Proxy events, specify `db-proxy` . If this value isn't specified, all events are returned.

  Valid Values: `db-instance | db-cluster | db-parameter-group | db-security-group | db-snapshot | db-cluster-snapshot | db-proxy | zero-etl | custom-engine-version | blue-green-deployment`

- `subscriptionName`: string — The name of the subscription.

  Constraints: The name must be less than 255 characters.

- `tags`: [CfnTag](/cdk/api/v2/docs/aws-cdk-lib.CfnTag.html)[] — An optional array of key-value pairs to apply to this subscription.

## Properties

- `CFN_RESOURCE_TYPE_NAME`: string (static) — The CloudFormation resource type name for this resource class.

- `cfnOptions`: [ICfnResourceOptions](/cdk/api/v2/docs/aws-cdk-lib.ICfnResourceOptions.html) — Options for this resource, such as condition, update policy etc.

- `cfnResourceType`: string — AWS resource type.

- `creationStack`: string[]

- `enabled`: boolean | [IResolvable](/cdk/api/v2/docs/aws-cdk-lib.IResolvable.html) — Specifies whether to activate the subscription.

- `env`: [ResourceEnvironment](/cdk/api/v2/docs/aws-cdk-lib.interfaces.ResourceEnvironment.html)

- `eventCategories`: string[] — A list of event categories for a particular source type ( `SourceType` ) that you want to subscribe to.

- `eventSubscriptionRef`: [EventSubscriptionReference](/cdk/api/v2/docs/aws-cdk-lib.interfaces.aws_rds.EventSubscriptionReference.html) — A reference to a EventSubscription resource.

- `logicalId`: string — The logical ID for this CloudFormation stack element.

  The logical ID of the element
  is calculated from the path of the resource node in the construct tree.

  To override this value, use `overrideLogicalId(newLogicalId)`.

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

- `ref`: string — Return a string that will be resolved to a CloudFormation `{ Ref }` for this element.

  If, by any chance, the intrinsic reference of a resource is not a string, you could
  coerce it to an IResolvable through `Lazy.any({ produce: resource.ref })`.

- `snsTopicArn`: string — The Amazon Resource Name (ARN) of the SNS topic created for event notification.

- `sourceIds`: string[] — The list of identifiers of the event sources for which events are returned.

- `sourceType`: string — The type of source that is generating the events.

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

  CfnElements must be defined within a stack scope (directly or indirectly).

- `subscriptionName`: string — The name of the subscription.

- `tags`: [TagManager](/cdk/api/v2/docs/aws-cdk-lib.TagManager.html) — Tag Manager which manages the tags for this resource.

- `tagsRaw`: [CfnTag](/cdk/api/v2/docs/aws-cdk-lib.CfnTag.html)[] — An optional array of key-value pairs to apply to this subscription.

## Methods

- `addDeletionOverride(path: string): void` — Syntactic sugar for `addOverride(path, undefined)`.

  **Parameters**

  - `path` — The path of the value to delete.

- `addDependency(target: CfnResource): void` — Use `addResourceDependency` instead.

  This method has been renamed to `addResourceDependency` to more clearly
  set it apart from `construct.node.addDependency`. See the documentation
  of that function for more details.

- `addDependsOn(target: CfnResource): void` — Use `addResourceDependency` instead.

  This can be used for resources across stacks (or nested stack) boundaries
  and the dependency will automatically be transferred to the relevant scope.

  This method has been renamed to `addResourceDependency`, which makes it
  more clear that this method operates at a different level from the
  construct-level `construct.node.addDependency()` mechanism.

- `addMetadata(key: string, value: any): void` — Add a value to the CloudFormation Resource Metadata.

- `addOverride(path: string, value: any): void` — Adds an override to the synthesized CloudFormation resource.

  To add a
  property override, either use `addPropertyOverride` or prefix `path` with
  "Properties." (i.e. `Properties.TopicName`).

  If the override is nested, separate each nested level using a dot (.) in the path parameter.
  If there is an array as part of the nesting, specify the index in the path.

  To include a literal `.` in the property name, prefix with a `\`. In most
  programming languages you will need to write this as `"\\."` because the
  `\` itself will need to be escaped.

  For example,
  ```typescript
  cfnResource.addOverride('Properties.GlobalSecondaryIndexes.0.Projection.NonKeyAttributes', ['myattribute']);
  cfnResource.addOverride('Properties.GlobalSecondaryIndexes.1.ProjectionType', 'INCLUDE');
  ```
  would add the overrides
  ```json
  "Properties": {
    "GlobalSecondaryIndexes": [
      {
        "Projection": {
          "NonKeyAttributes": [ "myattribute" ]
          ...
        }
        ...
      },
      {
        "ProjectionType": "INCLUDE"
        ...
      },
    ]
    ...
  }
  ```

  The `value` argument to `addOverride` will not be processed or translated
  in any way. Pass raw JSON values in here with the correct capitalization
  for CloudFormation. If you pass CDK classes or structs, they will be
  rendered with lowercased key names, and CloudFormation will reject the
  template.

  **Parameters**

  - `path` — - The path of the property, you can use dot notation to override values in complex types.
  - `value` — - The value.

- `addPropertyDeletionOverride(propertyPath: string): void` — Adds an override that deletes the value of a property from the resource definition.

  **Parameters**

  - `propertyPath` — The path to the property.

- `addPropertyOverride(propertyPath: string, value: any): void` — Adds an override to a resource property.

  Syntactic sugar for `addOverride("Properties.<...>", value)`.

  **Parameters**

  - `propertyPath` — The path of the property.
  - `value` — The value.

- `addResourceDependency(target: CfnResource, reason?: string): void` — Indicates that this resource depends on another resource and cannot be provisioned unless the other resource has been successfully provisioned.

  This can be used for resources across stacks (or nested stack) boundaries
  and the dependency will automatically be transferred to the relevant scope.

  This method only adds dependencies between L1 resources. If you are
  looking for a generic construct-to-construct dependency mechanism that works
  for all constructs including L2s, use `construct.node.addDependency` instead.

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

  When set, any cross-stack reference to this resource will use the specified
  strength instead of the global default from the consuming stack's context.

  **Parameters**

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

- `applyRemovalPolicy(policy?: RemovalPolicy, options?: RemovalPolicyOptions): void` — Sets the deletion policy of the resource based on the removal policy specified.

  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`). In some
  cases, a snapshot can be taken of the resource prior to deletion
  (`RemovalPolicy.SNAPSHOT`). A list of resources that support this policy
  can be found in the following link:

- `arnForEventSubscription(resource: IEventSubscriptionRef): string` (static)

- `cfnPropertyName(cdkPropertyName: string): string`

- `fromSubscriptionName(scope: Construct, id: string, subscriptionName: string): IEventSubscriptionRef` (static) — Creates a new IEventSubscriptionRef from a subscriptionName.

- `getAtt(attributeName: string, typeHint?: ResolutionTypeHint): Reference` — Returns a token for an runtime attribute of this resource.

  Ideally, use generated attribute accessors (e.g. `resource.arn`), but this can be used for future compatibility
  in case there is no generated attribute.

  **Parameters**

  - `attributeName` — The name of the attribute.

- `getMetadata(key: string): any` — Retrieve a value value from the CloudFormation Resource Metadata.

- `inspect(inspector: TreeInspector): void` — Examines the CloudFormation resource and discloses attributes.

  **Parameters**

  - `inspector` — tree inspector to collect and process attributes.

- `isCfnElement(x: any): boolean` (static) — Returns `true` if a construct is a stack element (i.e. part of the synthesized cloudformation template).

  Uses duck-typing instead of `instanceof` to allow stack elements from different
  versions of this library to be included in the same stack.

  **Returns:** The construct as a stack element or undefined if it is not a stack element.

- `isCfnEventSubscription(x: any): boolean` (static) — Checks whether the given object is a CfnEventSubscription.

- `isCfnResource(x: any): boolean` (static) — Check whether the given object is a CfnResource.

- `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`.

- `obtainDependencies(): Stack | CfnResource[]` — Retrieves an array of resources and stacks this resource depends on.

  For resources depended on directly, returns the `CfnResource` object. For
  dependencies on other stacks, returns the `Stack` object. The order of the
  array is not guaranteed.

- `overrideLogicalId(newLogicalId: string): void` — Overrides the auto-generated logical ID with a specific ID.

  **Parameters**

  - `newLogicalId` — The new logical ID to use for this stack element.

- `removeDependency(target: CfnResource): void` — Use `removeResourceDependency` instead

  This can be used for resources across stacks (including nested stacks)
  and the dependency will automatically be removed from the relevant scope.

- `removeResourceDependency(target: CfnResource): void` — Indicates that this resource no longer depends on another resource.

  This can be used for resources across stacks (including nested stacks)
  and the dependency will automatically be removed from the relevant scope.

- `replaceDependency(target: CfnResource, newTarget: CfnResource): void` — Replaces one dependency with another.

  **Parameters**

  - `target` — The dependency to replace.
  - `newTarget` — The new dependency to add.

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

  **Returns:** a string representation of this resource

- `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.