CfnEventSubscription

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* .

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

Default: - true

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.

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.

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`

The name of the subscription. Constraints: The name must be less than 255 characters.

An optional array of key-value pairs to apply to this subscription.