**To describe event categories**

This example describes the event categories for all available event sources::

    aws rds describe-event-categories

Output::

{
    "EventCategoriesMapList": [
        {
            "SourceType": "db-instance",
            "EventCategories": [
                "deletion",
                "read replica",
                "failover",
                "restoration",
                "maintenance",
                "low storage",
                "configuration change",
                "backup",
                "creation",
                "availability",
                "recovery",
                "failure",
                "backtrack",
                "notification"
            ]
        },
        {
            "SourceType": "db-security-group",
            "EventCategories": [
                "configuration change",
                "failure"
            ]
        },
        {
            "SourceType": "db-parameter-group",
            "EventCategories": [
                "configuration change"
            ]
        },
        {
            "SourceType": "db-snapshot",
            "EventCategories": [
                "deletion",
                "creation",
                "restoration",
                "notification"
            ]
        },
        {
            "SourceType": "db-cluster",
            "EventCategories": [
                "failover",
                "failure",
                "notification"
            ]
        },
        {
            "SourceType": "db-cluster-snapshot",
            "EventCategories": [
                "backup"
            ]
        }
    ]
}