**To describe event categories** The following ``describe-event-categories`` example retrieves details about 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" ] } ] }