These QoS are applied per-instance.

For example, the DDS_HistoryQosPolicy::depth configures the number of samples that are stored in the DataWriter and DataReader queues per-instance.

Basic Settings


DDS_DurabilityQosPolicy	writer_depth
	<<basic>> <<extension>> Indicates the number of samples per instance that a durable DDS_DataWriter will send to a late-joining DDS_DataReader.

DDS_DeadlineQosPolicy	period
	<<basic>> <<spec>> Duration of the deadline period.

DDS_OwnershipQosPolicy	kind
	<<basic>> <<spec>> The kind of ownership

DDS_OwnershipStrengthQosPolicy	value
	<<basic>> <<spec>> The strength value used to arbitrate among multiple writers.

DDS_TimeBasedFilterQosPolicy	minimum_separation
	<<basic>> <<spec>> The minimum separation duration between subsequent samples.

DDS_DestinationOrderQosPolicy	kind
	<<basic>> <<spec>> Specifies the desired kind of destination order.

DDS_HistoryQosPolicy	kind
	<<basic>> <<spec>> Specifies the kind of history to be kept.

DDS_HistoryQosPolicy	depth
	<<basic>> <<spec>> Specifies the number of samples per instance to be kept, when the `kind` is DDS_KEEP_LAST_HISTORY_QOS

Advanced Settings


DDS_DurabilityServiceQosPolicy	history_kind
	<<spec>> The kind of history to apply in recouping durable data.

DDS_DurabilityServiceQosPolicy	history_depth
	<<spec>> Setting to use for the DDS_DurabilityQosPolicy::writer_depth when recouping durable data.

DDS_PresentationQosPolicy	access_scope
	<<spec>> Determines the largest scope spanning the entities for which the order and coherency of changes can be preserved.

DDS_PresentationQosPolicy	ordered_access
	<<spec>> Specifies support for ordered access to the samples received at the subscription end. Controls whether ordered access is supported within the scope `access_scope`.

DDS_DestinationOrderQosPolicy	scope
	<<spec>> Specifies the desired scope of the source destination order.

DDS_DestinationOrderQosPolicy	source_timestamp_tolerance
	<<extension>> Allowed tolerance between source timestamps of consecutive samples.