The DURABILITY QosPolicy controls whether or not, and how, published samples are stored by the DataWriter application for DataReaders that are found after the samples were initially written. The samples stored by the DataWriter constitute the DataWriter’s history.
Connext DDS provides the capability to make the DataWriter history durable, by persisting its content in a relational database. This makes it possible for the history to be restored when the DataWriter restarts. See the RTI Connext DDS Core Libraries Release Notes for the list of supported relational databases.
The association between the history stored in the database and the DataWriter is done using the virtual GUID.
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