HeatWave Release Notes
The source data is read from Object Storage, transformed to the memory optimized HeatWave format, stored in the HeatWave persistence storage layer in Object Storage, and then loaded to HeatWave cluster memory. This data is not directly accessed by end-users of the service. This memory optimized internal version of the data is retained only as long as the HeatWave Cluster has the Lakehouse option enabled.
The data is deleted if the external table is dropped or unloaded, or if the HeatWave Cluster is deleted.