Attribute values are saved to the NMS database. As attribute data is saved to the NMS database, the size of the NMS database grows and the amount of free tablespace decreases.
In the following example, database rate usage is a steady 0.3 GB/s per day.
You might notice spikes in the Free Tablespace chart. At regular intervals, raw data and downsampled data is purged from the NMS database. This reclaims some tablespace. Note that not all attribute data is purged from the NMS database.