When we run data purges in a namespace, the size and space of the DB does not change. I assume like Oracle it leaves white space that is usable by cache, but is there a way to see how much of this space is available? Today I increased the size of the disk available to the system as we were reaching critical low disk space, however, with the purges, we should have several hundred GB of available space inside the database to use. And is it safe to allow the system to run out of available disk space, as long as there is enough free space in the DB for writing data?