If you delete the Viya namespace then everything stored in persistent volumes would be lost, as those would be deleted with the namespace. This would include the PostgreSQL database if using an internal PostgreSQL instance. If using an external PostgreSQL instance though you would not be able to use your old database and it's content with a deployment of a different version. Any files stored in an NFS mounted path would not be lost. Information on what can be transferred using the export tools (content and full-system migration) can be found here: Migrating from the SAS Viya Platform https://go.documentation.sas.com/doc/en/sasadmincdc/v_043/calmigration/p1hub2gt380pjzn14ysly8mej6ua.htm
... View more