Oracle Database Discussions

Hi, I setup lightweight clones on a Oracle 12.2 with dbms_dnfs.clonedb_renamefile(), like described eg. at

• https://ronekins.com/2019/12/23/oracle-database-cloning-magic-with-dnfs-and-clonedb/
• https://www.carajandb.com/en/blog/2013/clonedb-quick-n-easy/,
• https://oracle-base.com/articles/11g/clonedb-11gr2.

The clone DB instances work very well - until I shutdown the clone DB. When I startup again, the changes done on the clone are gone, i.e. I'm back with the state when the clone was created.

We have this problem on two systems setup independently (one with Centos 7.4 setup years ago, the other with Oracle Linux 7.9, setup recently using this description: https://oracle-base.com/articles/11g/clonedb-11gr2).

Any idea how I can analyze the situation? What I did already is validating datafiles with RMAN.