Last Successful login time: Sat Apr 15 2023 17:03:04 -04:00 Connected to: Oracle Database 23c Free, Release 23.0.0.0.0 - Developer-Release Version 23.2.0.0.0 SQL> alter database datafile 15 resize 16G; alter database datafile 15 resize 16G * ERROR at line 1: ORA-12954: The request...