Oracle 18c enable dbhome readonly Tips
Oracle 18c Private Temporary Table Tips
Private Temporary Table is Available from Oracle 18c. A temporary table holds data that exists only for the duration of a transaction or session. Also we cannot create a PTT as SYS and possibly with other privileged accounts.
Private temporary tables are useful for dynamic reporting applications. Memory-based temporary table that is dropped at the end of the session or transaction depending on the setup.
The document is PRIVATE TEMPORARY TABLE