The command ALTER DATABASE FLASHBACK ON; enables the Flashback Database feature, which

provides a way to quickly revert an entire Oracle database back to a previous point in time. This

command can be executed while an Oracle 19c primary database is either open (option A) or

mounted (option B). It is also applicable to an Oracle 19c logical standby database while SQL Apply is

active (option E). However, it's important to note that enabling Flashback Database on the primary

does not automatically enable it on all associated standby databases, whether they are physical or

logical. Each database in a Data Guard configuration must have Flashback Database explicitly enabled

if desired. Real Time Query being active on a physical standby does not directly relate to the ability to

execute this command on the standby. Reference: The explanation is based on Oracle's concepts for

Flashback Technology and Data Guard configurations as detailed in the Oracle Database Backup and

Recovery User's Guide and the Oracle Data Guard Concepts and Administration guide.