"database "example" is being accessed by other users" solution

Action
postgres=# drop database example;

Error
ERROR:  database "example" is being accessed by other users
DETAIL:  There is 1 other session using the database.

Solution
Run following sql code;

postgres=# 
SELECT pg_terminate_backend(pg_stat_activity.pid) FROM pg_stat_activity WHERE pg_stat_activity.datname = 'example' AND pid <> pg_backend_pid();

All sessions should be terminated where belong to "example" database except backend sessions.

Lastly, try to drop it again.

How to backup database in XE?

It is very simple to backup your database in Oracle XE with already prepared .bat file quickly.

Steps;
Press Windows Key -> Type "Backup Database" -> Click "Backup Database" link -> .bat file "Backup.bat" runs -> Follow the steps -> Done

Finally, check the backup path;
...\oracle\fast_recovery_area\XE