Why 'ora-28000: the account is locked' appears?

It indicates that the user account you are trying to log in with has been locked, likely due to multiple failed login attempts.

Example:

ORA-28000: the account is locked

Solution:

1. An administrator needs to unlock the user account.
2. It may be set to auto-unlock after a certain period.
3. Ensure you're using correct credentials to avoid multiple failed attempts.