The error "ORA-28000: the account is locked" keeps happening often.

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This error occurs when the user account has been locked due to multiple unsuccessful login attempts. To resolve this issue, you will need to unlock the user account using an administrative account or resetting the password for the locked account. You can also modify the security settings to allow more login attempts before locking out the account. Additionally, you can investigate the cause of the failed login attempts and take appropriate measures to prevent future occurrences.