Alter user to lock or unlock the account
SQL> create user oracle_admin identified by oracle_admin;
User created.
SQL>
SQL> grant create session, dba to oracle_admin;
Grant succeeded.
SQL>
SQL> alter user oracle_admin account lock;
User altered.
SQL>
SQL> alter user oracle_admin account unlock;
User altered.
SQL>
SQL> -- connect oracle_admin/oracle_admin;
SQL>
SQL> DROP USER oracle_admin;
User dropped.
SQL>
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