Oracle::How to treat “redo log” on oracle database. . .

The question here is how are the Oracle log files maintained, and what information do we have?
A couple of interesting Oracle views:
a)To view information on log files:

SELECT * FROM v$log;

b)To view information on log file history:

SELECT thread#, first_change#, TO_CHAR(first_time,’MM-DD-YY HH12:MIPM’),next_change# FROM v$log_history;

Operations on Oracle log files :

1. Forcing log file switches:

ALTER SYSTEM switch logfile;

or

  ALTER SYSTEM checkpoint;

2. Clear A Log File If It Has Become Corrupt:

ALTER DATABASE CLEAR LOGFILE GROUP group_number;

3. This statement overcomes two situations where dropping redo logs is not possible: If there are only two log groups and if the corrupt redo log file belongs to the current group:

ALTER DATABASE CLEAR LOGFILE GROUP 4;

4. Clear A Log File If It Has Become Corrupt And Avoid Archiving:

  ALTER DATABASE CLEAR UNARCHIVED LOGFILE GROUP group_number;

5. Use this version of clearing a log file if the corrupt log file has not been archived:

ALTER DATABASE CLEAR UNARCHIVED LOGFILE GROUP 3;

6. Privileges Related To Managing Log Files:

    ALTER DATABASE
   ALTER SYSTEM

7. Init File Parameters Related To Log Files:
log_checkpoint_timeout … set to 0
8. Managing Log File Members:

  ALTER DATABASE  ADD LOGFILE MEMBER ‘log_member_path_and_name’ TO GROUP group_number;

9. Adding log file group members:

ALTER DATABASE ADD LOGFILE MEMBER ‘/oracle/dbs/log2b.rdo’ TO GROUP 2;

10. Droping log file group members:

ALTER DATABASE DROP LOGFILE MEMBER log_member_path_and_name’;
ALTER DATABASE DROP LOGFILE MEMBER ‘/oracle/dbs/log3c.rdo’;

11. To create a new group of online redo log files, use the SQL statement ALTER DATABASE with the ADD LOGFILE clause:
The following statement adds a new group of redo Oracle log files to the database:

ALTER DATABASE ADD LOGFILE (‘/oracle/dbs/log1c.rdo’, ‘/ oracle/dbs/log2c.rdo’) SIZE 500K;