Oracle

Archive log

how to setup:

http://www.beyondoracle.com/2008/05/08/setup-oracle-database-archivelog-mode/

sql plus:

shutdown immediate;
startup mount;
alter database archivelog;
alter database open;

examine:

archive log list;
select log_mode from v$database;

/sqlplus help

Quick tour http://docs.oracle.com/cd/B19306_01/text.102/b14217/quicktour.htm