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Redo log files record all changes made on the database

Used for recovery

Require at least

2 Groups

1 member

Should try and divide up I/O

Try and keep data file and log files on seperat drives.

Min size 50k

Max size OS dependant

Make larger for many changes

You must enable arch in pfile before you can use the archiver. 

LOG_ARCHIVE_DEST_1='location=pathToArchiveFolder'
LOG_ARCHIVE_START=true
 
Then you must shutdown the database and startup in mount mode and run:
ALTER DATABASE ARCHIVELOG;
ALTER DATABASE OPEN;