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Flash Recovery Area

Noarchive log mode

If the database is in noarchive log mode, online redo logs can (and will) be overwritten without making sure they are saved. This implies that a database cannot be recovered even if backups were made.

Archive log mode

If the database is in log archive mode, the database makes sure that online redo logs are not overwritten before they have been archived.

Turn on archivelog mode

Show status

archive log list;
select log_mode from v$database;
show parameter recover

Alter database

Set Online redo logs, Archived redo logs, Flashback logs

alter system set db_recovery_file_dest_size=2G scope=both;
alter system set db_recovery_file_dest='D:\archivelog' scope=both;
shutdown immediate;
startup mount
alter database archivelog;
alter database open;
alter system archive log start;


oracle/archivemode.txt · Last modified: 2016/03/16 21:16 by Jan Forman