Oracle X6-2-HA Deployment And User's Manual page 143

Console or the command-line. A level 0 backup is a full backup and is used as the
parent for a level 1 backup.
• Level 1: The backup is an incremental backup that captures only those blocks that
change between backups in each datafile. By default, a level 1 backup occurs
daily, Monday through Saturday, and captures images of each block in a datafile
that changed. Level 1 backups are differential backups. The backup includes
blocks from the most recent previous level 1 or level 0 backup.
• LongTerm: The backup is a long-term, or archival backup. Use LongTerm to
create a backup that is all-inclusive and exempt from the backup retention policy.
The backup is all-inclusive because every file needed to restore and recover the
database is backed up to a single location. The backup is exempt from the
retention policy that is defined in the recovery window. For long term backups, you
must use non-FRA locations for backup destinations using the backup policy
options.
• Archivelog: This is a backup of all archivelogs not yet backed up to the backup
destination, such as Internal FRA, External FRA (NFS location), or Object Store.
The AutoScheduler creates a level 0 backup on Level 0 Backup Day, by default, on
Sunday, and level 1 on the remaining days of the week. You can display a list of
scheduled backups, edit your backup schedule, or disable a scheduled backup.
Backup to Disk
When you backup to disk, you are using the Oracle Fast Recovery Area (FRA) of the
disk. FRA is a storage directory that allows backup and recovery operations on Oracle
databases. The directory contains archived redo logs, backup pieces and copies, and
the control file.
Advantages to backing up to disk are as follows:
• Quick recovery from backups stored on disk
• Ability to PITR restore the database
• Automate management of recovery related files (like archived logs)
Note:
When you backup to disk, data is not encrypted and passwords are not
allowed. In addition, backup to disk requires a lot of disk space (up to two to
three times the size of the database).
The following is a high-level overview of the workflow for backup and recovery when
using a disk:
Create a backup policy to define the backup location (disk), backup level, and
1.
recovery window.
Create a database and attach the backup policy to the database. When the
2.
backup policy is associated with a database, backups are automatically created.
Manage obsolete backups.
3.
Recover the database from a backup on the disk.
4.
About Database Backup and Recovery Options
Chapter 11
11-3