You
must test every phase of the backup-and-recovery process to ensure that the entire
process works, because once a disaster hits, the complete recovery process must
work flawlessly.
Some companies test the backup procedure but fail to actually test recovery using the
backups taken. Only when a failure requires the use of the backups do companies
discover that the backups in place were unusable for some reason. It??™s critical to test
the entire cycle from backup through restore and recovery.
Taking Oracle Backups
Two basic types of backups are available with Oracle:
Hot backup
The datafiles for one or more tablespaces are backed up while the database is
active.
Cold backup
The database is shut down and all the datafiles, redo log files, and control files
are backed up.
With a hot backup, not all of the datafiles must be backed up at once. For instance,
you may want to back up a different group of datafiles each night. You must be sure
to keep backups of the archived redo logs that date back to your oldest backed-up
datafile, since you??™ll need them if you have to implement rollforward recovery from
the time of that oldest datafile backup.
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