database backup
"Database backup is like a second life for the database. It plays an important role in-case any disaster or failure occurs on the database. Restoring a corrupt or damaged database without a clean backup is like nightmare situation for database administrator but it's possible. You can repair and restore corrupt oracle database with the help of third party oracle database recovery utility."
"the colder it is, the less time you want to spend doing it."
A nice discussion of doing database backups when the system is off line and when it is on-line.
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