December 2002
Intermediate to advanced
928 pages
85h 29m
English
Content preview from Oracle in a NutshellBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Backup and Recovery Fundamentals
The common Oracle backup and recovery methods can be differentiated in a number of ways, based on the type of backup and recovery available and the steps necessary to recover from a failure. The following list summarizes the concepts and terms that are fundamental to the backup and recovery process.
- Instance/media recovery
An Oracle database can fail in two basic ways: instance failure and media failure. When instance failure occurs, something happens that prevents the processes that make up an Oracle instance from servicing database requests. The Oracle database can automatically recover itself from this type of failure as soon as the instance is restarted, with roll-forward and rollback operations. Because instance recovery is automatic, we don’t cover it in this chapter.
An Oracle database can also experience a media failure. This occurs when the underlying storage for the files used by an Oracle database fails or experiences a corruption. Oracle does not provide automatic recovery from this type of failure, because there may very well be other actions that you need to take before you attempt recovery, such as replacing a failed disk drive. The backup and recovery operations described in the remainder of this chapter are used to address media failure.
- Consistent/inconsistent
An Oracle backup can be either consistent or inconsistent. A consistent backup is a complete backup of an Oracle database that is in a consistent state. A consistent backup ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.