July 2006
Intermediate to advanced
560 pages
12h 57m
English
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Undo Tablespaces
Transactions can complete either with a commit or a rollback. A typical transaction ends with a commit, which permanently records the transaction's changes to the database. A rollback undoes all effects of the transaction, as though the transaction never occurred. To provide for transaction rollback, Oracle must keep track of the data that a transaction changes until the transaction commits or rolls back.
Oracle uses a special type of tablespace called an undo tablespace to record rollback data for all transactions. Should you choose to roll back a transaction, Oracle reads the necessary data from the database's undo tablespace to rebuild the data as it existed before the transaction changed it.
Undo Segments
To distribute the ...
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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.