Redo and Undo

  • Jonathan Lewis


In a conference session I call “The Beginners’ Guide to Becoming an Oracle Expert,” I usually start by asking the audience which bit of Oracle technology is the most important bit and when did it first appear. The answers I get tend to go through the newer, more exciting features such as ref partitioning, logical standby, or even Exadata, but in my opinion the single most important feature of Oracle is one that first appeared in version 6: the change vector, a mechanism for describing changes to data blocks, the heart of redo and undo.


Data File Data Block Current Block Change Vector Oracle Database 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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© Jonathan Lewis 2011

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  • Jonathan Lewis

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