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Question: what are phantom rows?

Answer: If you have already read a range of data based upon a key value, another transaction inserts a new row which happens to have a value between this range. The original range which was referred to would now become invalid. This is because a ?Phantom row? was added.



Category Oracle Interview Questions & Answers - Exam Mode / Learning Mode
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Question: what are phantom rows?
Answer:

If you have already read a range of data based upon a key value, another transaction inserts a new row which happens to have a value between this range. The original range which was referred to would now become invalid. This is because a ?Phantom row? was added. Source: CoolInterview.com

Answered by: somen | Date: 11/3/2009 | Contact somen Contact somen

can u give an example???? Source: CoolInterview.com

Answered by: premangshu dey | Date: 9/5/2010 | Contact premangshu dey Contact premangshu dey


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