Discussion
Which of the following occurs when a transaction rereads data it has previously read and finds modification or deletions caused by a committed transaction?
Answer: A
Correct answer: Nonrepeatable read
A non-repeatable read occurs when a transaction reads a row, another transaction modifies or deletes it and commits, and the first transaction reads it again and sees something different. The remedy is the repeatable-read isolation level, which holds read locks to the end of the transaction.
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