Nonrepeatable reads occur when a transaction rereads data it has previously read and finds modifications or deletions caused by a committed transaction.

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Nonrepeatable reads occur when data is modified or deleted by a committed transaction after a transaction has previously read the data. This results in the second read of the same data returning different values, which can cause inconsistency in the transaction.

Nonrepeatable Reads Occur When a Transaction Rereads Data It Has