Transactions and Concurrency Control

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Question 1 of 15

Which of the following scenarios may leaves the transaction vulnerable to dirty reads, phantom reads etc.. in a database system?

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A transaction writes a data item after it is read by an uncommitted transaction.

A transaction reads a data item after it is read by an uncommitted transaction.

A transaction reads a data item after it is written by a committed transaction.

A transaction reads a data item after it is written by an uncommitted transaction.

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