1.

________ allows only committed data to be read and further requires that no other transaction is allowed to update it between two reads of a data item by a transaction.(a) Read uncommitted(b) Serializable(c) Repeatable read(d) Read committedI had been asked this question during an online interview.I would like to ask this question from Transaction Isolation Levels in section Transactions of RDBMS

Answer»

Correct option is (c) REPEATABLE read

Easy explanation: Repeatable read allows only committed data to be read and further requires that no other transaction is allowed to update it between TWO reads of a data item by a transaction. HOWEVER, the transaction may not be serializable with respect to other TRANSACTIONS.



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