________ allows only committed data to be read, but does not require repeatable reads
(a) Read uncommitted
(b) Serializable
(c) Repeatable read
(d) Read committed
(a) Read uncommitted
(b) Serializable
(c) Repeatable read
(d) Read committed
Right answer is (d) Read committed
The explanation: Read committed allows only committed data to be read, but does not require repeatable reads. For instance, between two reads of a data item by the transaction, another transaction may have updated the data item and committed.