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Which of the following is the highest isolation level in transaction management?
Correct Answer: A
Question 275 Explanation:
→Transactions specify an isolation level that defines the degree to which one transaction must be isolated from resource or data modifications made by other transactions.
→Isolation levels are described in terms of which concurrency side effects, such as dirty reads or phantom reads, are allowed.
→The highest isolation level, serializable, guarantees that a transaction will retrieve exactly the same data every time it repeats a read operation, but it does this by performing a level of locking that is likely to impact other users in multi-user systems.
→Isolation levels are described in terms of which concurrency side effects, such as dirty reads or phantom reads, are allowed.
→The highest isolation level, serializable, guarantees that a transaction will retrieve exactly the same data every time it repeats a read operation, but it does this by performing a level of locking that is likely to impact other users in multi-user systems.
Serializable
Repeated Read
Committed Read
Uncommitted Read