Discussion
The strictest transaction isolation level provided by SQL Server is called:
Answer: B
Correct answer: SERIALIZABLE.
Serializable is the strictest of the four, permitting neither dirty reads, nor nonrepeatable reads, nor phantoms, and giving a result equivalent to running the transactions one after another. The cost is the concurrency given up: locks are held on ranges as well as rows, so other transactions are blocked from inserting into them.
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