Standard SQL defines four ________,which specify which of the concurrency control problems are allowed to occur.
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Q23: Which type of lock assumes that no
Q24: What are the four transaction isolation levels?
Q25: What is the least restrictive isolation level
Q27: What is the least restrictive isolation level
Q29: Only large database systems have a need
Q31: With optimistic locking,locks are first issued,then the
Q32: One advantage of optimistic locking is that
Q33: Breaking hardware,power outages,and human mistakes are all
Q81: Distinguish between statement-level consistency and transaction-level consistency.
Q83: Explain the process of using optimistic locking.
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