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Define two-phase locking protocol.
Ans: Two-phase locking is significance in the context of ensuring that schedules are serializable. The two-phase locking protocol defines a process each transaction follows.
The two-phase locking protocol
1. Previous to operating on any row, a transaction must obtain a lock on that row.
2. After releasing a lock, a transaction should never obtain any more locks.
You group has been hired by TrainingrUs.com to keeps track of training revenues. TrainingrUS.com wants you to keep scheduling. COURSE table contains following information:
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