改变表的锁定粒度。
在实现具有高并发性要求的系统时，我们可以基于操作的要求采用更细粒度的锁定策略，从而减少资源争用。
In implementing systems with high concurrency requirements we can devise finer grained locking strategies based on the access requirements of the operations, hence reducing contention for resources.
例如，在财务系统中的客户级别上：一个粗粒度锁会锁定该客户的所有帐户，另一个锁则可锁定全部保险策略。
An example might be at the customer level in a financial system: one coarse grained lock could be to lock all accounts for the customer, another could be to lock all insurance policies.
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