该方法支持多粒度锁、自动加锁特性和自动锁粒度升级特性。
This method supports multiple granularity lock, automatic lock and automatic lock escalation.
并且由于每一行都被存储在固定的位置，使得锁升级这样的技术得以实现，以避免过多细粒度锁。
And the location of every row is in a fixed location, allowing for techniques such as lock escalation when too many fine-grained locks would otherwise be needed.
锁升级是将许多较细粒度的锁转换成数量更少的较粗粒度的锁的过程，这样可以减少系统开销，但却增加了并发争用的可能性。
Lock escalation is the process of converting many fine-grain locks into fewer coarse-grain locks, reducing system overhead while increasing the probability of concurrency contention.
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