但是请求锁的动作将会触发一系列的动作，这可能导致严重的系统开销，这是不可避免的。
Yet the act of asking for a lock will trigger a sequence of actions that can result in accumulation of significant overheads, one that cannot be avoided.
如果Hibernate不是独占数据库用户，乐观锁会失效，除非创建数据库触发器为其他应用程序对相同数据的变更增加版本字段值。
Optimistic locking will not work if Hibernate is not the sole database user, unless you create database triggers to increment the version column for the same data change by other applications.
存在锁争用时，POSIX锁定和解锁操作将触发Linux内核优先级继承支持。
With contention, a POSIX lock and unlock operation would trigger Linux kernel priority inheritance support to occur.
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