Conversely, a higher isolation level reduces the types of concurrency effects that users may encounter, but requires more system resources and increases the chances that one transaction will block another.

• 相反,较高的隔离级别减少了用户可能遇到的并发副作用的类型,但需要更多的系统资源,并增加了一个事务阻塞其他事务的可能性。