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

• 相反,较高的隔离级别会减少用户可能遭遇的并发影响的类型,但是需要更多的系统资源,并且提高了一个事务阻止其他事务的可能性。