Hibernate控制的事务(ACID,atomicity consistency isolation durability) 1，读未提交的数据（Read uncommitted isolation） 2，读已提交的数据（Read committed isolation） ..
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将分割镜像初始化为快照时，将执行崩溃恢复，回滚所有未提交的事务，并使数据库可以被所有读或写操作访问。
The initialization of the split mirror as snapshot performs a crash recovery, rolls back all uncommitted transactions, and makes the database available for any read or write operation.
例如，如果一个成员正在更新一行数据，那么另一个成员就不能以未提交读(uncommitted read)以外的任何隔离级别读取这一行。
For example, if one member is updating a row, it would not be proper for another member to read the row with any other isolation level than uncommitted read.
脏读：A 1检索a 2未提交的数据。
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