GemFire企业版5.5在支持“读取提交(Read Committed)”和“未提交读取(Uncommitted Read)”两种读取级别的基础上，又增加了新的对“可重复读取(Repeatable Read)”缓存事务隔离的支持...
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例如，可以每分钟调用一次收集器来读取主机的cpu利用率，或通过JXM接口从事务管理器读取提交事务的总数。
For example, a collector might be invoked every minute to read a host's CPU utilization or read the total number of committed transactions from a transaction manager through a JMX interface.
在读事务中，没有变更需要提交，但是事务会防止对正在被读取的数据的修改，直到所有的读操作全部结束。
In a read transaction, there are no changes to commit, but the transaction prevents the data being read from changing until all of the reads are complete.
现在，读取事务可以访问当前提交的、连贯的行映像(写入事务以不兼容方式锁定)，而不会受到阻塞。
Now, a read transaction can access the currently committed and consistent image of rows that are incompatibly locked by write transactions without being blocked.
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