Accessing the database using both JDBC and EJB2 CMP can cause data synchronization issues when update and query are performed together within one transaction.
如果同时使用JDBC和EJB2 CMP访问数据库，那么当在一个事务中同时执行更新和查询时会发生数据同步问题。
When update activity is excessive, the ability of cluster replication to maintain database synchronization becomes limited if the server is not sized properly.
如果没有适当地安排服务器的大小，当更新活动比较频繁时，集群复制维护数据库同步的能力就会受到限制。
When the client is online a "that is, when the client has connectivity to the server — database synchronization can be triggered immediately after an update is made to the local database."
当客户机联机时——即客户机已经连接到服务器——在对本地数据库进行更新之后，将立即触发数据库同步。
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