Middleware creates a flexible system where the underlying RDBM may be seamlessly changed, and additionally allows a single database server to be replaced with a cluster of machines.
中间件创建一个灵活的系统,在这个系统中,底层的RDBM可以无缝地改变,而且允许用集群替换单一的数据库服务器。
Or maybe a cluster — with a dedicated database server with RAID and tape backups for sure, and also a separate machine to run the interface.
或者可能是一个集群——有一个使用了RAID的专用的数据库服务器,以及磁带备份的保证,还有单独的机器来运行界面。
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。
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