第三台计算机包含集群数据库。
对于每个集群数据库副本，与写磁盘操作相关的网络流量会加倍。
For each cluster database replica, network traffic associated with write disk operations is approximately doubled.
转换数据库厂商或设法集群数据库服务器将意味着完全改变您的前端代码。
Switching database vendors or trying to cluster the database servers would mean changing all your front end code.
假设已在将提供集群数据库的系统上安装了DB2，请按如下方式设置数据库。
Assuming that DB2 has been installed on the system that will serve the cluster database, set up the database as follows.
设置集群数据库名称，例如MYDEDB，单击Delayexecutionofdatabasescripts。
Set the name of the cluster database, such as MYDEDB, and click Delay execution of database scripts. Then click next.
LotusDomino将关于一个特殊集群中的独特nsf文件的信息存储在集群数据库目录(cldbdir . nsf)中；然而，该数据库只在特定集群中是独特的。
Lotus Domino stores information about unique NSF files within a particular cluster in the cluster database directory (cldbdir.nsf); however, this database is unique only within a particular cluster.
使用集群，将只推入并复制那些发生更改的数据库。
With clustering, only those databases that have a change are pushed and replicated.
该解决方案使用与RAID文件服务器相同的技术，允许整个ZEO数据库集群以冗余的方式操作，并且所有服务器都参与读和写。
It USES the same techniques as a RAID file server to allow an entire cluster of ZEO databases to operate redundantly, with all servers participating in both reads and writes.
另外，两个服务器都对数据库使用集群复制。
In addition, both servers used cluster replication for the databases.
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。
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.
默认工作负载集群组在数据库之下。
根据需要配置应用程序集群，以连接到迁移后的生产数据库。
Configure the application cluster to connect to the migrated production database if necessary.
与主节点安装在一起的DB 2数据库自动被集群中所有其他节点使用。
The DB2 database installed with the primary node is automatically used by all other nodes in the cluster.
该数据显示当前已修改并等待集群复制的数据库数量。
This statistic shows the current number of modified databases awaiting cluster replication.
我们假设您打算创建一个包含两个服务器的集群，并且用户和数据库是均匀分布的。
We will assume that you want to create a two-server cluster with users and databases equally distributed.
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 update activity is excessive, the ability of cluster replication to maintain database synchronization becomes limited if the server is not sized properly.
工作负载与真实的客户环境非常接近，包括复制、集群、本地邮件数据库复制、全文索引和事务日志记录等。
The workload is much closer to a true customer's environment that includes replication, clustering, local mail database replication, full text indexing, transaction logging, and so on.
确保在集群中均匀地分布数据库。
Make sure that you distribute databases evenly in the cluster.
将消息传递引擎集群添加到总线，并将数据库模式设置为正确值。
Add the messaging engine cluster to the bus and set the database schema to the correct value.
尽管软件可以使用很多工具和向导来组建服务器集群，但专家数据库管理员(DataBase Administrator,DBA)可以帮助处理各种意外问题。
Although many tools and wizards are available with the software to cluster servers, an expert database administrator (DBA) can help with unexpected problems.
InformixFlexibleGrid可以跨多个集群快速轻松地更新数据库模式，从而更快地响应业务需求变化。
Informix Flexible Grid offers fast and easy updates to database schemas across multiple clusters for faster response to business needs.
要了解如何在集群中分布数据库，请查看“使用Domino集群实现负载平衡”中提供的一个例子。
For an example of how to distribute databases in a cluster, see "Workload balancing with Domino clusters."
其他集群解决方案，比如MicrosoftClusters (Wolfpack)，也提供数据库故障转移，但其转移目标是使用数据库的单个实例的集群成员。
Other clustering solutions, such as Microsoft Clusters (Wolfpack), provide failover of databases to other cluster members using only a single instance of the database.
因此，集群总共包含了9 个数据库分区。
So the cluster contains a total of nine database partitions.
例如，基于mysql集群的数据库层可能包含两个服务器组，一个ndbd组和一个manager组。
For example, a mysql-cluster-based database tier would be comprised of two server groups, an NDBD group and a manager group.
尝试使用集群（数据库）
如上所述，将应用程序数据保存在中央数据库中可以确保在集群环境中写入和一致地读取数据。
As mentioned above, keeping the application data in a central database ensures consistent server write and consistent read data in the cluster environment.
您可以为运行在集群中的应用程序选择数据库会话持久化或内存到内存的会话复制。
You can choose from database session persistence or memory-to-memory session replication for applications running in a cluster.
将数据库分布到各个集群成员是实现集群工作负载平衡的最好方法之一。然而，要恰当地分布数据库可能需要大量时间。
Distributing databases among cluster members can be one of the best ways to balance the cluster workload, however, it can be very time consuming to properly distribute the databases.
最常见的分区环境由每个物理系统上的一个数据库分区组成，这些物理系统组成数据库分区集群。
The most common partitioned environment consists of a single database partition on each physical system that makes up the database partition cluster.
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