数据一致性是主备用系统必须解决的问题。
Data coherence problem must be solved in the host-standby system.
联锁系统由操作冗余的主备用计算机配置构成。
The interlocking system is composed of an operationally redundant active and standby computer configuration.
当主用数据被更新后，就会产生主备用内存数据的一致性问题。
After the primary data is updated, there will be the coherence problem of memory data between the host and the backup.
该方案又把一主备用站地址库集成进系统之中，从而扩大了该设备的使用范围。
And also, this system design integrates the address storeroom of the main backup station into the whole system, thus enlarging the usable range of the equipment.
随后备用数据将流动到主系统中。
而备用服务器直到从主服务器收到消息，得知它磁盘上具有相同的日志，才写入该日志。
The standby system does not write the log until it hears from the primary that that the same log is on disk there.
备用系统收到日志写后，将确认通知发送到主系统。
Once the standby system receives the log write, it sends acknowledgements to the primary.
DB 2UD b数据库的分割镜像可以被初始化为一个热备用数据库，当主数据库不可用时，可提供一个快速的灾难恢复选项。
A split mirror of a DB2 UDB database can also be initialized as a warm standby database, providing a quick disaster recovery option if the primary database becomes unavailable.
该系统结合单一或主/热备用配置提供ATIS航站广播。
The system provides combined ATIS broadcast in either single or main/hot standby configuration.
要想使用 HADR，必须有两个专用的服务器：一个用于运行主数据库，一个用于备用数据库。
To take advantage of HADR, you must have two dedicated servers available: one for the primary database and one for the standby database.
默认的复制方法(也有其他可用的方法)只要求在将确认通知返回给主系统之前，备用系统的内存中收到一个日志写。
The default replication method (others are available) only requires that a log write be received in memory at the standby before acknowledgement is returned to the primary.
应用程序可移回主系统，但最好等到应用程序首先完成备用系统的积压工作再移动。
Apps can be moved back to the primary, but it is best to wait until the apply program gets through the standby's backlog first.
一个DB 2HADR场景由两个DB 2系统组成，一个是主系统，一个是备用系统。
A DB2 HADR scenario consists of two DB2 systems, a primary and a standby.
这个HADR设置的主数据库名和备用数据库名是jsbmain。
The primary and standby database name for the HADR setup is jsbmain.
这个拓扑结构中的第三个节点(Node3)由远程位置上的灾难恢复站点组成，它托管前面提到的主数据库的备用数据库。
The third node (Node3) in this topology consists of the disaster recovery site existing in a remote location and hosting the standby database for the primary database mentioned earlier.
等到连接恢复时，就可以重新打开HADR，而备用系统将与主系统通信，并执行“catch - up”操作，直到它返回到同步状态。
Once connectivity is restored, you can turn HADR back on and the standby will communicate with the primary and perform "catch-up" operations until it returns to a synchronized state.
它由一对服务器组成—主服务器和HDR备用服务器—并且同时支持异步和同步复制模式。
It consists of a pair of servers - the primary and the HDR secondary - and supports both synchronous and asynchronous replication modes.
两个站点均运行日志捕捉和应用程序，但在这个经过简化的场景中，数据仅进行单向复制，即从主站点复制到备用站点。
Running at both sites are log-capture and apply programs, but in this simplified scenario, data is only replicating one way — from primary to standby.
主服务器的日志写入和对于备用服务器的发送在主服务器上是并行执行的。
The log write at the primary and the send to the standby are performed in parallel on the primary server.
该解决方案将一个额外的DB 2服务器用作备用服务器，它在主服务器出现故障时接管其工作。
This solution involves using an additional DB2 server as a stand-by that can take over operations when the primary has to go down.
该设置决定备用服务器何时将确认发送到主服务器。
This setting determines when the secondary server sends an acknowledgement to the primary server.
首先有一个主冷却系统，然后有一个备用系统，备用系统还有一个备用系统，再有一个备用系统的备用系统，如此下去。
There's the main cooling system, a backup to it, a backup to the backup, a backup to the backup to the backup, and so on.
在通过各种数据库配置参数配置了主备数据库并在备用位置恢复了主数据库之后，您就可以启动hadr函数了。
Once you configured the primary and standby databases through various database configuration parameters and restored the primary database at the standby location, you could start HADR function.
如果主中央管理器出现故障，那么备用的中央管理器就会成为中央管理器。
If the primary central manager fails, the alternate central manager then becomes the central manager.
在同步模式下，只有接收到来自hdr备用服务器的确认，主服务器才会提交事务。
In synchronous mode, transactions on the primary server will not commit until it receives an acknowledgement from the HDR secondary server.
设置了一个故障转移连接，用于将更新的应用程序自动从主站点切换到备用站点。
A fail-over connection is set up for automatic switchover of updating apps from primary to standby.
图5演示了同步主系统和备用系统的HADR过程。
Figure 5 illustrates the HADR processes synchronizing a primary and standby system.
DB 2服务器会自动将日志变更从主服务器传递给备用服务器。
The DB2 server would automatically relay log changes from primary to its stand-by server.
DB 2服务器会自动将日志变更从主服务器传递给备用服务器。
The DB2 server would automatically relay log changes from primary to its stand-by server.
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