在主系统上，用以下命令执行0级存档。
On the primary system, perform a level-0 archive with the following command.
随后备用数据将流动到主系统中。
而异步可用性则不保证主系统和辅助系统是完全同步的。
Asynchronous availability does not guarantee that primary and secondary system databases are completely synchronized.
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.
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.
在故障转移过程中，数据源从主系统移动到辅助系统。
In the failover process, the data source is moved from the primary to the secondary system.
例如，MDM系统是主系统，而事务性系统是从系统。
So for example, it could be that the MDM system is the master and the transactional systems are the slave systems.
只要使用下面这个命令在主系统中停止heartbeat即可。
You can do this simply by stopping heartbeat on the primary system, using this command.
在主系统上，用以下命令备份逻辑日志：ontape- a。
On the primary system, back-up logical logs with the following command: ontape -a.
这些障碍是完整的吗，覆盖层，主系统，次级系统，容器。
Are the barriers intact? Clad, primary systems, secondary, containment.
当检测到故障时，存储的所有关系从主系统转移到辅助系统。
When a failure is detected, ownership of the storage is moved from the primary system to the secondary system.
如果主系统主机发生错误，虚拟ip地址就切换到备用机上。
In the event of a failure on the primary host, this virtual IP address fails over to the standby.
主系统执行所有事务性工作，并将任何数据库更改复制到备用系统。
The primary system performs all transactional work and replicates any database changes to the standby.
客户端使用一个虚拟ip地址，通过公共网络连接到主系统数据库。
The client connects to the primary database using the public network using a virtual IP address.
当主系统上备份的逻辑日志可用时，可以将它们恢复到辅助系统上。
Logical logs backed up on the primary system can be restored on the secondary system as they become available.
如果要创建的辅助系统与主系统的路径设置不同，这种方法非常有用。
This would be useful if creating a secondary system that has a different set of paths associated with it than the primary.
heartbeat总是优先选择主系统，只要有可能，就先从那里开始运行。
Heartbeat will always give preference to the primary system and will start to run there if possible.
我们将假设每当向客户机交付数据包时，必须向主系统发送一条消息来确认交付。
We will assume that whenever a package has been delivered to a client, a message must be sent to the main system to confirm the delivery.
当主系统出故障时，连续日志恢复特性使一个辅助系统可用，以替代主系统。
In case the primary system fails, the continuous log restore feature makes a secondary system available to replace the primary system.
该确认消息异步传送，也就是，没有需要的响应，此消息简单地排列到主系统中用于处理。
This confirmation message is sent asynchronously, that is, no response is required and the message is simply queued to the main system for processing.
系统配置支持故障转移和灾难恢复，而主系统和备份系统可以放置在距离很远的两个位置。
System configurations support failover and disaster recovery, as primary and backup systems may be separated by many miles.
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.
所有的主板都包括了一小块的只读存储器rom，它与用于载入和运行软件的主系统内存分离。
All motherboards include a small piece of Read Only memory (ROM) which is separate from the main system memory used for loading and running software.
在复制了滞留的数据之后，即可在主系统上启动应用程序，将备用数据发送到主系统。
When the stranded data is replicated, the standby data can be sent to the primary by starting the apply program on the primary system.
典型示例是灾难恢复测试，其中涉及故障转移到热备用系统、测试应用程序，然后退回到主系统。
The classic example is a disaster recovery test, which involves failing over to a warm standby system, testing the applications, and then failing back to the primary systems.
进程的核心是loop函数，MochiWe b主系统每次接收到一条请求时都会调用此函数。
The core of the process is the loop function that is called each time a request is received by the main MochiWeb system.
它们的目标是清理主系统的水，提供分离的停止，冷却的功能，水化学，装料及容量控制，补充水。
They are aimed at either cleaning the water in the primary system, providing separate shutdown cooling functions, water chemistry, charging and volume control, makeup water.
蓄电池是一个被动的系统，只会在主系统出现了重大的，压力损失的情况下才会自动运行。
And the accumulator is a passive system that just operates automatically based on a significant loss of pressure in the primary system.
引用MDM解决方案模式：这种主数据系统设置意味着应用程序系统仍然是记录的主系统。
Referential MDM solution pattern: This setup of a master data system implies that the application systems are still the master systems of record.
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