接下来，为应用程序创建并指定一个镜像数据库。
Next we create and specify a mirror database for our application.
为了设置镜像数据库，必须在源系统上执行以下动作。
Here are the actions required on the source system to set up the mirror database.
镜像数据库是实施改进同步请求吞吐量能力的操作所必需的。
The mirror database is required for staging operations to improve the throughput capacity of synchronization requests.
镜像数据库也可用于解决由于从多台客户机进行访问而产生的任何冲突问题。
The mirror database can also be used to resolve any conflicts that arise because of access from multiple clients.
在数据库镜像会话中无法检测到数据库(除镜像数据库之外)故障。
Failures in databases other than the mirrored database are not detectable in a database mirroring session.
分割镜像数据库的活动日志目录不能包含任何不属于分割镜像的日志文件。
The active log directory of the split mirror database must not contain any log file that is not a part of the split mirror.
若要启用镜像数据库的主密钥自动解密功能，必须向镜像服务器实例提供用于加密主密钥的密码。
To enable automatic decryption of the database master key of a mirror database, you must provide the password used to encrypt the master key to the mirror server instance.
通过数据库镜像，减少了源数据库负载。(设备将对复制的镜像数据库进行同步，而不是直接对源数据库进行同步。)
It reduces the load on the source database through database mirroring (devices synchronize against a replicated mirror database instead of against the source database directly).
如果打算将镜像初始化为备用数据库或镜像数据库，那么在分割镜像之前，必须将数据库配置参数LOGRETAIN设置为RECOVERY。
The database configuration parameter LOGRETAIN must be set to RECOVERY prior to splitting the mirror if it is intended to be initialized as standby or mirror database.
它只是作为一个单一的连接点来使用，以便向应用程序提供统一的或单一的数据库镜像。
It will simply serve as a single connection point to deliver the unified or single database image to the application.
因此，数据库历史数据存储在一个ASCII文件中，并放在备份镜像中，我们可以从中检索和处理它。
Therefore, the database history is stored in an ASCII file and included in the backup image where we can retrieve and process it.
日志文件的路径只能包括在用于克隆数据库的分割镜像中。
The path to log files should only be included in the split mirror for clone database.
最后，数据库和表空间的在线备份镜像将包括一组日志文件，在将备份镜像恢复到某个一致的时间点时，这些文件是必需的。
Finally, online backup images of databases and table Spaces will include the set of log files necessary to restore and recover the backup image to a consistent point in time.
在分区环境中，在使用数据库之前，必须初始化每个镜像分区。
In a partitioned environment each mirror partition must be initialized before using the database.
装配数据库目录的分割镜像拷贝。
不在数据库目录中的所有表空间容器都必需属于分割镜像。
All tablespace containers that are not part of the database directory must be part of the split mirror.
管理员可以定义一个单独的虚拟数据库镜像，为程序员提供对不同数据的透明的访问。
Instead, administrators define a single virtual database image to provide programmers with transparent access to diverse data.
当主站点恢复在线后，必须逆转磁盘镜像的方向以便主站点可再次成为用来处理的数据库。
When the primary site comes back online, the disk-mirroring direction must be reversed for the primary site to once again become the database used for processing.
请务必记住，分割镜像必须一直处于写暂挂状态，直到在源数据库上对其进行了复制。
It is important to note that the split mirror must remain in the write suspended state until it is copied on top of the source database.
因此，在使用DB 2UD b数据库的分割镜像之前，必须将其初始化。
Therefore, the split mirror of a DB2 UDB database must be initialized before it can be used.
在源数据库上复制分割镜像。
因此强制使用数据库配置参数MIRRORLOGPATH来镜像活动日志。
It is therefore imperative to use the database configuration parameter MIRRORLOGPATH to mirror the active log.
仅仅使用在线/离线备份镜像，可以将数据库恢复到采取备份时所处的状态。
Using just the online/offline backup images makes it possible to restore a database to the state it was in when the backup was taken.
举例来说，当任务处于打开状态时，默认的开发人员领导是任务的所有者，记录受控于开发人员领导的数据库镜像站点。
For example, when a Task is in an Opened state, the default Developer Lead is the owner of the Task, and the record is mastered at the Dev Lead's database replica site.
在源数据库上初始化镜像拷贝。
将分割镜像用作克隆数据库。
为了使用分割镜像作为一个克隆数据库，必须在目标系统上执行以下步骤。
Here are the steps required on the target system to use a split mirror as a clone database.
而使用db2inidb命令初始化分割镜像时也是如此，在使用数据库之前，必须在每个镜像分区上运行该命令。
The same applies when initializing the split mirror using the db2inidb command, which must be run on each mirrored partition before using the database.
为了使用分割镜像作为备用数据库，必须在目标系统上执行以下步骤。
Here are the steps required on the target system to use a split mirror as a standby database.
清单5：使用备份镜像克隆salesdb数据库。
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