数据库镜像

数据库镜像XMLSCHEMA模式的应用研究

Research on Database Mirroring Application of XML Schema Mode

与数据库镜像一样，日志传送是数据库级操作。

Like database mirroring , log shipping operates at the database level .

DistributedReplicatedBlockDevice（DRBD）提供一个网络版的数据库镜像，属于冗余磁盘阵列（RAID）RAID-1类。

The Distributed Replicated Block Device ( DRBD ) provides a networked version of data mirroring , classified under the redundant array of independent disks ( RAID ) taxonomy as RAID-1 .

首先受控于开发人员领导的数据库镜像站点（打开状态），然后当任务处于激活状态时，受控于QE领导的站点。

Is first mastered at the Developer Lead 's database replica site ( in the Opened state ) and is then mastered at the QE Lead 's site when the Task is in the Activated state .

这报告与数据库镜像传输安全性相关的审核消息。

This reports audit messages related to database mirroring transport security .

复制是否可与日志传送和数据库镜像一起进行？

Does replication work in conjunction with log shipping and database mirroring ?

日志传送可以用于补充或替代数据库镜像。

Log shipping can be a supplement or an alternative to database mirroring .

不过，可以像使用日志传送一样使用数据库镜像。

However , you can use database mirroring much like you use log shipping .

设置数据库镜像选项除外。

The exception is setting database mirroring options .

有关感兴趣的日志传送替代方法，请参阅下面的数据库镜像部分。

Check out the database mirroring section below for an interesting alternative to log shipping .

为数据库镜像准备数据库。

Prepare databases for database mirroring .

在该日志填满之前恢复数据库镜像会话，或添加更多的日志空间。

Resume the database mirroring session before the log fills up , or add more log space .

只要数据库镜像会话保持暂停状态，事务日志就不会被截断。

As long as a database mirroring session remains paused , the transaction log cannot be truncated .

为了检测可能未被注意的其他故障，数据库镜像采用了自己的超时机制。

To detect other failures that would otherwise go unnoticed , database mirroring implements its own time-out mechanism .

更新了“限制”部分以说明数据库镜像不支持跨数据库事务和分布式事务。

Updated the " restrictions " section to state that cross-database transactions and distributed transactions are unsupported by database mirroring .

建议您对数据库镜像连接进行加密，除非您能够保证网络的安全。

Unless you can guarantee that your network is secure , we recommend that you use encryption for database mirroring connections .

返回当前更新周期，即数据库镜像状态表的更新间隔分钟数。

Returns the current update period , that is , the number of minutes between updates of database mirroring status table .

这些超时设置独立于数据库镜像，数据库镜像不了解它们，并且完全不能识别其行为。

Such time-outs are independent of database mirroring , which has no knowledge of them and is completely unaware of their behavior .

通常，组合使用日志传送和数据库镜像时，会先建立镜像会话，然后再建立日志传送（尽管这并不是必需的）。

Typically , when combining log shipping and database mirroring , the mirroring session is established before log shipping , although this is not required .

在数据库镜像会话期间，连接到主体服务器实例，然后在对象资源管理器中，单击服务器名称以展开服务器树。

During a database mirroring session , connect to the principal server instance , in object explorer , click the server name to expand the server tree .

对于难以解释的数据库镜像设置问题，建议检查每个服务器实例以查看它们是否正在侦听正确的端口。

For database mirroring setup issues that are difficult to explain , we recommend checking each server instance to determine whether it is listening on the correct ports .

当数据库镜像会话处于暂停时，当前所有日志记录都保持为活动状态，因为主体服务器正等待将这些记录发送到镜像服务器。

While a database mirroring session remains paused , all of the current log records remain active because the principal server is waiting to send them to the mirror server .

若要在给定的服务器实例上启用数据库镜像的证书验证，系统管理员必须配置每个服务器实例，以在出站连接和进站连接中使用证书。

To enable certificate authentication for database mirroring on a given server instance , the system administrator must configure each server instance to use certificates on both outbound and inbound connections .

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 .

数据库的镜像副本不可用。

The mirror copy of the database is not available .

以前的主体角色成为镜像角色，以前的主体数据库成为镜像数据库。

The former principal takes on the mirror role , and the former principal database becomes the mirror database .

但是，理想情况下，包含主体数据库和镜像数据库的合作伙伴服务器应驻留在两台不同的计算机上。

The partner servers containing the principal and mirror databases ideally should reside on two different computers , however .

作为全球土地覆盖数据库的镜像站点，需要通过互联网发布一批TM/ETM影像，方便国内用户使用；

As a mirror site of global land cover facility , there is a set of data to be published through internet for domestic users .

该机制可广泛应用于Internet分布式文件系统、分布式数据库、WEB镜像服务器以及分布式软件分发、群集服务器等应用中。

The mechanism can be widely appled in Internet distributed file system , distributed database and WEB server synchronization of Internet etc.

确保镜像数据库已为镜像做好准备。

Make sure that the mirror database is ready for mirroring .