否则，它仅在内存中存储POST数据的一个副本，而这没有必要。
Otherwise, it's just storing in memory a duplicate copy of the POST data, which isn't needed.
虽然你的个人电脑只能保存一个文件的一个副本，但像Facebook 这样的大型服务项目，则会依赖于所谓的内容分发网络来管理数据和分发。
While your personal computer only keeps one copy of a file, large-scale services like Facebook rely on what are called content delivery networks to manage data and distribution.
然后，每个数据分区在同一时间通过流程的一个副本运行。
Then, each partition of data is run through a copy of the same process at the same time.
由于文件传输是一种标准技术，这里不作过多介绍，您只需了解客户机将下载清单1中服务配置数据的一个文件副本。
Because file transfer is standard technology, I won't go into detail except to say that the client downloads a file copy of the service profile data in Listing 1.
那个学生曾因为一个实验向鲁杰罗索要原始数据的副本，但鲁杰罗拒绝了。
The student had asked Ruggiero for a copy of the original data for a certain experiment, and Ruggiero had refused.
对主要服务器的任何更新会立即复制到辅助服务器，以维护一个活动数据副本。
Any update made on this primary server is immediately replicated to the secondary server so as to maintain a copy of the active data.
复制是一个异步的过程，不能保证故障转移期间两个副本之间所有数据都是一致的。
Replication is an asynchronous process and can not guarantee during a failover that all data is consistent between copies.
如果您能够进行自动故障转移，请设想一下，如果另一个数据中心使用日志的副本启动，会怎么样呢。
If you have some kind of automatic failover, imagine what would happen if the second data center started using the copy of the logs.
更新事务首先根据一个XQuery谓词读取一个特定文档，然后使用它更新数据库中这个文档的原副本。
Update transactions first read a specific document based on an XQuery predicate, and then use it to update the original copy of that document in the database.
这意味着数据的两个副本都可用：集群的每一半各一个。
This means two copies of the data are available: one in each half of the cluster.
在使用LDAP目录时，一种非常常见的配置是使用一个主 LDAP服务器和另外几个 LDAP 副本服务器，这种配置可以实现目录数据的负载平衡和高可用性。
When using the LDAP directory, it is very common to have one master LDAP server and a few other LDAP replica servers, so as to achieve the load-balancing and high availability of the directory data.
您可以为客户端实例安装DB2 客户端的一个副本且为数据库实例安装 DB2服务器的一个副本。
You can install one copy of DB2 client for the client instance and one copy of DB2 server for the server instance.
两个系统都有数据库数据的副本，或者都可以访问同一个副本，当检测到故障时，就会进行故障转移。
Two systems have copies of the database data or access to a single copy, and when a failure is detected, a failover takes place.
这样一来，放置组(以及副本)到存储设备的映射就不用依赖任何元数据，而是依赖一个伪随机的映射函数。
In this way, mapping of placement groups (and replicas) to storage devices does not rely on any metadata but instead on a pseudo-random mapping function.
例如，当一个用户登录时，我们根据存储在数据库中的密码和用户标识副本检查密码和用户标识。
For example, when a user logs on we check the password and userid against a stored copy in our database.
对一个数据网格的任何更改都将要传播到该数据网格的所有副本。
Any change to a data grid is persisted across all of the replicas of that data grid.
为了在备用服务器上保持数据库的一个同步副本，系统会一致地将DB 2HADR日志文件从主要服务器发送到备用服务器来保持二者的同步。
To keep a synchronized copy of the database on the standby server, DB2 HADR log files are consistently sent from the primary to the standby to keep the two in sync.
每个RSS服务器维护数据库的一个完整的副本。
这个例程用新的分区键创建了现有表的一个副本并用来自原始表的数据对它进行部分或全部加载。
This routine creates a copy of your existing table with the new partitioning key and loads it partially or fully with the data from the original table.
两者的主要区别在于，链接为一个文件提供多个名称，而制作文件副本会创建两套名称不同的相同数据。
The major difference is that links provide multiple names for a single file, while a copy creates two sets of identical data under two different names.
当一个控制器需要从视图获取数据时，视图提供模型的一个副本，其中包含当前的UI内容。
When a controller wants to get data from the view, the view provides a copy of the model populated with the current UI contents.
如果集群的服务器超过两个，您应该仅维护数据库的一个副本(只要能够满足可用性需求)。
If you cluster more than two servers, you should maintain only one replica copy of a database (as long as this can meet your availability needs).
假定服务实现工作在一个可能已经被从其最初源转移或者转换的数据的瞬时副本上。
Assume that service implementations are working on a transient copy of the data that may have been transferred, transformed, or both from its original source.
数据库副本的个数从两个减少到一个。
The number of database replications is reduced from two to one.
但是，UNLOAD实用程序可以让您从之前做的备份副本上获取数据，这是一个将有助于您获得历史数据的功能。
But, the UNLOAD utility can let you get data from previously taken backup copies, a feature which will help you to get historical data.
对于每个主数据网格，将在不包含该主数据网格的设备上创建一个副本数据网格。
For each primary data grid, a replica data grid is created on an appliance that does not contain the primary data grid.
使用一个数据库的多个副本时要解决的最大问题是，如何保持它们同步，以及如何跨多个副本创建一致的查询结果。
The largest issue that must be addressed when using multiple copies of a database is how to keep them synchronized and how to create consistent query results across the copies.
模型的主实例保持长期状态，并提供应用程序逻辑；而视图使用的副本实际上是一个可任意使用的数据访问对象。
The primary instance of the model is keeping long-term state and providing application logic; the copy used by the view is essentially a disposable data-access object.
DB 2中的备份是一个数据库以及控制信息的副本，可以用于恢复错误事件。
Backup in DB2 is a database copy, together with control information, ready to be restored in the event of a failure.
例如，要单元测试一个使用数据库的对象，安装、配置和发送本地数据库副本、运行测试然后再卸装本地数据库可能很麻烦。
For example, to unit test an object that USES a database, it may be burdensome to install, configure, and seed a local copy of the database, run your tests, then tear the local database down again.
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