每个应用程序系统在把修改提交给本地系统之后，把更新(常常是以批处理模式)发送给引用主数据系统。
Each application system sends out, often in batch mode, updates to the referential master data system (long) after the changes are committed to the local system.
出现这种情况的原因如下：元数据更新删除了对原先数据块的任何引用，却指向磁盘上没有填充过数据的数据块。
Here's why this could happen: the metadata update would erase any reference to the original data block(s), but would point to data block(s) on disk that were never filled with data.
虽然这意味着数据永远不会写入到位(从来没有被覆盖)，而是写入新块并更新元数据来引用数据。
This means that data is never written in place (never overwritten), but instead new blocks are written and the metadata updated to reference it.
数据库服务器自动发出PREPARE命令，更新引用该表的任何编译过的对象。
The database server automatically issues the prepare statement to update any prepared objects that reference the table.
从数据库中删除对象与检索和更新对象类似：默认情况下，删除一个对象时，不删除它引用的对象。
Deleting an object from the database works along the same lines as retrieval and update: By default, when an object is deleted, none of the objects it references are deleted with it.
更新Web部署描述符，并添加用于数据源的资源引用。
Update the Web deployment descriptor, and add a resource reference for the data source.
这 款应用程序的设计非常简单，每一个屏幕页面都是有关那天恐怖袭击的统计数据，以及截至目前的一些更新，每个页面都关注一个数字（这也是这款应用名称的由来）并解释这个引用数字所代表的意义。
The layout of the app is simple. It's screen after screen of statistics about the terrorist attacks that day as well as updates as to where we stand today.
重命名某一数据库对象后，引用该重命名对象的其他对象将自动使用新名称更新。
When you rename a database object, other objects that reference the renamed object are automatically updated with the new name.
在从引用的原始位置更新该引用的过程中将显示一个进度对话框，并且会重新生成服务客户端以反映元数据中的任何更改。
A progress dialog box is displayed while the reference is updated from its original location, and the service client is regenerated to reflect any changes in the metadata.
若要简化维护，可以更新数据库项目中的对象，以使这些对象使用变量引用其他数据库中的对象。
To simplify maintenance, you can update the objects in your database project so that they use the variables to refer to objects in other databases.
“分层更新”是指在维护引用完整性的情况下，将具有两个或多个相关表的数据集中的已更新数据保存回数据库。
Hierarchical update refers to saving updated data from a dataset that has two or more related tables back to a database while maintaining referential integrity.
“分层更新”是指在维护引用完整性的情况下，将具有两个或多个相关表的数据集中的已更新数据保存回数据库。
Hierarchical update refers to saving updated data from a dataset that has two or more related tables back to a database while maintaining referential integrity.
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