在此情况下，您需要将主要计算机上的数据库作为备用数据库启动，以便这两个数据库重新保持同步。
In this situation, you need to start the database on the primary machine as the standby to get the two databases back in sync again.
例如，在数据存储库层，登台数据库和存储库数据库可以在不同的服务器上、在同一服务器上或者甚至在不同模式下的同一数据库中。
For example, in the data repository tier, staging and repository databases can be on different servers, on the same server, or even in the same database under different schemas.
数据库的备份是数据库的副本以及一些控制信息，在出现故障的情况下，可以随时用它进行恢复。
A backup of a database is a database copy, together with control information, ready to be restored in the event of a failure.
在大多数情况下，应该像建立到数据库的连接中所描述的那样编目数据库连接，以便可以从命令行测试该连接。
In most cases, you should catalog the database connections as described in Setting up a connection to a database so that you can test the connection from the command line.
这时将显示域中已经配置的基本项；在此情况下，您将看到与基于文件的存储库和数据库存储库对应的基本项（图17）。
The already configured base entries in the realm are shown; in this case, you will see the base entries corresponding to the file-based and database repositories (Figure 17).
但是，在大多数情况下，这样做不好，因为这将在数据库与数据库应用程序之间引入紧密连接。
In most cases, however, this is a bad idea, because it introduces a tight connection between your database and your database application.
在开始使用数据库之前，请花点时间来了解一下数据库应当保存哪些内容。
Before you start using your database, take a minute to figure out what the database should hold.
注意，默认情况下数据库管理员或系统管理员并不拥有数据库安全管理员权限。
Note that a database administrator or system administrator does not possess the database security administrator authority by default.
在DB 2中，在发出与数据库相关的命令之前，总是要连接到数据库。因此，在这种架构下，对象名称不需要包括数据库名称。
In DB2 you always connect to a database before issuing database specific commands; therefore, under this architecture, object names need not include the database name.
数据库持久性的缺点在于数据库的成本，特别是存储在数据库中的会话数据本身应该具有高可用性的情况下更是如此。
The disadvantage of database persistence is the cost of the database, particularly if the session data stored in the database should itself be highly available.
在后者的情况下，为了维护多数据库环境内由数据库生成的主键的惟一性，这些片中必须有一个片被指定用来生成这些键。
In the latter case, to maintain uniqueness of the database-generated primary key in a multi-database environment, one of the slices is designated to generate these keys.
我们的应用程序有多个在大多数情况下只和数据库“A”打交道的服务层方法；它们偶尔也会从数据库“B”中获取只读数据。
Our application has several service layer methods which only deal with database “A” in most instances; however occasionally they also retrieve read-only data from database “B”.
现在看一下在J2EE环境中，数据库和非数据库资源类型当前可以使用哪些连接合用设施。
Now I will look at what connection pooling facilities are currently available for database and non-database resource types in the J2EE environment.
同样，如果有从以前版本的DB 2升级过来的数据库，那么缺省情况下这些已有的数据库没有启用这些特性。
Likewise, if you have databases being upgraded from previous versions of DB2, these existing databases will not have these features enabled by default.
缺省情况下，该存储库是文件存储库，但可以更改该存储库，稍后您将了解到这一点。
By default, this is the file repository, but this can be changed, as you will see later.
在数据库离线或在线的情况下，使用RMAN实用程序备份数据库。
Use the RMAN utility to back up the database while the database is offline or online.
还要求在同一联合存储库配置下配置的所有用户存储库中，用户ID必须是唯一的。
It is also required that the user ID be unique across all user repositories that are configured under the same federated repository configuration.
在不考虑数据库运行所需的额外硬件的情况下，数据库持久性的性能也好于内存到内存复制。
The performance of database persistence is also better than memory to memory replication, when not taking the extra hardware that the database is running on into account.
这样，日后就可以在不改变库代码的情况下修改具体的类，因为库只依赖接口中创建的定义。
In this way, you can change the concrete class later without changing the library code, which relies solely on the definition you created in the interface.
在通常情况下，在开发数据库上开发应用程序，在另一个数据库上测试，最后部署在生产数据库上。
Typically, applications are developed on a development database, tested on a different database, and finally deployed on yet another database.
通常情况下，嵌入式数据库打包为库，与应用程序代码直接链接。
Typically, an embedded database is packaged as a library and is linked directly to application code.
类似的，数据库重构是对数据库方案的简单变更，是在不破坏且不添加东西的情况下改进设计。
Similarly a database refactoring is a simple change to a database schema which improves the design without breaking nor adding anything.
在哪些情况下，用面向文档的数据库优于关系型数据库？
What are some use cases for using a document-oriented database over the relational one?
然而，即便是都是关系型数据库的环境下，由于不同的数据库产品，也会导致SQL在使用上，语法和格式也各不相同。
However, even within an RDBMS environment, the actual syntax and format of the SQL statements may vary depending on the particular database product.
在很多情况下，后端数据库实际上是大型主机数据库，例如IBM基于大型主机的分层dbmsIMS。
In many cases, the back-end database is actually a mainframe database such as IMS, IBM's mainframe - based hierarchical DBMS.
我使用了基于内存的数据库选项在内嵌模式下开启了HSQLDB数据库。
I've started the HSQLDB database in embedded mode using the memory-based database option.
经典讨论数据库显示，在支持200个用户且响应时间小于一秒的情况下，经典讨论数据库IOP更少。
The classic discussion database showed fewer IOPs for the 200 users supported with response times less than one second.
也可以在数据库系统没有离线的情况下执行离线备份，方法是当复制数据库目录的时候冻结系统（阻塞所有写操作）。
Offline backup can also be performed without bringing the database system offline by freezing the system (blocking all write operations) while copying the database directory.
这里我们有一个人才库，在有效的支持下，该人才库能够填补合适工作空缺的空白。
Here we have a talent pool that is underutilized of people who can be filling in some of the gaps in the right kind of jobs with the right kind of support.
onpload数据库可以在ObjectExplorer中找到，位于为ids创建的连接中可用的数据库清单下。
The onpload database can be found in Object Explorer, under the listing of databases available in the connection created to IDS.
应用推荐