分布式数据库系统可以看作是一系列集中式数据库系统的联合。
Distributed database system may be regarded as a series of union of centralized database system.
查询优化：分布式数据集成系统查询优化的目标与集中式数据库有所不同。
Query optimization: the goals of query optimization in distributed data integration system are different from those in traditional database system.
分布式数据库系统虽然基于集中式数据库系统，但却有一定的特色和理论基础。
The distributed database system has its own characters and theory, though it was based on the centralized database system.
由于集中式数据库和分布式数据库的区别在于，分布式数据库需要站点间的数据传输。
There is difference between centralized database and distributed database, which distributed database needs data transportation.
由于分布式数据库系统并不是网络技术与集中式数据库的简单结合，需要在合适的系统架构上实现。
As distributed database system is not a simple combination of network technology and centralized database, it needs to achieve in a suitable system framework.
当用户登录时，LDAP客户端向LDAP服务器发送一个查询，以便从集中式的数据库中获取这个用户和组的信息。
When users log in, the LDAP client sends a query to the LDAP server to get the user and group information from the centralized database.
Kerberos正是这样的一种身份验证协议，它通过在称为密钥分发中心(KDC)的中央存储库中存储相关信息的数据库，从而提供集中式的身份验证。
Kerberos is one such network authentication protocol that provides centralized authentication by storing the database of relevant data in a central repository known as a Key Distribution Center (KDC).
尽管数据库技术有了很大提高，集中式数据存储对这种需求和响应能力的应用程序来说还是存在问题。
Despite advances in database technology, a centralized datastore proves problematic for applications at this level of demand and responsiveness.
分布式数据库死锁检测算法主要分为集中式、层次式和分布式。
Deadlock detection algorithms of distributed database can be classified into centralized, layered and distributed.
该软件维护一个集中式的帮助信息数据库。
A program that will keep a centralized database of howto's for a help desk.
该软件维护一个集中式的帮助信息数据库。
A program that will keep a centralized database of howto's for a help desk.
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