DDBS

The Security Strategy of DDBS Based on Oracle

基于Oracle开发分布式数据库系统的安全策略

In DDBS query processing, Semi-Join is often used to realize joins of relations distributed among different sites.

在分布式数据库系统的查询处理中，普遍采用半连接的方法实现分布在不同站点间的关系的连接，以降低通讯开销。

Research of Concurrency Control in DDBS Based on Lazy Replication

基于松散复制的分布式并发控制的研究

In the development process of DDBS, the link of among sites is diversified. In view of this fact, the parallel layered link is studied and the parallel layered link 2PC ( P2L2PC) protocol is put forward.

针对分布式数据库系统发展过程中站点连接链路的多样性，研究了并行分层式连接结构，并在并行分层式连接结构基础上，提出了并行分层式链路2PC（P2L2PC）协议。

Transaction Control Based on Timestamp in Lazy Replication DDBS

懒散复制DDBS中基于时标的事务控制

A consistency algorithm for realizing the reconfiguration of partitioned database in DDBS

DDBS中实现分割数据库重构的一致性算法

DDBS eliminate many disadvantages of conventional centralized database system, suit many non-centralized architecture.

分布式数据库消除了传统集中式数据库的许多缺点，适合于多种非集中式体系结构。

Adsorption from mixed solutions of sodium dodecylbenzenesulfonate ( DDBS) and Fe+++ on the powder of tetraphynelporphyrin ( TPP) has been studied.

研究了四苯基卟吩（简称TPP）粉末对水溶液中十二烷基苯磺酸钠（简称DDBS）和Fe~（+++）离子的吸附。

DDBS eliminate many disadvantages of conventional centralized database system , suit many non-centralized architecture.

分布式数据库消除了传统集中式数据库的许多缺点, 适合于多种 非 集中式体系结构.

( b) Now, many DDBS protocol have been researched, but these protocol adopted basically "one vote one-off veto" of voting means.

目前已经提出许多分布式数据库提交协议，尽管这些协议都能保证分布式事务ACID特性，但基本采用的是投票法的一票一次性否决规则。

In the field of DDBS ( distributed database system), distributed data updating is a very important researchful problem, because data updating must fulfil integrality, coherence, reliability and stability of the database.

在分布式数据库领域，分布式数据更新是极其重要的研究课题，因为数据更新操作必须满足数据库的完整性、一致性、可靠性和稳定性要求。

The Simulating analysis of measuring the Mean Time of Response in DDBS

分布式数据库系统平均响应时间模拟测定分析