DDBS

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.

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Transaction Control Based on Timestamp in Lazy Replication DDBS

懒散复制DDBS中基于时标的事务控制

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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。

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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。

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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。

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( 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。

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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。

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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

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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

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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

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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

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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。

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