databasesIIIdistributedDBMSs

databasesIIIdistributedDBMSs - III. Current Trends: 1 -...

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Unformatted text preview: III. Current Trends: 1 - Distributed DBMSs Slide 1/32 III. Current Trends Part 1: Distributed DBMSs: Concepts and Design Lecture 12 (2 hours) Lecturer: Chris Clack 3C13/D6 III. Current Trends: 1 - Distributed DBMSs Slide 2/32 12.0 Content 12.1 Objectives 12.2 Overview of Networking 12.3 Introduction to DDBMSs- Concepts- Advantages and Disadvantages- Homogeneous and Heterogeneous 12.4 Functions and Architecture - Functions of a DDBMS- Reference Architecture for a DDBMS/ Federated MDBS 12.5 Distributed Relational Database Design- Data Allocation- Fragmentation Content 12.6 Transparency in a DDBMS- Distribution Transparency - Transaction Transparency- Performance Transparency 12.7 Dates 12 Rules for DDBMs 12.8 Summary III. Current Trends: 1 - Distributed DBMSs Slide 3/32 12.1 Objectives Objectives In this Lecture you will learn: Concepts. Advantages and disadvantages of distributed databases. Functions and architecture for a DDBMS. Distributed database design. Levels of transparency. Comparison criteria for DDBMSs. III. Current Trends: 1 - Distributed DBMSs Slide 4/32 12.2 Overview of Networking Overview of Networking Network: interconnected collection of autonomous computers, capable of exchanging information. Local Area Network (LAN) intended for connecting computers at same site. Wide Area Network (WAN) used when computers or LANs need to be connected over long distances. WAN relatively slow Less reliable than LANs. DDBMS using LAN provides much faster response time than one using WAN. III. Current Trends: 1 - Distributed DBMSs Slide 5/32 12.2 Overview of Networking Overview of Networking Network: interconnected collection of autonomous computers, capable of exchanging information. Local Area Network (LAN) intended for connecting computers at same site. Wide Area Network (WAN) used when computers or LANs need to be connected over long distances. WAN relatively slow Less reliable than LANs. DDBMS using LAN provides much faster response time than one using WAN. III. Current Trends: 1 - Distributed DBMSs Slide 6/32 12.3 Introduction Concepts Databases and networks: 1. A centralized DBMS could be physically processed by several computers distributed across a network 2. There could be several separate DBMS on several computers distributed across a network 3. There may be a Distributed DBMS (DDBMS) made up of several DBMSs distributed across a network each with local autonomy Each participates in at least one global DBMS action The DDBMS therefore can operate as a single global DBMS III. Current Trends: 1 - Distributed DBMSsIII....
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databasesIIIdistributedDBMSs - III. Current Trends: 1 -...

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