Summary of DBMS Architecture
Main Ideas and Concepts
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Centralized DBMS Architecture
- Early DBMS systems operated on mainframe computers.
- Users accessed these systems via terminals that could only display information, with all processing done remotely.
- As hardware costs decreased, terminals were replaced by personal computers, but the DBMS remained centralized, with all functionalities executed on one machine.
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Client-Server Architecture
- Developed to manage a large number of personal computers and devices connected through a network.
- Specialized servers (e.g., file servers, printer servers) handle specific functionalities.
- Clients (user machines) provide interfaces for users to access these servers.
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Two-Tier Client-Server Architecture
- In this model, user interfaces and application programs are moved to the client side, while query and transaction functionalities are retained on the server side.
- The server is often referred to as the query server or transaction server, commonly using SQL.
- Open Database Connectivity (ODBC) is used for client programs to connect to the DBMS on the server side.
- Advantages include simplicity and compatibility with other systems.
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Three-Tier Client-Server Architecture
- An additional intermediate layer (application server or web server) is introduced between the client and the database server.
- This layer processes requests from the client, sends commands to the database server, and formats data for presentation to the user.
- The three tiers consist of the user interface, application rules, and data access.
Methodology and Instructions
- Familiarize with the concept of centralized vs. client-server architectures.
- Learn the distinctions between two-tier and three-tier architectures.
- Recognize the roles of ODBC and JDBC for database connectivity.
Speakers/Sources Featured
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Category
Educational