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Fundamentals of database systems

Fundamentals of database systems

lecha November 25, 2023

Introduction In today's digital era, a database system stands as a hub in managing and organizing vast pools of data. It serves as a structured repository, facilitating efficient data handling, retrieval, and manipulation. Let's go deeper in…

Database Architecture Layers

Conceptual Layer

Database Architecture Layers

lecha November 20, 2023

The architecture of a database system can be divided into three fundamental layers, each serving a distinct purpose: External Layer The external layer is an essential component of the database system that facilitates interaction between users and ap…

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1-Tier Architecture 1NF 2-Tier Architecture 2NF 3-Tier Architecture. 3NF addressing mechanisms Advantages Aggregation alignment with needs. 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Database Organization database performance database queries Database Query database query language Database Query Languages Database Relationships database retrieval Database Schema Database Software Overview: Oracle Database Structure Database System Database Systems Database Techniques Database Transformation Date and Time Datatypes DBMS DBMS Overview: Functions Decision-Making Deletion Deletion Anomalies Direct Access Storage Direct File Organization disk capacity disk organization disk structures DISTINCT Keyword Distributed Database Architecture DML commands Domain Relational Calculus Double Hashing DQL Durability Dynamic Hashing Dynamic Multilevel Indexing E-commerce E-commerce SQL EER Model efficient data management efficient data retrieval Efficient Database Operations Eliminating Dependencies End User Entity Relationships Entity-Relationship data model ER Diagram ER Model Evolution of Data Management Extendible Hashing External Actors External Layer File Backup File Compression File Creation File Deletion File Encryption File Opening File Operations File Organization file organization. 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Numeric Datatypes Object-Oriented data model Object-Oriented DBMS Object-Relational data model Object-Relational data model. Object-Relational Mapping data model (ORM) One-to-Many Relationship One-to-One Relationship Open Hashing Operational Efficiency Optical Disc Optical Discs Optical Disks Optimal Data Structure ORDER BY ordered file-based indexes Ordered Files Ordered Indexes Partial Dependencies performance Persistence Physical Data Independence Physical Storage PostgreSQL. Factors influencing selection: scalability primary indexes Procedures and Guidelines Projection Quadratic Probing query language tutorial Query Processing. 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