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What Is a DBMS? A very large, integrated collection of data. Models real-world enterprise. – Entities (e.g., students, courses) – Relationships (e.g., Madonna is taking CS564) A Database Management System (DBMS) is a software package designed to store and manage databases.
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Chapters 1 and 2 introduce databases, typical users, and DBMS concepts, terminology, and architecture, as well as a discussion of the progression of database technologies over time and a brief history of data models.
The relational model of data is the most widely used data model today. Main concept: relation, basically a table with rows and columns. A relation schema, describes the columns, or attributes, or fields of a relation.
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The major purpose database system is to provide users with an abstract view of data (i.e. the system hides certain details of data how data are stored and maintained). The logical architecture describes how data in the database is perceived by users.
A fundamental characteristic of the database approach is that the database system contains not only the database itself but also a complete definition or description of the database structure and constraints. This definition is stored in the DBMS catalogue, which contains information such as the
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Relational database management systems support the standard three-level architecture for database. (see Figure 5.1 on p155 of the textbook) The logical level for relational database consists of base tables that are physically stored. These tables are created using a CREATE TABLE command.
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Data and Database Schema. 2 Fundamental hypothesis of database modeling: the information contained in a database is represented on two levels: (1) data (large, frequently modi ̄ed) and (2) structure of data (small, stable in time) 2 Database schema: description of DB structure, accessible by programs. 8. Database =.
