Database Environment Chapter 2. The Three-Level ANSI-SPARC Architecture External Level Conceptual Level Internal Level Physical Data.

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Presentation transcript:

Database Environment Chapter 2

The Three-Level ANSI-SPARC Architecture External Level Conceptual Level Internal Level Physical Data

External Level The users view of the database. This level describes that part of the database that is relevant to the user

Conceptual Level The community view of the database. This level describes what data is stored in the database and the relationships among data. This level represents All entities and their attributes and their relationships The constraints on the data Semantic information about the data Security and Integrity of Information

Internal Level This level describes the physical representation of the data on the computer. Schemas, mapping and instances Data Independence Logical data independence ( Immunity of the external schema to changes in the conceptual schema) Physical data independence ( Immunity of the conceptual schema to changes in the internal schema_

Database Languages The Data Definition Language The Data Manipulation Language Procedural DML Nonprocedural DML Fourth Generation Languages Form Generators, Report Generators, Graphics Generators, Application Generators

Data Models and Conceptual Modeling Data Model – An Integration collection of concepts to describe and manipulate data Object-Based Data Models Entity-Relationship Semantic Record-Based Model Relational Network Hierarchical

Components of a DBMS Query processor Database Manager File Manager DML processor DDL complier Catalog Manager

Software Components of the Database Manager Authorization Control Command Processor Integrity Checker Query Optimizer Transaction Manager Schedule Recover Manager Buffer Manager

Multi-User DBMS Architecture Teleprocessing File-Server Client-Server

System Catalogs A Repository of Information describing the data in the database

Functions of a DBMS Storage, Retrieval and Update A User-accessible catalog Transaction Support Concurrency Control and Services Authorization Services Support for Data Communication Integrity Services Services to Promote Data Independence Utility Services