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Database Management
System – 2SI
INTRODUCTION
03/03/15 M. GAMHA 2
Course Objective
Study Relational Database Management
Systems (RDBMS)
Relational Database Using
03/03/15 M. GAMHA 3
Specialized software
Need to store information on secondary
memory (disks)
Disk access very long (10 ms, 100 000
times longer then RAM access)
Minimize disk accesses number
Read only the useful information
Store information following structures that
facilitate research
CPU
RAM
SM
03/03/15 M. GAMHA 4
Various Data Management
Systems
 File Management System
(FMS)
 Files
 independent of each other
 content not captured by the
FMS
 description of the content in
each program using
 read / write a tuple
 Database Management
System (DBMS)
 Database
 Integrated Data set
 known content of the DBMS
 Unique description
management by the DBMS
(schema)
 query language evolved
 Advanced features: integrity,
security, multiuser access,
fault resilience
03/03/15 M. GAMHA 5
Database description contents
Description Made with data model help
Model: structuring concepts + use rules
Different models :
- hierarchic
- relational
- objet, ...
A DBMS is characterized by the data model
used
03/03/15 M. GAMHA 6
Database Creation
Description of a set of information with a
model
Schema’s content creation
ex: students, associations, classes,
groups, inscriptions
Expressed with Data Description Language,
or Data Definition Language, DDL )
The DDL depends on the data model used
by the DBMS
03/03/15 M. GAMHA 7
Manipulating a database
Loading, updates, querying
Performed with a Data Manipulation Language
Interactive / included in a host language
assertionnel / navigational
program request
DBMS
schema
DB
response
03/03/15 M. GAMHA 8
In brief
 TYPE
student last name
first name
address
birth-day
Schema
 manipulated by the
DDL
 Used by Database
administrator
 OCCURRENCE
dupond
jean
80 rue des Plantes
13/11/1987
 Database
 Manipulated by the
DML
 Used by applications,
users

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Intro dbms

  • 2. 03/03/15 M. GAMHA 2 Course Objective Study Relational Database Management Systems (RDBMS) Relational Database Using
  • 3. 03/03/15 M. GAMHA 3 Specialized software Need to store information on secondary memory (disks) Disk access very long (10 ms, 100 000 times longer then RAM access) Minimize disk accesses number Read only the useful information Store information following structures that facilitate research CPU RAM SM
  • 4. 03/03/15 M. GAMHA 4 Various Data Management Systems  File Management System (FMS)  Files  independent of each other  content not captured by the FMS  description of the content in each program using  read / write a tuple  Database Management System (DBMS)  Database  Integrated Data set  known content of the DBMS  Unique description management by the DBMS (schema)  query language evolved  Advanced features: integrity, security, multiuser access, fault resilience
  • 5. 03/03/15 M. GAMHA 5 Database description contents Description Made with data model help Model: structuring concepts + use rules Different models : - hierarchic - relational - objet, ... A DBMS is characterized by the data model used
  • 6. 03/03/15 M. GAMHA 6 Database Creation Description of a set of information with a model Schema’s content creation ex: students, associations, classes, groups, inscriptions Expressed with Data Description Language, or Data Definition Language, DDL ) The DDL depends on the data model used by the DBMS
  • 7. 03/03/15 M. GAMHA 7 Manipulating a database Loading, updates, querying Performed with a Data Manipulation Language Interactive / included in a host language assertionnel / navigational program request DBMS schema DB response
  • 8. 03/03/15 M. GAMHA 8 In brief  TYPE student last name first name address birth-day Schema  manipulated by the DDL  Used by Database administrator  OCCURRENCE dupond jean 80 rue des Plantes 13/11/1987  Database  Manipulated by the DML  Used by applications, users