Download Introducción a Sistemas de Información

Base de Datos
Clase: 5 y 7 de septiembre
Data Management:
Focuses on data collection, storage, and retrieval, thus constitutes a core activity for any
organization.
Typically, efficient data management requires the use of a computer database. A
database is a shared, integrated computer structure that house a collection of:
End user data: that is, raw of interest to the end user.
Metadata:
or “data about data”, through which the data are integrated.
The metadata provide a description of the data characteristics and the set of relationship
that link the data found within the database. In a sense, a database resembles a very wellorganized electronic filling cabinet in which powerful software, known as a database
management system(DBMS), helps manage the cabinet’s contents.
DBMS :
is a collection of programs that manages the database structure and controls
access to the data stored in the database.
Important elements of the DBMS:
1.
2.
3.
4.
5.
6.
Helps make data management much more efficient and effective than it was
before the DBMS became a reality.
contains a query language that makes it possible to produce quick answers to add
hoc queries.
helps create an environment in which end users have better access to more and
better-managed data than they did before the DBMS became the data
management standard.
Makes it possible to share the data in the database among multiple applications of
users.
Serves as the intermediate between the database and the user(s).
Hides much of the database’s internal complexity from the applications programs
that use the database.
The Database System Environment
The term database system refers to an organization of components that defines and
regulate the collection, storage, management and use of data within a database environment. The
database system is composed of the five parts:
1.
hardware
2.
software
3.
People
4.
Procedures
5.
Data
Types of database systems
1.
2.
Single user
Multiuser
DBMS functions
1.
2.
3.
4.
5.
6.
7.
8.
9.
Data Dictionary management
Data storage management
Data transformation and presentation
Security management
Multi-user access control
Backup and recovery management
Data integrity management
Database access languages and application programming interfaces
Database communications interfaces
Database Models
Database model is a collection of logical constructs used to represent the data structure
and the data relationships found within the database. Can be grouped into two categories:
conceptual models and implementation models. The conceptual model focus on the logical
nature of the data representation. Conceptual models include the Entity Relationship(E-R).
Conceptual models use three types of relationships to describe associations among data. These
three relationship types are one-to many, many- to-many and one-to one.
Asignación.
1.
Busque información sobre cada uno de los modelos y de los sistemas de base de
datos.