ICT role in 21st century education and its challenges
Group4 Unit5
1. Royal University of Phnom Penh
MIS ដដដដដដដដដដដដដដដដដដដ
ដ
ដ Mr Kean Tak
Member
Group
1. Ny Rachakna 6. Ly Limkri
2. Ngin Visal 7. Ly Sotharith
3. Orm SovannTara 8.MengChheng
4. My Poleak 9. Ngim Ratana
5. Loy Sakvanna 10.Nhem Ratbophea
3. Data Modeling and the
Database Characteristise
When building a database, an organization must consider:
Content:
What data should be collected and at what cost?
Access:
What data should be provided to which users and when?
Logical structre:
How should data be arranged so that it makes sense
to a given user?
Physical
organization: data be physically located?
Where should
4. Data Center
Climate-controlled building or set of buildings that:
House database servers and the systems that deliver
mission-critical information and services.
Traditional data centers
Consist of warehouses filed with row upon row of
server racks and powerful cooling systems
5. Data Modeling
Building a database requires two type of
designs
Planned data redundancy
Data Model
Enterprise data modeling
Entity-relationship(ER) diagrams
6. Data Modeling
Building a database requires two types of designs
Logical design:
shows an abstract model of how the data should be
structured and arranged to meet an organization’s
information needs
Physical design
starts from the logical database design and fine-
tunes it for performance and cost considerations
7. Data Modeling
Data Model
a diagram of data entities and their relationships
Enterprise data modeling
Starts by investigating the general data and information
needs of the organization at the strategic level
Entity-relationship(ER) diagrams
data models that use basic graphical symbols to
show the organization of and relationships between data