Database Management System A Complete PPT for XII

Types of Database Models
Hierarchical Model
Relational
Database Model
Network Model

Hierarchical Model
Relational
Database Model
Network Model
Network Model

Network Model

Network Model
Hierarchical Model

Hierarchical Model

Hierarchical Model
Relational
Database Model

Relational
Database Model

Centralized Database and Distributed Database

Centralized Database
A centralized database is basically a type of database that is stored,
located as well as maintained at a single location only. This type of
database is modified and managed from that location itself. This
location is thus mainly any database system or a centralized computer
system. The centralized location is accessed via an internet
connection (LAN, WAN, etc). This centralized database is mainly used
by institutions or organizations.

Advantages:
1. Since all data is stored at a single location only thus it is easier to
access and coordinate data.
2. The centralized database has very minimal data redundancy since
all data is stored in a single place.
3. It is cheaper in comparison to all other databases available.

Advantages:
1. Since all data is stored at a single location only thus it is easier to
access and coordinate data.
2. The centralized database has very minimal data redundancy since
all data is stored in a single place.
3. It is cheaper in comparison to all other databases available.
Disadvantages:
1. The data traffic in the case of a centralized database is more.
2. If any kind of system failure occurs in the centralized system then
the entire data will be destroyed.

A distributed database is basically a type of database which consists
of multiple databases that are connected with each other and are
spread across different physical locations. The data that is stored in
various physical locations can thus be managed independently of
other physical locations. The communication between databases at
different physical locations is thus done by a computer network.
Distributed Database
Disadvantages:
1. The data traffic in the case of a centralized database is more.
2. If any kind of system failure occurs in the centralized system then
the entire data will be destroyed.

A distributed database is basically a type of database which consists
of multiple databases that are connected with each other and are
spread across different physical locations. The data that is stored in
various physical locations can thus be managed independently of
other physical locations. The communication between databases at
different physical locations is thus done by a computer network.

Advantages:
1. This database can be easily expanded as data is already spread
across different physical locations.
2. The distributed database can easily be accessed from different
networks.
3. This database is more secure in comparison to a centralized
database.

Disadvantages:
1. This database is very costly and is difficult to maintain because of
its complexity.
2. In this database, it is difficult to provide a uniform view to users
since it is spread across different physical locations.
Advantages:
1. This database can be easily expanded as data is already spread
across different physical locations.
2. The distributed database can easily be accessed from different
networks.
3. This database is more secure in comparison to a centralized
database.

Database Security
Elements of Data Security
Confidentiality
Integrity
Availability

Database Security
Confidentiality
Integrity
Availability
Confidentiality
Integrity
Availability

Database Security
Confidentiality
Integrity
Availability
Different Levels of Data Security
Physical
Human
Operating System
Network

Different Levels of Data Security
Database Security
Physical
Human
Operating System
Network
Data Security Technologies
Authentication
Encryption
Tokenization
Data Masking
Access Controls
Backup and Recovery
Installing Firewall
Update Software
Manage
Physical
Controls

Tokenization
Encryption
Data Security Technologies
Database Security
Authentication
Data Masking
Access Controls
Backup and Recovery
Installing Firewall
Update Software
Manage
Physical
Controls
Authentication

Database Security
Authentication
Encryption

Encryption
Database Security
Tokenization

Tokenization
Database Security
Data Masking

Data Masking
Database Security
Access Controls

Access Controls
Database Security
Backup and Recovery

Backup and Recovery
Database Security
Installing Firewall

Installing Firewall
Database Security
Update Software

Update Software
Database Security
Manage Physical Controls

Database Management System A Complete PPT for XII

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