Recall
following Facts:
§ Blockchain does not store any of its
information in a central location.
§ Instead, the blockchain is copied and spread across
a network of computers.
§ Whenever a new block is added to the
blockchain, every computer on the network updates its blockchain to
reflect the change.
§ A blockchain can be
either centralized or decentralized.
§ It is important,
however, that decentralized
not be confused with distributed.
Difference between Centralized Database and Distributed Database
1.
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
–
·
Since
all data is stored at a single location only thus it is easier to access and co-ordinate data.
·
The
centralized database has very minimal data redundancy since all data is stored at a single
place.
·
It
is cheaper in comparison to all other databases available.
Disadvantages
–
·
The
data traffic in
case of centralized database is more.
·
If
any kind of system failure
occurs at centralized system then entire data will be destroyed.
2. Distributed Database :
·
A distributed database is basically a type of database which consists of multiple
databases that relate
to each other and are spread across different physical locations.
·
The data that is stored on 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 –
·
This database can be easily expanded as data is
already spread across different
physical locations.
·
The distributed database can easily be accessed
from different networks.
·
This database is more secure in comparison to centralized database.
Disadvantages –
·
This database is very costly and it is
difficult to maintain because of its complexity.
·
In this database, it is difficult to provide a uniform view to user
since it is spread across different physical locations.
Difference
between Centralized database and Distributed database
|
S.NO. |
Centralized
database |
Distributed
database |
|
1. |
It is
database that is stored, located as well as maintained at a single location only. |
It is a
database which consists of multiple databases which are
connected with each other and are spread across different physical locations. |
|
2. |
The
data access time in case of multiple users is more in a centralized database. |
The
data access time in case of multiple users is less in a distributed database. |
|
3. |
The management, modification and
backup of this database is easier as entire data is present at the same location. |
The management, modification and
backup of this database is very difficult as it is spread across different physical locations. |
|
4. |
This
database provides a uniform
and complete view to the user. |
Since
it is spread across different locations thus it is difficult to provide a uniform view to
the user. |
|
5. |
This
database has more data
consistency in comparison to distributed database. |
This
database may have some data replications thus data consistency is less. |
|
6. |
The
users cannot access
database in case database failure occurs. |
In
distributed database if one database fails users have access to other databases. |
|
7. |
Centralized
database is less costly. |
This
database is very expensive. |