0
Add your answer:
Earn +20 pts
What is network model in DBMS?
network model is a collection data in which records are physically linked through linked lists .A DBMS is said to be a Network DBMS if the relationships among data in the database are of type many-to-many. The relationships among many-to-many appears in the form of a network. Thus the structure of a network database is extremely complicated because of these many-to-many relationships in which one record can be used as a key of the entire database. A network database is structured in the form of a graph that is also a data structure .
Difference between hierarchical and Network data module?
The hierarchical data model organizes data in a tree-like structure with a single parent for each child record. On the other hand, the network data model allows for multiple parent-child relationships, creating a more flexible and complex network of interconnected records. In the hierarchical model, relationships are one-to-many, while in the network model, relationships can be many-to-many.
WHAT NETWORKS collect data from many points over an extended space?
wifi network
How many osi layer are covered in the X25 standard?
Its Three. Which are: Physical, Data Link and Network Layers
How do you transfer info from PC to laptop?
There are many choices. You could burn the data from the desktop onto a cd. You could also network them together and transfer data that way. They have network usb cables that simply that process. just some ideas
What are the difference between hierarchical database and network database?
Hierarchical databases organize data in a tree-like structure with parent-child relationships and a strict one-to-many hierarchy, while network databases use a more flexible model with many-to-many relationships through pointers or links between records. Hierarchical databases are faster for accessing data along predefined paths, while network databases allow for more complex data relationships but can be more complex to manage.
How much does a star network cost?
The hub accepts data from the senders and delivers it to the receiver . in practice , a star network seldom has a symmetric shape . The hub often resides in a separate location from one computer attached to it .
Which database model allows many-to-many relationships among records so that a data element can be accessed by following one of several paths?
Network structure
How many layers of the osi model does the ping command test?
ping checks the physical -> data -> network layers. It uses ICMP
What is meant by network congestion?
When too many packets are present in a subnet, performance degrades. This situation is called Congestion. Update: In any network when there is too much the data traffic at a node that the network slows down or starts loosing data, it is known as network congestion. It degrades quality of service and also can lead to delays, lost data or e.g. dropped calls on a telephone network. - Neeraj Sharma when excess of data travels in a subnet or in node there will be a loss of data, this excess flow is know as network congestion.This demotes the performance in network e.g.improper delivery of fax
What are the Features of network security?
Enterprise security software products provide many features that help to protect companies. Some of the features include the protection of databases, infrastructure such as servers, private and sensitive data, firewalls, protection against hacking and data loss and many more.
Where to use database approach?
ADVANTAGESProvide very efficient "High-speed" retrievalSimplicityThe network model is conceptually simple and easy to design.Ability to handle more relationship typesThe network model can handle the one-to-many and many-to-many relationships.Ease of data accessIn the network database terminology, a relationship is a set. Each set comprises of two types of records.- an owner record and a member record, In a network model an application can access an owner record and all the member records within a set.Data IntegrityIn a network model, no member can exist without an owner. A user must therefore first define the owner record and then the member record. This ensures the integrity.Data IndependenceThe network model draws a clear line of demarcation between programs and the complex physical storage details. The application programs work independently of the data. Any changes made in the data characteristics do not affect the application program.DISADVANTAGESSystem complexityIn a network model, data are accessed one record at a time. This males it essential for the database designers, administrators, and programmers to be familiar with the internal data structures to gain access to the data. Therefore, a user friendly database management system cannot be created using the network modelLack of Structural independence.Making structural modifications to the database is very difficult in the network database model as the data access method is navigational. Any changes made to the database structure require the application programs to be modified before they can access data. Though the network model achieves data independence, it still fails to achieve structural independence.Read more: The_advantages_and_disadvantages_of_database_network_model
