Contents
What are the different types of data layers?
The Data Source Layer is the layer where the data from the source is encountered and subsequently sent to the other layers for desired operations. The data can be of any type. The Source Data can be a database, a Spreadsheet or any other kinds of text file.
What does the data access layer do in.net?
The data layer manages the physical storage and retrieval of data The business layer maintains business rules and logic The presentation layer houses the user interface and related presentation code.
Where is data retrieved in a data warehouse?
The Data received by the Source Layer is feed into the Staging Layer, where the first process that takes place with the acquired data is extraction. The extracted data is temporarily stored in a landing database. It retrieves the data once the data is extracted.
Which is the best approach to data warehouse architecture?
This approach is known as the Bottom-Up approach. The approach where ETL loads information to the Data Warehouse directly is known as the Top-down Approach. Reports can be generated easily as Data marts are created first, and it is relatively easy to interact with data marts. Time, Cost and Maintenance are low.
What do the layers represent in the OSI model?
Each layer associates one or more protocols with the layer. The layers represent data transfer operations common to all types of data transfers among cooperating networks. The OSI Reference Model lists the protocol layers from the top (layer 7) to the bottom (layer 1).
Which is an example of a layer 1 device?
Examples of layer 1 devices include hubs, repeaters & Ethernet cable connectors. These are the basic devices that are used at the physical layer to transmit data through a given physical medium which is suitable as per the network need. Data-link layer is the second layer from the bottom of the OSI Reference Model.
How does each layer on a host act?
Effectively, each layer on a host acts independently of other layers on the same machine. Each layer acts in parallel with the same layer on other hosts. OSI Reference Model