Storing Big Data

Different techniques apply to structured data and big data (which is generally unstructured). Which of the following statements is correct ?

Unstructured data is horizontally scalable and multiple servers store multiple copies of the data. The CAP Theorem is a rule to understand how the quesried database behaves:

-Consistency (C): all the data nodes have the same copy of the data
-Availability (A): if a node fails, the others still function
-Partition tolerance (P): this means that the DFS continues to work if there is a network partition. “Network partition” means that there is a physical disruption of communication channels between datanodes.

Which of the following statements is incorrect ?

No-SQL databases are a kind of database where Structured Query Language cannot be used to access the database.

It aims to increase: scalability, availability and performance.

What of the following statements are correct ?

Cloud storage is the popular way of storing data and is replacing hard disks when the amount of data becomes sizeable. Which are the following statements are false ?

Data was present before computing. What kind of data was collected then ?

When seeing an image on social media on a picture before it loads, one can often see : This image suggests a man playing soccer….what is the name of this technique of bringing structure to unstructured data.