What is a NoSQL database?
A NoSQL database is used to store unstructured data. The idea comes from big data; most applications and devices create data, and this data is valuable if you store and process it afterward. The volume of data is increasing day by day, and we need to store this data. Think about new cars; they have different devices to store data. We can extend our example to white goods, social media, and so on. In general, relational databases are useful for structured data and a level of records that runs into the millions. Thus, when it comes to handling millions of records as well as unstructured data, NoSQL is useful.
The following figure shows how different data sources can be generated to be stored in a NoSQL database. We have social media resources and machines in cars and planes that generate different data formats:
Figure 10.1 – NoSQL
There are different types of NoSQL databases.
Key-value database
In this NoSQL database...
