MongoDB

 MongoDB is an open source, document-based database management system that does not require a table schema description. MongoDB - classified as NoSQL and uses JSON-like documents and a database schema. If all four previous DBMSs are well known to most IT professionals, then few have heard of MongoDB. But she confidently takes the 5th line in almost all ratings. And as a result, in our ranking, she also occupies the 5th position.

What is a math problem

 What is a math problem


Math problems are puzzles that require computing power. In this case, tasks are divided into several types:

Decomposition of a single number into factors.
Search for input parameters with a known result, or a hash function.
Calculation of hash function values in a certain sequence if a DDoS attack is suspected.
Hashing is used to solve problems within the Proof-of-Work algorithm. But the development of the network leads to many difficulties, including an increase in the complexity of tasks.