What are the advantages and disadvantages of NoSQL non-relational databases?

Non-relational NoSQL databases have a number of advantages and disadvantages:

Advantages:

• Flexible data schema: can store data without a strict structure, which is convenient for rapidly changing requirements.
• High scalability: easily scaled horizontally, which is important for large volumes of data.
• High performance for certain types of loads, such as working with large volumes of unstructured data.
• Support for various data models: documents, key-value, graphs, column stores.

Disadvantages:

• Lack of a standard query language like SQL, which complicates migration and learning.
• Limited support for transactions and data integrity compared to relational DBMS.
• Less maturity and support in some systems.
• Possible difficulties with data consistency (CAP theorem).

Choosing NoSQL is justified when flexibility, scalability, and working with unstructured data are required.