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RDBMS vs NoSQL

RDBMS​

Pros:

  • Data integrity and consistency.
  • Well-suited for structured data and complex relationships.
  • Mature technology with standardized querying (SQL).

Cons:

  • Limited scalability for very large or high-velocity data.
  • Schema changes can be rigid and complex.
  • Not ideal for rapidly changing or unstructured data.

NoSQL​

Pros:

  • Horizontal scalability for high-volume data.
  • Flexible schema for unstructured or semi-structured data.
  • High performance and variety of database models.

Cons:

  • Lack of unified query language.
  • Limited ACID transactions in some cases.
  • Learning curve for new database models.
  • Data integrity challenges based on model and configuration.

NoSQL stores, in general, always maintain a certain number of replicas to offer reliability. Also, in such data stores, deletes don't get applied instantly; data is retained for certain days (to support undeleting) before getting removed from the system permanently.