There are many research papers on problem of scalability of blockchains:
Just as an example : An Overview of Blockchain Technology: Architecture, Consensus, and Future Trends
However, (usually by some companies which uses
blockchain technology), it's mentioned that one of the advantages of
blockchain against centralized
relational databases, is scalability.
Just as an example : WePower White Paper.
Quote from this white paper:
Relational databases are adequate in many applications and situations. However, sustainability and scalability are limited with these databases. From the perspective of sector transformation in trading and digital infrastructure creation, transforming energy production to 100% renewable, the answer was to utilize a public blockchain.
Is it a correct proposition?