[3] The database itself is shared in the form of an encrypted/immutable ledger which makes the information open for everyone.
[4] In actual case, the blockchain essentially has no querying abilities when compared to traditional database and with a doubling of nodes, network traffic quadruples with no improvement in throughput, latency, or capacity.
[5] To overcome these shortcomings, taking a traditional database and adding blockchain features to it sounds more feasible.
[1] The idea behind the blockchain based database concept is to complement the functionality and features of SQL and NoSQL databases with blockchain properties: data immutability, integrity assurance, decentralized control, Byzantine fault tolerance and transaction traceability.
[7] Oracle DBMS implements support for a blockchain-based database model.