Car lease demo database location in IBM blockchain

Question

I deployed car-lease-demo sample on a Linux system while working on IBM blockchain. I want to understand about the database storage and how hyperledger fabric uses the database to store key-value pairs. Also, where is the location of the database where all the data is stored?

I would also like to know if we can use a different db configuration like NOSQL databases like Neo4j, MongoDB.

Answer 1

Firstly, yes you can change the default DB to any other NoSQL DB.

Though the default implementation uses LevelDB as the backend store for data and is present on all peer nodes. To see it for yourself, you can enter the docker container in cli mode. The database is hosted in a separate container linked to the peer node via an open port.You can do the same for any other NoSQL DB and use the correct PUT and GET APIs in chain code to access them. But make sure that data gets replicated in all the DBs in time to maintain the consistency of the Blockchain network