Linux Foundation Hyperledger Fabric Certified Practitioner Exam

In Hyperledger Fabric, to enable CouchDB as the state database, the stateDatabase configuration option in the core.yaml file must be changed from goleveldb to CouchDB. This change directs the peer to use CouchDB instead of the default LevelDB for storing the world state, which can then be queried using rich queries and provides additional features like indexing.

Chaincode in Hyperledger Fabric is essentially smart contract software that defines assets and the transaction instructions for modifying these assets on the ledger. Chaincode functions as the business logic layer of the network, where the rules for interacting with the ledger are specified. It is executed on the network peers and is used to encode the policies and constraints associated with asset exchanges or updates within the business network. This setup allows organizations to automate processes and enforce consistency and compliance across transactions.

In Hyperledger Fabric, a unique ID to represent an asset on the ledger is typically generated in the client application before the transaction is submitted to the blockchain. This approach ensures that each asset has a unique identifier, which is crucial for tracking and managing assets throughout their lifecycle on the ledger.

The last step in the Hyperledger Fabric transaction flow is the commitment of the transaction to the ledger and the subsequent notification to the client application1. Once the transaction has been endorsed and ordered, it is committed to the ledger on all peers. After the transaction is committed, the peers asynchronously notify the client application of the success or failure of the transaction.This ensures that the client application is aware of the outcome and can take appropriate actions based on the result of the transaction1

In Hyperledger Fabric, the standard possibilities to configure parameters of a component, such as a peer or orderer, include using YAML configuration files, environment variables, and command-line interface (CLI) flags. This approach provides flexibility and allows for detailed control over the parameters that govern the behavior of these components .