CBDH CBDH Smart Contract Development 2

Question 1

What Fabric feature allows you to query a range of keys in the world state?

Accepted Answer

stub.GetStateByRange()

Answer

GetStateByRange returns an iterator over all key-value pairs between a specified start and end key in the world state.

Question 2

Which Fabric chaincode API enables rich queries against a CouchDB state database?

Accepted Answer

stub.GetQueryResult()

Answer

GetQueryResult executes a rich query against the CouchDB state database using a JSON selector query string.

Question 3

What does the chaincode lifecycle command `peer lifecycle chaincode package` do?

Accepted Answer

Creates a deployable .tar.gz package from chaincode source

Answer

The package command bundles chaincode source, metadata, and dependencies into a .tar.gz file ready for installation.

Question 4

In Hyperledger Fabric 2.x, how many organizations must approve a chaincode definition before it can be committed?

Accepted Answer

The number required by the channel's LifecycleEndorsement policy

Answer

The LifecycleEndorsement policy (default: majority of channel orgs) determines how many organizations must approve before committing.

Question 5

What is the role of `shim.Start(cc Chaincode)` in a Fabric chaincode program?

Accepted Answer

Starts the chaincode process and connects it to the peer

Answer

shim.Start() launches the chaincode process and establishes the gRPC connection between the chaincode and its peer.

CBDH - Certified Blockchain Developer Hyperledger Practice Test