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

stub.GetHistoryForKey()

Answer

stub.QueryLedger()

Answer

stub.ScanKeys()

Question 2

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

Accepted Answer

stub.GetQueryResult()

Answer

stub.GetStateByRange()

Answer

stub.QueryStateDB()

Answer

stub.RichQuery()

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

Installs chaincode on all peers

Answer

Commits chaincode to the channel

Answer

Approves chaincode for an organization

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

All organizations in the channel

Answer

Only the ordering organization

Answer

At least one organization

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

Registers the chaincode with the ordering service

Answer

Initializes CouchDB connections

Answer

Creates the channel ledger

Question 6

Which method retrieves the history of state changes for a specific key in Fabric chaincode?

Accepted Answer

stub.GetHistoryForKey()

Answer

stub.GetStateByRange()

Answer

stub.GetTransactionHistory()

Answer

stub.GetKeyVersions()