Chaincode Development, Deployment, and Lifecycle Management BDC Practice Questions (Page 1)

Questions 1–5

1. 1application · medium

   A chaincode function iterates over all asset records to compute a total value. The function is invoked frequently and is causing performance issues. What is the most effective optimization?

   • AMaintain a running aggregate in a separate state key and update it incrementally on each asset change.
   • BUse the CouchDB rich query to compute the sum on the database side.
   • CCache the total value in the chaincode's global variable.
   • DIncrease the peer's memory to speed up the iteration.
   Reveal Solution Discussion Select an answer first
2. 2foundation · easy

   In the Hyperledger Fabric chaincode lifecycle, what is the correct sequence of operations to deploy a chaincode?

   • AInstall, package, instantiate, commit
   • BPackage, approve, install, commit
   • CPackage, install, approve, commit
   • DInstantiate, install, approve, commit
   Reveal Solution Discussion Select an answer first
4. 3application · medium

   A chaincode function allows users to create new assets. The function currently allows any user to create an asset. The business requirement is that only users with an 'admin' role can create assets. The chaincode uses the Fabric Client Identity (CID) library. What is the most appropriate way to enforce this?

   • AUse cid.GetAttributeValue('role') to check if the caller has the 'admin' attribute.
   • BUse cid.GetMSPID() to check if the caller is from the admin organization.
   • CUse the stub.GetCreator() to get the caller's certificate and parse the role from it.
   • DUse cid.GetID() to check if the caller is the admin user.
   Reveal Solution Discussion Select an answer first
5. 4application · medium

   A developer is writing a chaincode for a healthcare application that stores patient records. The chaincode must ensure that only authorized healthcare providers can read a patient's record. The chaincode uses the Fabric Client Identity (CID) library. What is the most appropriate way to implement this access control?

   • AUse the stub.GetCreator() function to get the caller's certificate and manually parse it.
   • BUse cid.GetAttributeValue() to check if the caller has a 'doctor' attribute.
   • CUse cid.GetID() to check if the caller is the patient themselves.
   • DUse cid.GetMSPID() to check if the caller is from a healthcare provider organization, and allow access if they are.
   Reveal Solution Discussion Select an answer first
6. 5application · medium

   A developer is writing unit tests for a new chaincode function that updates an asset's owner. The function first checks that the caller is the current owner. To test the authorization logic without invoking the chaincode through a peer, what is the most effective approach?

   • AWrite an integration test that submits transactions as different users through the Fabric SDK.
   • BAdd logging statements to the chaincode and manually inspect the logs after running a transaction.
   • CDeploy the chaincode to a test network and use the peer CLI to invoke the function as different identities.
   • DUse the ChaincodeStubInterface mock to set the caller's identity and verify that the function returns an error for unauthorized callers.
   Reveal Solution Discussion Select an answer first