Chaincode Development, Deployment, and Lifecycle Management BDC Practice Questions (Page 5)

Questions 21–25

1. 21expert · hard

   A chaincode function is called frequently and performs a large number of GetState calls to read multiple assets. The function is experiencing high latency. The developer wants to optimize the function without changing the business logic. Which approach is most effective?

   • AUse the GetQueryResult function with a rich query to retrieve only the needed assets.
   • BUse the GetPrivateData function to store frequently accessed data in private data collections.
   • CUse the GetStateByRange function to retrieve all assets in a single call instead of multiple GetState calls.
   • DUse the GetStateByPartialCompositeKey function to retrieve assets with a common prefix in one call.
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2. 22application · medium

   A chaincode running on a production Fabric channel needs to be upgraded to fix a critical bug. The network has multiple organizations, and the endorsement policy is set to require a majority of organizations. What must the administrator do to ensure the upgrade is accepted by the network?

   • AInstall the new chaincode version on one peer and then invoke the upgrade transaction on the channel.
   • BSubmit a channel configuration update to change the chaincode version directly.
   • CStop the old chaincode container and restart it with the new code.
   • DPackage the new chaincode version, install it on all peers, and obtain approval from enough organizations to satisfy the endorsement policy.
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4. 23foundation · easy

   What is the role of an endorsement policy in Hyperledger Fabric?

   • AIt controls which users can invoke the chaincode
   • BIt determines the order in which transactions are added to the ledger
   • CIt specifies which organizations' peers must endorse a transaction for it to be considered valid
   • DIt defines the data schema for the chaincode's state
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5. 24application · medium

   A developer is writing a chaincode function that processes a batch of transactions. The function is supposed to be atomic: if any transaction in the batch fails, the entire batch should be rolled back. The developer is using the PutState function to update the state. What is the correct way to achieve atomicity?

   • AUse the stub.DelState to delete the changes if any transaction fails.
   • BUse the stub.SetEvent to emit an event and rely on the event to trigger a rollback.
   • CUse the stub.GetState to check the current state before each PutState and revert if any fails.
   • DUse the stub.PutState for each transaction and if any fails, return an error from the chaincode function.
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6. 25foundation · easy

   When designing chaincode for performance, what is a recommended approach for querying data?

   • AUsing the GetStateByRange function without limits
   • BUsing rich queries with appropriate indexes to retrieve only necessary data
   • CAvoiding queries altogether and storing all data in a single key
   • DRetrieving all records and filtering them in the chaincode
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