CBDH sample questions

Question 1

A developer is troubleshooting a slow-performing chaincode query that uses a complex selector to find assets based on multiple JSON attributes. The underlying state database is CouchDB. What is the most effective way to improve the performance of this query?
```mermaid
graph TD
ClientApp -- query('{"selector":{"owner":"Alice", "color":"blue"}}') --> Peer
Peer -- GetQueryResult --> Chaincode
Chaincode -- CouchDB Mango Query --> CouchDB
subgraph CouchDB
direction LR
DB_Scan[Full DB Scan] --> SlowResponse{Slow Response}
end
CouchDB --> Chaincode
Chaincode --> Peer
Peer --> ClientApp
```

Accepted Answer

Define a CouchDB index for the queried fields and package it with the chaincode.

Answer

Increase the memory and CPU allocated to the peer's Docker container.

Answer

Switch the state database from CouchDB to LevelDB.

Answer

Use `GetStateByRange` instead of `GetQueryResult` to paginate the results.

Question 2

Level DB is the default database for Hyperledger Fabric and is particularly appropriate when ledger states comprise what type of data?

Accepted Answer

Simple key-value pairs

Answer

Complex key-value pairs

Answer

Rich Queries

Answer

JSON data pairs

Question 3

When creating a network according to an organization's structure and also bootstrap a channel what are the following artifacts we would need to generate?

Accepted Answer

Genesis Block, Channel Configuration and Anchor Peer Configs for each organization.

Answer

Genesis Block, License File and Anchor Peer Configs for each organization.

Answer

Genesis Block, ledger Configuration and Anchor Peer Configs for each organization.

Answer

Genesis Block, Channel Configuration and Anchor MSP Configs for each organization.

Question 4

Which Hyperledger tool would you select to invoke, deploy or query blocks, transactions and associated data, network information (name, status, list of nodes), chain codes and transaction families, as well as other relevant information stored in the ledger?

Accepted Answer

Hyperledger Explorer

Answer

Hyperledger Quilt

Answer

Hyperledger Cello

Answer

Hyperledger Caliper

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Free CBDH sample questions

Level DB is the default database for Hyperledger Fabric and is particularly appropriate when ledger states comprise what type of data?

When creating a network according to an organization's structure and also bootstrap a channel what are the following artifacts we would need to generate?

Which Hyperledger tool would you select to invoke, deploy or query blocks, transactions and associated data, network information (name, status, list of nodes), chain codes and transaction families, as well as other relevant information stored in the ledger?

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