Where are models stored when you develop a business network application model on Playground?
The ledger system in Hyperledger Fabric uses what database by default?
The ledger system in Hyperledger fabric uses levelDB. By definition, LevelDB allows concurrent writers to safely insert data into the database by providing internal synchronization. LevelDB uses very coarse-grained synchronization which forces all writes to proceed in an ordered, first-come-first-served basis, effectively reduces throughput to a single thread. State database options include LevelDB and CouchDB. LevelDB is the default key-value state database embedded in the peer process. CouchDB is an optional alternative external state database. Like the LevelDB key-value store, CouchDB can store any binary data that is modeled in chaincode (CouchDB attachment functionality is used internally for non-JSON binary data). But as a JSON document store, CouchDB additionally enables rich query against the chaincode data, when chaincode values (e.g. assets) are modeled as JSON data
You are starting to understand the needed package dependencies for chaincode. What are the two required packages? (Select two.)
What is provided by the Hyperledger Fabric to facilitate network communications?
Hyperledger Fabric provides a Node.js and a Java SDK to facilitate network communications functionality.
Chaincode interface must be implemented by ever chaincode program.
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