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Performance Monitoring & Optimization Flashcards

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Read the first 7 Performance Monitoring & Optimization flashcards as text

  1. Which state database choice generally gives faster simple key lookups but no rich queries?

    Answer: LevelDB

    LevelDB is embedded and fast for key and range operations but does not support JSON rich queries.

  2. Where should CouchDB index definitions be packaged in a Go chaincode so they deploy automatically?

    Answer: META-INF/statedb/couchdb/indexes

    Index JSON files placed in META-INF/statedb/couchdb/indexes are installed with the chaincode package.

  3. Why are key-range queries preferred over rich queries when possible?

    Answer: They efficiently scan keys and are re-validated at commit, unlike rich query results

    Range queries are cheaper and their results are re-checked for phantom reads at validation, while rich queries are not.

  4. What is the purpose of GetQueryResultWithPagination?

    Answer: Limit the number of results returned per call to bound resource use

    Pagination returns a page of results with a bookmark, preventing huge result sets.

  5. Many transactions update a single counter key and most fail with MVCC_READ_CONFLICT. What design change helps?

    Answer: Store each update under a unique composite key and aggregate on read

    Writing separate delta keys avoids multiple transactions in a block contending for one key version.

  6. What is a performance and operational benefit of chaincode-as-an-external-service?

    Answer: The peer does not build or launch chaincode containers via Docker

    External chaincode runs as a service the peer connects to, avoiding peer-managed Docker builds and launches.

  7. Which peer setting bounds how long a chaincode invocation can run before it is aborted?

    Answer: chaincode.executetimeout

    chaincode.executetimeout in core.yaml sets the invocation timeout, 30s by default.

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Sources & references

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  1. blockchaintrainingalliance.com — Test delivery, passing score, score release, test dates, fees, exam format, time limit · verified Oct 2026