How do columnar databases compare to specialized NoSQL databases for handling unstructured data? What are the key considerations for migrating data from a row-oriented database to a columnar database?

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what is columnar database Informational

• How does columnar storage affect data visualization?
• Explain the role of bloom filters in columnar databases. How do zone maps improve query performance in columnar databases?
• How can columnar databases help ensure data accuracy and consistency?
• How can data be migrated from a row-oriented database to a columnar database with minimal downtime?
• How do columnar databases integrate with ETL/ELT processes? Describe the different data encoding techniques used in columnar databases.
• Discuss the use of techniques like optimistic and pessimistic concurrency control in columnar databases. How do columnar databases handle schema evolution and changes over time?
• Discuss different strategies for performing schema changes in a columnar database with minimal downtime.
• How does columnar storage improve query performance for analytical workloads?
• Discuss the potential impact of new hardware innovations (e.g., NVMe, persistent memory) on columnar database design.
• Explain how data lineage and data profiling can be performed on columnar data.